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首页> 外文期刊>Polymer: The International Journal for the Science and Technology of Polymers >Fibers spun from poly(ethylene terephthalate) blended with a thermotropic liquid crystalline copolyester with non-coplanar biphenylene units
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Fibers spun from poly(ethylene terephthalate) blended with a thermotropic liquid crystalline copolyester with non-coplanar biphenylene units

机译：由聚对苯二甲酸乙二醇酯纺制的纤维与具有非共面联苯单元的热致液晶共聚酯共混

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摘要

To investigate the potential of a fully aromatic, amorphous thermotropic liquid crystalline polyester (CPHNA60) as the in situ reinforcement component for poly(ethylene terephthalat) (PET) fibers, blends containing up to 10 wt% of CPHNA60 were prepared, characterized and spun into fibers. DSC measurements of the blends revealed a nucleating effect of CPHNA60 and rheology investigations showed a decreased melt viscosity even at 0.5 wt% CPHNA60 content. Blend fibers were spun at temperatures between 270 and 290 deg C and successively cold and hot drawn. As-spun fibers showed an increase in Young's modulus with increasing CPHNA60 content to 5.8 Gpa at 10 wt%. After a two stage drawing process, moduli up to 22.6 Gpa at 3 wt% load level were measured while maintaining ultimate strength values around 1 Gpa. This correlates to an increase in modulus of 22%. SEM experiments of as-spun fiber fracture surfaces showed uniformly dispersed CPHNA60 fibrils within the PET matrix with aspect ratios around L/D = 25.
机译：为了研究完全芳族，无定形的热致液晶聚酯（CPHNA60）作为聚对苯二甲酸乙二醇酯（PET）纤维的原位增强组分的潜力，制备了包含，含量高达10 wt％的CPHNA60的共混物，进行了表征和纺丝成纤维。共混物的DSC测量显示出CPHNA60的成核作用，流变学研究显示即使在0.5重量％的CPHNA60含量下熔体粘度也降低。共混纤维在270到290摄氏度之间旋转，并依次冷热拉伸。初生纤维显示出杨氏模量随CPHNA60含量的增加而增加，在10 wt％时为5.8 Gpa。经过两阶段的拉伸过程，在保持3 wt％的负载水平的同时，将最终强度值保持在1 Gpa左右，测量了高达22.6 Gpa的模量。这与模量增加22％相关。初生纤维断裂表面的SEM实验表明，PET基质内的CPHNA60原纤维均匀分散，长径比约为L / D = 25。

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