Engineering properties of compatibilized polypropylene/liquid crystalline polymer blends

Engineering properties of compatibilized polypropylene/liquid crystalline polymer blends
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增容聚丙烯/液晶聚合物共混物的工程性能

DOI：
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发表时间：
2011
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通讯作者：
D. Chakraborty
D. Chakraborty
中科院分区：
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文献类型：
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作者：
P. Mandal;S. K. Siddhanta;D. Chakraborty

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在单螺杆挤出机中制备聚丙烯 (PP) 和 Vectra A950（一种热致液晶聚合物 (LCP)）共混物，并在固定量（相对于 PP 和 LCP 混合物整体为 2%）的乙烯-丙烯酸 (EAA) 共聚物作为增容剂的情况下，改变 Vectra A950 的含量。对所研究的 LCP 掺入范围（2-10%）内的增容共混物进行机械分析表明，其模量、极限拉伸强度 (UTS) 和硬度有显着改善。傅里叶变换红外 (FTIR) 光谱研究表明，Vectra A950 片段和增容剂 EAA 之间通过氢键存在强相互作用。通过扫描电子显微镜 (SEM) 进行的形态研究表明，增容 PP/Vectra A950 共混物中出现了细小的纤维形态，这对机械性能有很大影响。差示扫描量热法研究表明，在 EAA 存在下，PP 的熔点最初下降，随后在 Vectra A950 存在下熔点增强。 TGA 显示所有共混物的热稳定性均高于基体聚合物 PP。流变学研究表明，极少量的 Vectra A 950 能够降低 PP 的熔体粘度，特别是在较低剪切速率区域，从而促进共混物的加工性能。 © 2011 Wiley periodicals, Inc. J Appl Polym Sci，2011
Polypropylene (PP) and Vectra A950, a thermotropic liquid crystalline polymer (LCP), blends were prepared in a single-screw extruder with the variation in Vectra A950 content in presence of fixed amount (2%, with respect to PP and LCP mixture as a whole) of ethylene-acrylic acid (EAA) copolymer as a compatibilizer. Mechanical analysis of the compatibilized blends within the range of LCP incorporations under study (2–10%) indicated pronounced improvement in the moduli, ultimate tensile strength (UTS), and hardness. Fourier transform infrared (FTIR) spectroscopy studies revealed the presence of strong interaction through H-bonding between the segments of Vectra A950 and the compatibilizer EAA. Morphological studies performed by scanning electron microscopy (SEM) manifested the development of fine fibrillar morphology in the compatibilized PP/Vectra A950 blends, which had large influence on the mechanical properties. Differential scanning calorimetry studies showed an initial drop of the melting point of PP in the presence of EAA followed by enhancement of the same in presence of Vectra A950. TGA showed an increase in the thermal stability for all blends with respect to matrix polymer PP. Rheological studies showed that a very small quantity of Vectra A 950 was capable of reducing the melt viscosity of PP particularly in the lower shear rate region and hence facilitated processibility of the blends. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011