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首页> 外文期刊>Journal of Applied Polymer Science >Effect of composition and molecular structure on the LC phase of PHB-PEN-PET ternary blend
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Effect of composition and molecular structure on the LC phase of PHB-PEN-PET ternary blend

机译：组成和分子结构对PHB-PEN-PET三元共混物LC相的影响

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摘要

Poly(p-hydroxybenzoic acid) (PHB)-poly(ethylene terephthalate) (PET) 8/2 thermotropic liquid crystalline copolyester, poly(ethylene 2,6-naphthalate) (PEN), and PET were mechanically blended to pursue the liquid crystalline (LC) phase of ternary blends. The torque values of blends with increasing PHB content abruptly decreased above 40 wt % of PHB content because the melt viscosity of ternary blends dropped. Glass transition temperature and melting temperature of blends increased with increasing PHB content. The tensile strength and initial modulus of blends were low at 10 and 20 wt % PHB. However, the blends containing above 30 wt % PHB were improved with increasing PHB content due to the formation of fibrous structure. The blend of 20 wt % PHB formed irregularly dispersed spherical domains, and the blends of 30-40 wt % PHB showed LCP ellipsoidal domains and fibrils. In the polarized optical photographs, the blends of 40 wt % PHB showed pseudo LC phases. The degree of transesterification and randomness of blends were increased with blending time. (C) 1998 John Wiley & Sons, Inc. [References: 18]
机译：将聚对羟基苯甲酸（PHB）-聚对苯二甲酸乙二酯（PET）8/2热致性液晶共聚酯，聚2,6-萘二甲酸乙二酯（PEN）和PET机械混合以形成液晶（LC）三元混合物。随着PHB含量的增加，共混物的扭矩值突然降低至PHB含量的40重量％以上，这是因为三元共混物的熔体粘度下降。共混物的玻璃化转变温度和熔融温度随着PHB含量的增加而增加。共混物的拉伸强度和初始模量在PHB为10和20重量％时较低。然而，由于纤维结构的形成，随着PHB含量的增加，含有高于30wt％PHB的共混物得到改善。 20 wt％PHB的共混物形成不规则分散的球形区域，而30-40 wt％PHB的共混物显示LCP椭圆形区域和原纤维。在偏振光学照片中，40 wt％PHB的混合物显示出伪LC相。共混的酯交换度和无规度随共混时间的增加而增加。 （C）1998 John Wiley＆Sons，Inc. [参考：18]

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