摘要
聚乙烯薄膜中"鱼眼"形成的原因主要是聚乙烯中存在交联点、杂质或结晶物,针对聚乙烯DFDA7042吹膜制品"鱼眼"异常的情况,采用差示扫描量热仪、高温核磁共振碳谱仪以及X射线衍射仪分析"鱼眼"区域树脂与非"鱼眼"区域树脂的结构差别。结果表明:聚乙稀薄膜的支化度为17.4个/1 000 C,"鱼眼"的支化度为40.5个/1 000 C,说明形成"鱼眼"的聚乙烯分子中支化度很高,两者的结晶行为不一致;"鱼眼"为高支化小分子聚乙烯;"鱼眼"的形成是部分聚乙烯在吹塑的膜泡冷却段结晶速率过快,先于周围的DFDA 7042形成非晶区球晶。
The“fish eye”in polyethylene(PE)films is formed due to the existence of crosslink points,impurities or crystal substances.The differential scanning calorimeter,carbon nuclear magnetic resonance spectrometer and X-ray diffractometer were used to investigate the structure differences between“fish eye”and non“fish eye”areas in DFDA 7042 films.The results show that the degree of branching of the PE films is 17.4 ethyl/1 000 C,while that of the“fish eye”is 40.5 ethyl/1 000 C,which represents high branching degree in PE forming“fish eye”,that is,their crystallization behaviors are different.The“fish eye”is high branching small molecular PE,which is formed as the result of high crystallization rate of PE in the process of bubble film cooling which has led to the formation of spherulite in amorphous region faster than neighboring DFDA 7042.
作者
王文燕
马丽
任鹤
Wang Wenyan;Ma Li;Ren He(Daqing Petrochemical Research Center,Petrochemical Research Institut of CNPC,Daqing 163714,China)
出处
《合成树脂及塑料》
CAS
北大核心
2018年第1期41-43,共3页
China Synthetic Resin and Plastics
关键词
聚乙烯
薄膜
鱼眼
polyethylene
film
fish eye
作者简介
王文燕,女,1981年生,硕士,工程师,2007年毕业于天津大学化学工艺专业,研究方向为聚烯烃产品的加工应用及改性。E-mail:wwy459@petrochina.com.cn。
