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首页> 外文期刊>Journal of Applied Polymer Science >Mechanical ,Morphological,and Thermal Properties of Poly(ethylene 2,6-naphthalate)and Copolyester LCP Blends
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Mechanical ,Morphological,and Thermal Properties of Poly(ethylene 2,6-naphthalate)and Copolyester LCP Blends

机译：聚2,6-萘二甲酸乙二醇酯和共聚酯LCP共混物的机械，形态和热性能

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Binary blends of a liquid crystallina polymer (LCP)and poly(ethylene 2,6-naphthalate) (PEN) were melt blended and injection molded .The mechanical properties were studied as a function of LCP content.Both the ultimate tensile strength and Young's modulus are higher than the theoretical values predicted by the rule of mixtures and they display a synergistic behavior at 70 wt % LCP content .However ,the tensile strength decreases with LCP contents(10 to 30 wt %).The poor mechanical property is attributed to the immiscibility between PEN and the fibrillation behavior of LCP as revealed by differential scanning calorimetry (DSC) and scanning electron microscopy(SEM) results.However,LCP and PEN are found to be partially miscible at higher LCP content ,ascertained by DSC and dynamic mechanical analysis(DMA).This is attributed to the transesterification reaction between PEN and PET moiety in the LCP molecules,SEM micrographs reveal a skin/core morphology in the tensile bars,that is, the LCP is better oriented in the skin than in the core region.At lower LCP content ,the dispersed LCP phase is spherical in the core and ellipsoidal in the skin with long axes oriented in the flow direction.DSC studies show that the crystallization rate is significantly enhanced by the presence of LCP up to 50 wt % ,where the LCP acts as a nucleating agent for PEN crystallization .The melting temperature decreases with LCP content,probably as a result of imperfect crystals formed in the presence of LCP heterogeneous nucleating centers and the increasing miscibility between LCP and PEN .,
机译：液晶共混物（LCP）和聚（2,6-萘二甲酸乙二酯）（PEN）的二元共混物进行熔融共混并注塑成型，研究了力学性能与LCP含量的关系，极限拉伸强度和杨氏模量LCP含量高于混合物规则所预测的理论值，并且在LCP含量为70 wt％时表现出协同行为。然而，抗张强度随LCP含量（10至30 wt％）而降低。机械性能差是由于差示扫描量热法（DSC）和扫描电子显微镜（SEM）结果表明，PEN与LCP的原纤化行为不相溶。然而，通过DSC和动态力学分析确定，LCP和PEN在较高的LCP含量下可部分混溶。 （DMA）。这归因于LCP分子中PEN和PET部分之间的酯交换反应，SEM显微照片显示了拉伸棒中的皮肤/核心形态，即LCP i LCP含量较低时，分散的LCP相在芯部呈球形，在表皮中呈椭圆形，长轴指向流动方向。DSC研究表明，结晶速率明显提高当存在高达50 wt％的LCP时，LCP充当PEN结晶的成核剂。熔融温度随LCP含量的降低而降低，这可能是由于存在LCP异质成核中心并形成不完整晶体而导致的。 LCP和PEN之间的互溶性。

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