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• W2341199482 abstract "Polyester industrial yarn has high tenacity by increasing the degree of orientation and crystallinity via the melt spinning of high-molecular-weight (high-Mw) polymer. Solid-state polymerization (SSP) is very important to get higher Mw; it is composed of a crystallization step, which prevents sticking among the chips, and a polycondensation step at solid state. Spherulites in the chip were observed using polarized optical microscopy (POM) in the crystallization step. We studied the effect of crystallization conditions on spherulite size by SSP and determined that the higher the crystallization temperature, the larger the size and deviation of the spherulite. We also observed relatively uniform sizes in the batch process but various sizes in the continuous process. The latter difference in the size and shape of the spherulite would cause differences in the diffusivity of both the end-group and the byproduct, thus resulting in large deviations in Mw and viscosity. Thus, when the crystallization temperature in the continuous process was reduced by 15 °C to decrease the differences of thermal and physical impact history among chips, the sizes and shapes of spherulites consequently became uniform and the difference of Mw decreased because of the reduced crystallization rate difference among chips by decreased temperature deviation in the crystallization reactor. We could get more uniform polymer with reduced variations of Mw, intrinsic viscosity (IV), and melt viscosity (MV). Finally, the max draw ratio, which represents the drawability in melt spinning, increased from 6.28 to 6.71. It indicated that fluffs in yarn could be reduced, and downstream processabilities such as warping and weaving could be enhanced by increased drawability." @default.
• W2341199482 created "2016-06-24" @default.
• W2341199482 creator A5034673378 @default.
• W2341199482 creator A5054746506 @default.
• W2341199482 date "2015-09-08" @default.
• W2341199482 modified "2023-10-12" @default.
• W2341199482 title "Effect of Crystallization Conditions on Spherulite Size and Melt Spinning Performance of Polyester Industrial Yarn by Solid-State Polymerization" @default.
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• W2341199482 doi "https://doi.org/10.1021/acs.iecr.5b01924" @default.
• W2341199482 hasPublicationYear "2015" @default.
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