摘要
通过乙烯-乙酸乙烯酯共聚物(EVA)对纳米二氧化硅(SiO_2)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SiO_2/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。
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.
作者
张敏
常欢
李东立
许文才
付亚波
ZHANG Min;CHANG Huan;LI Dongli;XU Wencai;FU Yabo(Beijing Key Laboratory of Printing and Packaging Materials and Technology,Beijing Institute of Graphic Communication,Beijing 102600,China)
出处
《中国塑料》
CAS
CSCD
北大核心
2018年第6期65-71,共7页
China Plastics
基金
国家自然科学基金项目(31471653)
北京市自然科学基金(2182018)
北京市教委科技创新提升项目(PXM2017_014223_000034)
关键词
聚丙烯薄膜
串晶结构
溶解度
扩散系数
polypropylene film
shish kebab crystal
solubility
diffusivity
