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OALib Journal期刊
ISSN: 2333-9721
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乙烯共聚单体对双轴拉伸聚丙烯薄膜用树脂的结晶及拉伸性能的影响
DOI: 10.3724/SP.J.1105.2014.13315, PP. 455-465
Keywords: 用于制备双轴拉伸薄膜的聚丙烯,均聚与共聚,熔融与结晶,拉伸性能,形变机理
Abstract:
采用热分析、光学显微镜、拉伸测试与广角X-射线衍射等方法研究了双轴拉伸聚丙烯薄膜用均聚聚丙烯（h-BOPP）与含有少量乙烯单体的共聚聚丙烯（c-BOPP）材料的熔融、结晶特性和拉伸性能.研究发现，与均聚样品相比，共聚样品的等规度低，结晶速率慢，在相同的结晶温度条件下，其半结晶时间较长.退火处理后，结晶完善程度增加，均聚和共聚样品的断裂伸长率均比其未退火处理的低.但共聚样品的结晶速率慢，经过退火处理后其结晶完善性稍低于均聚样品，所以其断裂伸长率略大于均聚样品.经过拉伸形变后，样品的结晶结构被部分破坏，取向的非晶的分子链在后续的升温过程中很容易重构为更加完善的结晶结构，由于分子链结构的差异，均聚样品的结晶重构能力更强.阐释了由于链结构的不同导致的BOPP拉伸性能和结晶性能差异的机理.
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