Category: 31570-04-4

Schweighuber, Andrea published the artcileInvestigations on the influence of multiple extrusion on the degradation of polyolefins, Category: esters-buliding-blocks, the publication is Polymer Degradation and Stability (2021), 109689, database is CAplus.

The importance of mech. recycling of polymers has increased within the last decades, especially due to numerous regulations of governments all over the world. Hereby recycling quotas are enforced to pave the way towards a closed loop recycling. During its lifetime, polymers are exposed to multiple environmental factors, which can already induce degradation However, a major factor that needs to be taken into account is the increased thermo-mech. stress during the recycling process, which may have significant impact on the quality of recyclates as well. In the present work, polyolefins (high-d. polyethylene and polypropylene) were artificially exposed to stress by continuous extrusion at varying speeds and absence or presence of stabilizers to analyze the extent to which the recycling contributes to degradation processes. These samples were analyzed for low-mol.-weight stress markers by thermodesorption gas chromatog. and by high-performance liquid chromatog. (both coupled to mass spectrometric detection). Depending on the extent of stress, the occurrence of odd-numbered linear alkane chains was revealed in polyethylene samples, and of oxidized branched alkanes in polypropylene samples. Correlations with mol. weight (determined by high temperature gel permeation chromatog.) and with decreasing concentrations of stabilizers could be demonstrated.

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 C12H13NO3, Category: esters-buliding-blocks.

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

Li, Xingzhen published the artcileThe structure and performance study of PP random impact resistance copolymer, Product Details of C42H63O3P, the publication is Polymer Bulletin (Heidelberg, Germany), database is CAplus.

Four samples, including homopolymerized PP (PP-1), random impact copolymerized PP (PP-2), random impact copolymerized PP of ethylene-propylene (PP-3), and random impact copolymerized PP of ethylene-propylene-butylene (PP-4), which were prepared by 75 KG Spheripol process pilot plant using ZN104M as catalyst, were adopted to study the structure and performance, i.e., the influence of the different polypropylene mol. chain structures on the crystallization behavior of random impact copolymer polypropylene, and the changes in mech. and optical performance due to the different aggregation structures of random impact copolymer polypropylene, and following results were achieved. Firstly, when ethylene-propylene rubber (EPR) and copolymerization monomers of ethylene and butylene were added in turn, the regularity of PP mol. chains decreased in different degree with the order of PP-1 > PP-2 > PP-3 > PP-4, and which further led to the same pattern for the crystallization peak temperature and the crystallinity. Secondly, half-crystallization time (T_1/2) of the same cooling rate and the crystallization activation energy increased with the addition of EPR, ethylene and butylene. Crystallization activation energies were calculated to be 12.05 kJ mol^-1, 12.09 kJ mol^-1, 12.38 kJ mol^-1 and 12.64 kJ mol^-1 for PP-1, PP-2, PP-3 and PP-4, resp. Last but the most importantly, the addition of EPR, ethylene and butylene would enhance the impact strength, but decrease the transmittance, whereas the haze changed little. Based on the theory between structure and performance, the reason that caused above results were analyzed. This work provided some guidance for the development of high-performance polypropylene used in identical fields.

Polymer Bulletin (Heidelberg, 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 C42H63O3P, Product Details of C42H63O3P.

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

Nishikawa, Riho published the artcileCrystallinity enhancement of extruded polypropylene containing poly(vinyl alcohol) fibers prepared in situ, Safety of Tris(2,4-di-tert-butylphenyl) phosphite, the publication is Polymer (2022), 125043, database is CAplus.

The present paper describes a novel method for reinforcing isotactic polypropylene (PP) by adding poly(vinyl alc.) (PVA) fibers prepared by melt-stretching. Low-viscosity PVA droplets were deformed into fibers in the molten PP by melt-stretching them beyond the m.p. of PVA. When the obtained composite was extruded below the m.p. of PVA, the fibers became oriented toward the flow direction. The PVA demonstrated marked nucleating activity with regard to PP crystallization, which was further promoted by enlargement of the surface area by fibrillization. As a result, there was virtually no orientation relaxation of the PP chains with an increase in crystallinity, which explains the improvement in rigidity of the reinforced composite.

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 C42H63O3P, Safety of Tris(2,4-di-tert-butylphenyl) phosphite.

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

Liu, Zhipeng published the artcileMechanism of boron carbide particles improving the wear resistance of UHMWPE: Structure-property relationship, Safety of Tris(2,4-di-tert-butylphenyl) phosphite, the publication is Polymer (2022), 124733, database is CAplus.

Inorganic particles are often used to enhance the wear resistance of UHMWPE, but the mechanism of the “enhancement effect” of inorganic particles improving the wear resistance of UHMWPE is ambiguous. In this paper, boron carbide particles(B₄C) were used to improve the wear resistance of UHMWPE, it was found that the wear resistance of UHMWPE was increased by up to 46% with appropriate filler loading of B₄C. Subsequently, the mechanism of B₄C improving the wear resistance of UHMWPE was studied and illustrated from the perspective of structure-property relationship. The B₄C particles act as exotic entanglement points, forming an entanglement network of particle-coupling agent-matrix, improving the degree of entanglement of mol. chains in the amorphous region of UHMWPE, thus improving the shear resistance of the matrix and reducing the structure damage caused by strong shearing during friction. Meanwhile, the highly entangled mol. chains prevented the transition of the interphase to the crystalline region, thus increasing the content of the interphase of UHMWPE and consequently alleviating the structural damage during the friction. Furthermore, B₄C particles played the role of load bearing, which enhanced the compression resistance of UHMWPE then reduced the structure damage caused by compression in the normal upward during friction. This paper could be helpful to better understand the role of fillers on the wear resistance of UHMWPE and provide theor. guidance to improve the wear resistance of UHMWPE and other materials.

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 C42H63O3P, Safety of Tris(2,4-di-tert-butylphenyl) phosphite.

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

Zhang, Yu published the artcileMorphology evolution and mechanical property enhancement of linear low-density polyethylene by adding disentangled ultrahigh molecular weight polyethylene, Related Products of esters-buliding-blocks, the publication is Polymers for Advanced Technologies (2022), 33(4), 1047-1056, database is CAplus.

Ultra-high mol. weight polyethylene (UHMWPE) and linear low-d. polyethylene (LLDPE) with different ratios were melt-blended in an internal mixer. Results of rheol. tests and SEM indicate that the blends are well miscible in the range of small addition amount of UHMWPE. The content of UHMWPE is suggested to be less than 5.0 wt%, to guarantee good compatibility of biphasic blends. Differential scanning calorimetry studies indicate that co-crystallization occurs between UHMWPE and LLDPE. The crystallinity increases with the increase of UHMWPE as a nucleating agent. As a result, an improvement in mech. properties is achieved. When the addition amount of UHMWPE is 5.0 wt%, the impact strength, breaking elongation, Young’s modulus, and tensile strength are significantly increased by 27%, 25%, 75%, and 21% resp.

Polymers for Advanced Technologies 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 C7H7IN2O, Related Products of esters-buliding-blocks.

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

Arantes, Luciano Chaves published the artcilePlastic antioxidants: A family of cocaine cutting agents analyzed by short column gas chromatography-mass spectrometry, Safety of Tris(2,4-di-tert-butylphenyl) phosphite, the publication is Journal of Chromatography A (2022), 463170, database is CAplus and MEDLINE.

Plastic antioxidants (PAOs), which are used in the industry to prevent degradation caused by thermo-mech. or thermo-oxidative conditions, have been found in cocaine products seized by the Civil Police of the Federal District, Brazil, since 2019. In this study, a 4-m short column gas chromatog.-mass spectrometry (GC-MS) qual. method was optimized and validated to detect cocaine, PAOs (antioxidant 168, FOS; antioxidant 1076, NOX; and butylated hydroxytoluene, BHT) and 16 other cutting agents in cocaine base and salt. NOX and FOS are high-boiling-point compounds that are not amenable to the standard GC-MS methods. The method uses a 250 °C split mode injection, final temperature of 280 °C, and a total run time of 16.5 min. PAOs were found in 84.2% of the 38 cocaine base samples and in 21.5% of the 65 cocaine salt samples (mainly NOX); 20 samples that did not contain any cocaine also contained PAOs (30% NOX and 25% FOS). Other cutting agents found in the samples included phenacetin, aminopyrine, and lidocaine in cocaine base; lidocaine, tetracaine, and caffeine in cocaine salt. This is the first report of PAOs detected as cocaine cutting agents and shows another important application of the short column GC-MS method in forensic science that can also be applied in other areas involving these compounds

Journal of Chromatography A 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

Nguyen, Khanh Q. published the artcileEffects of Exposure Conditions on Antioxidant Depletion, Tensile Strength, and Creep Modulus of Corrugated HDPE Pipes Made With or Without Recycled Resins, Related Products of esters-buliding-blocks, the publication is Journal of Polymers and the Environment (2022), 30(9), 3959-3973, database is CAplus.

The service lifetime of corrugated high-d. polyethylene (HDPE) pipes used in transportation infrastructure applications has been the subject of several studies over the years. How factors specific to North American climate conditions-such as freeze/thaw cycles, deicing salts, and abrasion-affect pipe service life have not been addressed. In this study, laboratory accelerated-aging tests were conducted to examine the thermo-oxidative degradation as well as tensile strength and creep modulus of HDPE pipes made with or without recycled resins. Specimens were immersed in saline solution (NaCl), acidic solution (H₂SO₄), alk. solution (NaOH) at 60°C, or in water and exposed to freeze/thaw cycles ranging from – 40 to + 40°C. Measuring the oxidative induction time (OIT) at various time intervals quantified the amounts of antioxidants present in the pipes, revealing that the rate of antioxidant depletion depended on the surrounding environment. The depletion rate was faster in the saline solution and slower in the freeze/thaw cycles. For specimens exposed to freeze/thaw cycles, the depletion was 1.12 to 1.91 lower than in the acidic solution, 1.25 to 2.64 times lower than in the alk. solution, and 1.43 to 3.25 times lower than in saline solution Nevertheless, the HDPE pipes all met the OIT requirements of a min. of 20 min. Furthermore, the one-way anal. of variance (ANOVA) and Tukey’s HSD test indicate that the tensile strength and creep modulus values of the recycled and virgin HDPE pipes were unchanged before and after immersion in the different solutions

Journal of Polymers and the Environment 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, Related Products of esters-buliding-blocks.

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

Medina-Mercado, Ignacio published the artcileGold-Catalyzed Ascorbic Acid-Induced Arylative Carbocyclization of Alkynes with Aryldiazonium Tetrafluoroborates, Category: esters-buliding-blocks, the publication is ACS Catalysis (2021), 11(15), 8968-8977, database is CAplus.

Herein, arylative carbocyclization of alkynes 2-R-4-R¹-C₆H₃XCH₂CCR² (X = O, S, NTs; R = H, I; R¹ = H, OMe, Br, Ph, etc.; R² = n-Bu, Ph, thiophen-2-yl, etc.) catalyzed by gold was described. In this process, Au(I) is oxidized to Au(III) with aryldiazonium tetrafluoroborates R³C₆H₄N₂BF₄ (R³ = 4-NO₂, 3-CN, 4-C(O)OEt, etc.) following a photosensitizer-free and irradiation-free protocol. Ascorbic acid acts as a radical initiator, generating aryl radicals. According to DFT calculations, these radicals are added to Au(I), leading to a Au(II) species that is further oxidized to Au(III) with the assistance of a tetrafluoroborate anion. The overall arylative carbocyclization process is very energetically favorable, transforming arylpropargyl ethers into valuable 3,4-diaryl-2H-chromenes I in a completely regio- and stereoselective fashion. Furthermore, one of the synthesized 3,4-diaryl-2H-chromenes I exhibits polymorphism with marked differences in the color of its crystals, a property that could lead to the development of colored derivatives in the future.

ACS Catalysis 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, Category: esters-buliding-blocks.

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

Ovalle, Cristian published the artcileNanocavitation mechanisms in deformed High Density PolyEthylene (HDPE) using synchrotron radiation NanoTomography, Quality Control of 31570-04-4, the publication is Polymer (2021), 123959, database is CAplus.

The nanocavitation distribution in deformed High D. PolyEthylene (HDPE) was investigated. A flat notched sample of HDPE, deformed under steady crosshead speed up to the end of the stress softening, was observed by classical synchrotron parallel beam microtomog. and magnified holotomog. with a true spatial resolution of 0.7μm and 0.05μm, resp. Image processing, 3D image segmentation and 2D-Fast Fourier Transform, was shown to lead to quantification of void volume fraction and void size distributions. Nanocavitation morphol. and distribution in HDPE reveal to be similar to cavitation mechanisms in other semi-crystalline polymers, but at a different scale. While a slight decrease of the void diameter was seen, from the end of the neck shoulder to the extended neck region, a significant increment of the height was evidenced. Furthermore, the results provide compelling evidence of morphol. transition of cavities within the test sample from an oblate to a prolate geometry.

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 C42H63O3P, Quality Control of 31570-04-4.

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

Wu, Rui published the artcileStructure and performance of hydrogenated styrenic block copolymers/polypropylene/oil ( HSBCs / PP /oil) composites, Formula: C42H63O3P, the publication is Polymers for Advanced Technologies (2021), 32(12), 4755-4764, database is CAplus.

In the past few decades, considerable attention has been paid to the thermoplastic elastomer (TPE). Among them, hydrogenated styrenic block copolymers (HSBCs) have attracted extensive interest because of outstanding ozone resistance, remarkable aging properties, and environmental friendliness. Therefore, theor. and exptl. investigations on the HSBCs/PP/oil composites have been reported many times, but the influence of mol. structure on the structure and properties of composites has yet to be identified. In this study, three HSBCs with different mol. structures were used as the research object to systematically study the effects of their mol. structural differences on the aggregate structure, microstructural, mech., and thermal properties of HSBCs/PP/oil composites. It was found thatthe content of side groups in the mol. chain was the main factor affecting the structure and performance of the HSBCs/PP/oil composites. This research can provide theor. guidance for the mol. design and structural control of the new HSBC, so it has obvious theor. significance and practical value.

Polymers for Advanced Technologies 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 C8H15ClN2, Formula: C42H63O3P.

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