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- W2313018422 abstract "The effect of branching and modification of end group of poly (ethylene terephthalate) (PET) on the molecular orientation and crystallization during melt spinning and heat treatment of the fiber was studied by X-ray diffraction and birefringence measurements. The modified polyesters were prepared by adding pentaerythrithol (PENTA) as a branching agent and monomethoxy polyethyleneglycol (MPEG: average molecular weight=1500) as an end modifier in the polycondensation system of PET. As a result, it was observed that the molecular orientation of the branched PET fiber was much greater than that of linear PET and MPEG in the modified PET had a relaxation effect on the molecular orientation. In the extreme case of the orientation at the spinning velocity of 1250 m/min, X-ray photograph of the fiber showed the coexistence of fiber-axis oriented crystallites in almost isotropic amorphous matrix. These results suggest that the molecular chains of branched polymer tend to orient to the extent much greater than those of linear polymer due to intermolecular entanglements of the branched chains, and the molecular orientation results in the localized crystallization. When as-spun amorphous fibers of branched PET (PENTA containing) were heat treated, tilt preferred orientation of the crystallites was observed depending on the spinning draft. These behavior of the oriented crystallization can be explained by assuming the existence of oriented crystalline nuclei generated by the orientation effect of the chain branching." @default.
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- W2313018422 date "1980-01-01" @default.
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- W2313018422 title "ORIENTATION BEHAVIOR OF BRANCHED POLY (ETHYLENE TEREPHTHALATE) IN MELT SPINNING PROCESS" @default.
- W2313018422 doi "https://doi.org/10.2115/fiber.36.8_t319" @default.
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