摘要
实验采用双向拉伸聚乙烯(BOPE)原料线型低密度聚乙烯(LLDPE),用同步双向拉伸的方法制备BOPE薄膜,研究了双向拉伸过程中拉伸速率对薄膜结构和性能的影响。使用偏光显微镜(PLM)和差示扫描量热法(DSC)对未拉伸聚乙烯流延片的结晶形貌和热性能进行了研究。研究了不同拉伸速率下机器方向(MD)拉伸力的实时变化趋势,用DSC表征了不同BOPE薄膜样品的热性能。发现拉伸速率影响拉伸过程中聚乙烯晶体和分子结构及最终样品的结晶度和晶片厚度分布。实验研究了BOPE薄膜的力学和光学性能,分析了薄膜的宏观性能和分子结构之间的关系。实验结果表明,较高的拉伸速率有利于薄膜性能的提高。
BOPE films were prepared by synchronous biaxial stretching process of linear low density polyethylene(LLDPE). The effect of stretching rate on the structure and properties of films during biaxial tension was studied. The crystalline morphology and thermal properties of being unstretched polyethylene sheet were studied by polarizing microscope(PLM) and differential scanning calorimetry(DSC). The real-time trend of mechanical direction(MD) drawing force at different stretching rates was studied. The thermal properties of different BOPE films were characterized by DSC. It was found that the stretching rate had a great influence on the crystal and molecular structure of polyethylene during the tensile process, and also greatly affected the crystallinity and lamellae thickness distribution of the final sample. The mechanical and optical properties of BOPE films were studied, and the relationship between macroscopic properties and molecular structure of BOPE films was discussed. It was found that higher stretching rate was beneficial to improve the properties of BOPE films.
作者
徐萌
任月明
高达利
张师军
XU Meng;REN Yue-ming;GAO Dali;ZHANG Shi-jun(Beijing Research Institute of Chemical Industry,SINOPEC,Beijing 100013,China)
出处
《塑料科技》
CAS
北大核心
2020年第1期1-4,共4页
Plastics Science and Technology
基金
国家重点研发计划资助(2016YFB0302000)。
关键词
双向拉伸
聚乙烯
薄膜
拉伸速率
结晶
Biaxial stretching
Polyethylene
Film
Stretching rate
Crystallization
