Tag: M.W=600-700

Cai, Jiawen published the artcileA Physical-chemical Synergetic Inhibitor for Coal Spontaneous Combustion and Its Fire Prevention Performance, Quality Control of 31570-04-4, the publication is Combustion Science and Technology (2022), 194(6), 1155-1167, database is CAplus.

A single phys. or chem. inhibitor can hardly meet the uttermost requirements for coal spontaneous combustion prevention. Therefore, it has become essential to develop an efficient inhibitor with multiple inhibitory properties. In light of studies on the properties of the super absorbent polymer (SAP), the main antioxidant pentaerythritol tetrakys 3-(3,5-ditert-butyl-4-hydroxyphenyl) propionate and auxiliary antioxidant tris (2,4-di-tert-butyl-pheny) phosphite, a synergistic antioxidant with both phys. and chem. inhibitory properties was prepared According to the determination of volatile matter and calorific value of coal, the optimum molar ratio of the compound antioxidant (main antioxidant: auxiliary antioxidant = 2:1) was selected. Furthermore, the optimum formulation ratio (SAP: antioxidant = 1:3) and the optimum mass ratio (12%) were determined, taking the low-temperature oxygen consumption and cross-point temperature (CPT) of coal as indexes. Three grades of metamorphic coal were selected to obtain the gaseous product, oxygen consumption at 70°C, CPTs and inhibition rate. The addition inhibitor reduced the release of CO and C₂H₄ gas and oxygen consumption, while it raised CPTs and inhibition rate of coal oxidation The inhibiting capacity of MgCl₂ is mainly at low-temperature stage, while the synergistic inhibitor has excellent congenerous phys. and chem. effect in the whole coal oxidation process.

Combustion Science and Technology published new progress about 31570-04-4. 31570-04-4 belongs to esters-buliding-blocks, auxiliary class Mono-phosphine Ligands, name is Tris(2,4-di-tert-butylphenyl) phosphite, and the molecular formula is C42H63O3P, Quality Control of 31570-04-4.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Tan, Hongli published the artcile“Novel” Synthetic Antioxidants in House Dust from Multiple Locations in the Asia-Pacific Region and the United States, SDS of cas: 31570-04-4, the publication is Environmental Science & Technology (2021), 55(13), 8675-8682, database is CAplus and MEDLINE.

Synthetic antioxidants represent a complex group of additive chems. broadly used in consumer products. While traditional antioxidants such as 2,6-di-tert-butyl-4-methylphenol (BHT) were well studied, a variety of “novel” antioxidants have emerged with extensive applications but received much less attention. Our study aimed to explore a suite of 34 emerging antioxidants in house dust from four different regions, including Guangzhou (China), Adelaide (Australia), Carbondale (Illinois), and Hanoi (Vietnam). The results revealed broad occurrence of several rarely investigated chems. in house dust across regions, including triethylene glycol bis(3-tert-butyl-4-hydroxy-5-methylphenyl)propionate (AO245), 2,6-di-tert-butyl-4-(dimethylamino)methylphenol (AO4703), 2,2′-thiene-2,5-diylbis(5-tert-butyl-1,3-benzoxazole) (BBOT), 1,3-diphenylguanidine (DPG), 2,4-bis(1,1-dimethylethyl)phenol (2,4DtBP), and 2,6-bis(1,1-dimethylethyl)phenol (2,6DtBP). In particular, DPG exhibited a median concentration of 5030-11 400 ng/g in house dust from the studied regions except for Hanoi (305 ng/g), generally 1 order of magnitude greater than that of BHT (890-1060 ng/g) and dominating the compositional profiles of antioxidants. Estimated intake of target antioxidants by toddlers via dust ingestion, even under the high exposure scenario, was determined to be 2-4 orders of magnitude lower than the reference doses of selected antioxidants. However, potential risks from long-term exposure to a cocktail of antioxidants under environmentally relevant concentrations merit further investigations due to insufficient knowledge on the sources, fate, and toxicokinetics of these chems. to date.

Environmental Science & Technology published new progress about 31570-04-4. 31570-04-4 belongs to esters-buliding-blocks, auxiliary class Mono-phosphine Ligands, name is Tris(2,4-di-tert-butylphenyl) phosphite, and the molecular formula is C25H23NO4, SDS of cas: 31570-04-4.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Phulkerd, Panitha published the artcileEffect of molecular weight on molecular orientation and morphology of polypropylene sheets containing a β-nucleating agent, Safety of Tris(2,4-di-tert-butylphenyl) phosphite, the publication is Polymer Engineering & Science (2021), 61(2), 367-378, database is CAplus.

In this study, polypropylene (PP) films containing the β nucleating agent, N,N’-dicyclohexyl-2,6-naphthalenedicarboxamide, were prepared using PP with three different mol. weights (low, medium, and high) by extrusion process with T-shaped die. The structure and morphol. of the films were studied after stretching. It was found that a unique mol. orientation, in which both the c-axis and crystalline lamellae were oriented perpendicular to the flow direction, was formed in all undrawn film samples, irresp. of the mol. weights of the PP. In the PP sheets stretched in the machine direction, the low-mol.-weight sample containing the nucleating agent exhibited brittle properties owing to a lack of tie chains in the stretching direction. In contrast, cavitation was prominent in the medium (M-PP)- and high (H-PP)-mol.-weight samples. Notably, M-PP containing the nucleating agent, with a high degree of mol. orientation, promoted the formation of a large number of voids. In H-PP containing the nucleating agent, the presence of numerous tie chains inhibited cavitation, resulting in fewer voids. The exptl. results demonstrated the influence of the mol. weight on the void structure, which will be useful in the field of microporous membranes.

Polymer Engineering & Science published new progress about 31570-04-4. 31570-04-4 belongs to esters-buliding-blocks, auxiliary class Mono-phosphine Ligands, name is Tris(2,4-di-tert-butylphenyl) phosphite, and the molecular formula is C42H63O3P, Safety of Tris(2,4-di-tert-butylphenyl) phosphite.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Xu, Haoyu published the artcilePolycarbonate blends with high environmental stress crack resistance, high strength and high toughness by introducing polyvinyl butyral at small fraction, Related Products of esters-buliding-blocks, the publication is Polymer (2022), 124578, database is CAplus.

It is of great importance to prepare polycarbonate (PC) with high environmental stress crack resistance (ESCR), high strength and high toughness by melting blend. In this work, by incorporating small fraction of PVB, a com. available engineering plastics with excellent flexibility at high temperature, PC/PVB blends with obviously improved ESCR are obtained. The enhanced ESCR is mainly ascribed to the decreased internal stress due to the low T_g and flexibility of PVB. On one hand, the low T_g and flexibility make PVB deformable during cooling to release the tension force of PC which results from the different cooling rate between surface and internal. On the other hand, the low T_g and flexibility of PVB can promote the motion of PC chains and decrease the viscosity of PC fusant to weaken the orientation force. Besides, without adding any compatibilizer, PC/PVB blends well maintain the high strength and toughness of PC due to the uniform dispersion of PVB and excellent mech. properties of PVB at room temperature We envision that this work offers an alternative facile method to prepare PC blends with high environmental stress crack resistance, high strength and high toughness and will promote the wide application of PC.

Polymer published new progress about 31570-04-4. 31570-04-4 belongs to esters-buliding-blocks, auxiliary class Mono-phosphine Ligands, name is Tris(2,4-di-tert-butylphenyl) phosphite, and the molecular formula is C13H9FO2, Related Products of esters-buliding-blocks.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Sun, Weilong published the artcileUltrahigh Molecular Weight Polyethylene Lamellar-Thin Framework on Square Meter Scale, SDS of cas: 31570-04-4, the publication is Advanced Materials (Weinheim, Germany), database is CAplus and MEDLINE.

A new member of low-dimensional structures with a high aspect ratio (LDHA) is introduced. For the first time, commodity polymer is processed into LDHA, which has long been stagnated by the lack of suitable processing techniques. The key to solve the current bottleneck is to overcome the trade-off between kinetic processability and thermodn. stability. These two factors are both highly determined by intermol. interaction level (IIL). Thus with a wide tuning range of IIL, ultrahigh mol. weight polyethylene (UHMWPE) is selected and investigated to break through the trade-off. Polymeric LDHA preparation needs both thinning and stiffening. By focusing on one then the other sequentially, they are realized simultaneously. Thus the over sixty-year-old material is finally thinned down by seven orders of magnitude into a 65.5 nm thick and 0.64 m² large lamellar-thin framework (LTF). LTF exhibits a series of exceptional properties such as over-95% transparency, and seven times higher specific strength referred to steel. For the first time, cryogenic electron microscopy (Cryo-EM) is utilized to observe commodity polymers directly. This new LDHA material is promising to expand the scale boundaries of both fundamental research and practical applications, not only for UHMWPE, but also for more commodity polymers to come.

Advanced Materials (Weinheim, Germany) published new progress about 31570-04-4. 31570-04-4 belongs to esters-buliding-blocks, auxiliary class Mono-phosphine Ligands, name is Tris(2,4-di-tert-butylphenyl) phosphite, and the molecular formula is C12H10F2Si, SDS of cas: 31570-04-4.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Zhou, Hui published the artcileThe nucleation mechanism of 1-N’,3-N’-dibenzoylbenzene-1,4-dicarbohydrazide as a nucleating agent for isotactic polypropylene, Category: esters-buliding-blocks, the publication is Journal of Polymer Research (2022), 29(7), 283, database is CAplus.

A novel nucleating agent (NA) 1-N’,3-N’-dibenzoylbenzene-1,4-dicarbohydrazide (PTADH-Ph-3) for isotactic polypropylene (iPP) was synthesized and the structure of the synthesized product was characterized by Fourier transform IR spectroscopy (FT-IR), proton NMR spectroscopy (1H-NMR) and high resolution mass spectrometry (HRMS). The results showed that the target compound was successfully synthesized. Differential scanning calorimeter (DSC) was used to study the influence of the addition concentration of PTADH-Ph-3 and the final heating temperature (T_f) on the crystallization behavior of iPP. The results showed that the crystallization behavior of nucleated iPP had no relationship with T_f no matter how much PTADH-Ph-3 was added. This shows that PTADH-Ph-3 is not a solution-type NA, so its nucleation mechanism belongs to the traditional heterogeneous crystallization The nucleation mechanism of PTADH-Ph-3 in iPP was explored through Materials Studio (MS) simulation. Firstly, the mol. dynamics (MD) of PTADH-Ph-3 and iPP were calculated mainly by MS. The calculation results showed that the interaction force between PTADH-Ph-3 and iPP mols. was 14.447 kcal mol^-1, indicating that PTADH-Ph-3 has a better adsorption effect on the iPP surface, which can promote the epitaxial crystallization of iPP. The calculated results show that the lattice mismatch between PTADH-Ph-3 and iPP is only 0.03% and 2.28%, which is far lower than the strict upper limit of 10-15% geometric mismatch in the crystal lattice matching theory.

Journal of Polymer Research published new progress about 31570-04-4. 31570-04-4 belongs to esters-buliding-blocks, auxiliary class Mono-phosphine Ligands, name is Tris(2,4-di-tert-butylphenyl) phosphite, and the molecular formula is C8H8O3, Category: esters-buliding-blocks.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Wang, Yini published the artcileMigration of polymer additives and radiolysis products from irradiated PET/PE films into a food simulant, Formula: C42H63O3P, the publication is Food Control (2021), 107886, database is CAplus.

The com. application of food irradiation has raised increasing concern regarding the migration of chem. hazards from irradiated food packaging materials which may threaten food safety and human health. In this study, polymer additives and radiolysis products that migrated from irradiated PET/PE films into a fatty food simulant (95% ethanol) were identified using a UHPLC-QTOF/MS method. Based on the identification results, six additives were selected and their migration behaviors were evaluated under the effect of gamma and electron beam irradiation at a dose of 10 kGy. No significant change in migration levels was observed after irradiation treatment in additives with superior resistance to irradiation (e.g., fatty acid amides). Migration levels of additives vulnerable to irradiation (e.g., antioxidants and disubstituted glycerides) exhibited a decrease, which varied between the different types of irradiation treatments. Decrease in the concentration of phosphite antioxidant (Irgafos 168) was associated with increase in the concentration of its oxidized product (Irgafos 168-ox) that was induced by irradiation In addition, migration levels of additives were affected by partitioning between the polymer and the food simulant. A high migration level was observed in antioxidants that were predominantly present in the food simulant (due to migration) rather than in the polymer before irradiation treatment. The findings of the present study provide insights into future studies on chem. migration from packaging materials into irradiated food.

Food Control published new progress about 31570-04-4. 31570-04-4 belongs to esters-buliding-blocks, auxiliary class Mono-phosphine Ligands, name is Tris(2,4-di-tert-butylphenyl) phosphite, and the molecular formula is C8H7NO4, Formula: C42H63O3P.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Yan, Shengdi published the artcileThermo-induced chain scission and oxidation of isosorbide-based polycarbonates: Degradation mechanism and stabilization strategies, Computed Properties of 31570-04-4, the publication is Polymer Degradation and Stability (2022), 110028, database is CAplus.

The thermal degradation mechanism and stabilization strategies of isosorbide (ISB)-co-1,4-cyclohexanedimethanol (CHDM) polycarbonate (IcC-PC) and IcC-PC/bisphenol-A polycarbonate (BPA-PC) blends were systematically investigated. IcC-PC is more prone to mol. weight decrease and yellowing than BPA-PC during high-temperature processing. MALDI-TOF-MS and ¹H-NMR anal. results show that ISB-PC and CHDM-PC underwent hydrolysis, β-elimination, and ISB-unit oxidation reactions, in which the former two reactions reduced mol. weight, and the latter induced yellowing. The addition of phosphite antioxidants, which have a strong peroxide removal ability, and free radical scavengers with low steric hindrance can inhibit the hydrolysis and ISB-unit oxidation Accordingly, the thermal stability of IcC-PC is significantly improved. By reducing the reaction time (even if the catalysts loading is increased) and adding antioxidants, the thermal stability of reactive blends can be further improved, and the IcC-PC/BPA-PC transparent alloys close to the PC raw materials were prepared

Polymer Degradation and Stability published new progress about 31570-04-4. 31570-04-4 belongs to esters-buliding-blocks, auxiliary class Mono-phosphine Ligands, name is Tris(2,4-di-tert-butylphenyl) phosphite, and the molecular formula is C17H37NO3, Computed Properties of 31570-04-4.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Yan, Shengdi published the artcileHydrolytic degradation of isosorbide-based polycarbonates: Effects of terminal groups, additives, and residue catalysts, Computed Properties of 31570-04-4, the publication is Polymer Degradation and Stability (2021), 109703, database is CAplus.

The hydrolysis degradation of bisphenol-A polycarbonate (BPA-PC), isosorbide (ISB)-co-1,4-cyclohexanedimethanol (CHDM) polycarbonate (IcC-PC), and BPA-PC/IcC-PC reactive blends were systematically investigated. The terminal hydroxyl groups of BPA-PC, thermally derived chem. structure on IcC-PC chains, and derivatives from phosphite antioxidants trigger severe hydrolysis degradation 1H-NMR anal. shows that carbonate groups connected to the BPA unit are most susceptible to hydrolysis, followed by ISB and CHDM units, demonstrating that the acidity of monomers plays a key role in the hydrolysis degradation of polycarbonates. Residual catalysts may cause significant hydrolysis in BPA-PC/IcC-PC reactive blends. Hydrolysis prefers to occur on the exo position of ISB unit with a low steric hindrance rather than on the endo position with a high electrophilicity, indicating that the residual catalyst acts as a Lewis acid and likely promotes hydrolysis through coordination mechanism. The hydrolysis resistance of BPA-PC/IcC-PC blends with a Na-based catalyst is lower than that of blends with K- and Cs-based catalysts because of the strong coordination ability.

Polymer Degradation and Stability published new progress about 31570-04-4. 31570-04-4 belongs to esters-buliding-blocks, auxiliary class Mono-phosphine Ligands, name is Tris(2,4-di-tert-butylphenyl) phosphite, and the molecular formula is C7H5Cl2NO2, Computed Properties of 31570-04-4.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Wu, Nan published the artcileRelationships of the Degree of C=C Double Bond Conversion with the Dielectric Properties for SiO₂/1,2-PB/SBS/EPDM Composites Cured by Organic Peroxide, Product Details of C42H63O3P, the publication is ChemistrySelect (2022), 7(3), e202104078, database is CAplus.

Polymer materials with low dielec. constant and dielec. loss play an indispensable role in high speed and stable signal transmission of electronic components. In this work, the SiO₂/ 1,2-polybutadiene/ styrene-butadiene-styrene triblock copolymer/ ethylene-propylene-diene terpolymer (SiO₂/1,2-PB/SBS/EPDM) composites were prepared with different content of organic peroxide (bis (1-(tert-Bu peroxide)-1-Me ethyl)-benzene, BIPB). A high degree of crosslinking reaction may occur during the curing process. Attenuation total reflectance Fourier transformation IR spectrometry (ATR-FTIR) anal. showed that the degree of C=C conversion (DC) increased with the increase of BIPB content, and the dielec. constant of the composites was reduced. However, the dielec. loss decreased initially and subsequently increased. The excess initiators transform into impurities and increase the polarization and conductivity, resulting in a larger dielec. loss value of the composite. The combined results show that the DC value of 92.76%, the dielec. constant of 3.37 and the dielec. loss of 0.0028 were obtained for the SiO₂/1,2-PB/SBS/EPDM composites containing 3 part-by-weight (pbw) BIPB. Furthermore, the composite had good thermal stability and superior mech. properties.

ChemistrySelect published new progress about 31570-04-4. 31570-04-4 belongs to esters-buliding-blocks, auxiliary class Mono-phosphine Ligands, name is Tris(2,4-di-tert-butylphenyl) phosphite, and the molecular formula is C17H18N2O6, Product Details of C42H63O3P.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics