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.
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