中国塑料 ›› 2018, Vol. 32 ›› Issue (06): 65-71.DOI: 10.19491/j.issn.1001-9278.2018.06.010

• 材料与性能 • 上一篇    下一篇

双向拉伸聚丙烯薄膜在有机二氧化硅颗粒共存下的结晶结构和形态

张敏1,常欢1,李东立1,许文才2,付亚波1   

  1. 1. 北京印刷学院
    2. 北京印刷学院印刷装备工程研究中心
  • 收稿日期:2018-01-05 修回日期:2018-03-07 出版日期:2018-06-26 发布日期:2018-07-31
  • 基金资助:
    国家自然科学基金项目

Crystalline Structure and Morphology of Biaxial Oriented Polypropylene Film Under Coexistence of Silica Nanoparticles

  • Received:2018-01-05 Revised:2018-03-07 Online:2018-06-26 Published:2018-07-31
  • Contact: Dongli LI E-mail:lidongli6666@126.com

摘要: 通过乙烯乙酸乙烯酯共聚物(EVA)对纳米二氧化硅(SiO2)颗粒进行表面处理,然后与聚丙烯(PP)熔融共混制备了一种PP/纳米SiO2/EVA共混物,并且以此为原料制备了一种表层改性的双向拉伸聚丙烯(BOPP)薄膜。采用扫描电子显微镜分析表层的表面和其断面特殊的形貌,通过X射线衍射仪测试分析了改性薄膜结晶度、分子取向、晶粒尺寸,利用正电子湮没谱验证了改性薄膜中空穴的存在,研究结晶结构和形态与溶剂残留之间的关系。结果表明,相比于未改性的PP薄膜,在双向拉伸的情况下,改性后的BOPP薄膜中具有较高的结晶度和较小的晶粒尺寸,并且具有致密的表层结构和网状纤维束结构,这些特殊结构使得乙酸乙酯溶剂在薄膜中的扩散系数和溶解度减小,薄膜的力学性能得到显著提高。

Abstract: The PP/EVA/nano-SiO2 composites were prepared by melt blending, in which the nano-SiO2 was surface-treated with EVA, and then, a surface-modified BOPP film was prepared by using the resulting composites. The surface morphology and cross-section of the film were observed by scanning electron microscopy, and their degree of crystallinity, molecular orientation and grain size were detected by X-ray diffraction measurement. Furthermore, the presence of microholes in the film was confirmed by positron annihilation spectroscopy, and the relationship between the crystalline structure and morphology and the solvent residue was investigated. The results indicated that the modified BOPP film not only had a higher degree of crystallinity and smaller grain size than the unmodified one, but also had a dense surface structure and reticular fiber bundle internal structure. These characteristic structures make the diffusion coefficient and solubility of ethyl acetate small in the film, thus improving the mechanical properties significantly.