文章摘要
聚碳酸酯/聚萘二甲酸乙二醇酯复合物拉伸应变硬化的形成
Forming of Strain Harden in Tensile Test of Polycarbonate and Polyethylene Naphthalate Composites
  
DOI:10.16865/j.cnki.1000-7555.2017.09.017
中文关键词: 聚碳酸酯/聚萘二甲酸乙二醇酯共混  增容剂  力学性能  应变硬化
英文关键词: polycarbonate / poly(ethylene-2,6-naphthalene) composites  compatibilizer  mechanical performance  strain harden
基金项目:江苏省自然科学基金资助项目(BK2011519);江苏省研究生科研与实践创新计划项目(KYCX17_1833)
作者单位
周应国,苏北 江苏科技大学材料科学与工程学院,江苏 镇江 212003 
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中文摘要:
      为提高聚碳酸酯(PC)的力学性能,用不同比例的聚萘二甲酸乙二醇酯(PEN)与其共混,并选用乙烯-丙烯酸甲酯-甲基丙烯酸缩水甘油酯无规三元共聚物(E-MA-GMA)作为增容剂组成不同的PC/PEN 共混体系。文中对不同PC/PEN复合物的拉伸应力应变行为进行研究,结果表明,与单纯的PC材料相比,加入PEN 能够提高其力学性能,尤其当PEN的质量占比为25%时,其力学性能提高最为明显。同时,其力学性能与组分的相容性密切相关,增容剂的加入能够促进应变硬化的发生,从而促使PC/PEN复合物的断裂强度及断裂伸长率均显著增大。截面形貌、热分析及动态力学分析等研究的结果表明,其力学性能提高可以归因于PC/PEN复合物在拉伸中伴随其应变硬化过程而形成的稳定纤维结构。
英文摘要:
      In order to improve the mechanical performance of polycarbonate (PC), different contents of poly(ethylene-2,6-naphthalene) (PEN) were blended with PC, and ethylene-methyl acrylate- glyceryl methacrylate terpolymer (E-MA-GMA) was selected as compatibilizer. The different PC/PEN composite were then prepared by conventional injection molding, and tested for tensile properties at two test speeds. The samples were further characterized by differential scanning calorimetry (DSC), dynamic thermomechanical analysis (DMA), and scanning electron microscopy (SEM). It is found from the tensile testing that the mechanical performance can be improved obviously with the addition of PEN. The influence of PEN on the mechanical performance is most remarkable when the ratio of PC and PEN is 25%. It is also found that there is a relationship between the mechanical performance and the compatibility of two phases of the composites. The phenomenon of the strain harden could be observed for the composites, especially, the addition of E-MA-GMA, which resulting in a great increase of the break strength and the strain-at-break. Furthermore, the mechanism of performance improvement was studied by SEM observation, DSC analysis, and DMA test. The results show that the improvement of mechanical performance can be attributed to the stable fiber-shape structure which is formed in the process of the tensile test.
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