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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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稀土β-成核剂对1-丁烯本体聚合和产物聚(1-丁烯)结晶性能的影响
DOI: 10.11777/j.issn1000-3304.2014.14024, PP. 1356-1363
Keywords: Ziegler-Natta催化剂,聚(1-丁烯),稀土β-成核剂,结晶
Abstract:
采用Ziegler-Natta催化剂催化1-丁烯本体聚合,稀土β-成核剂经原位聚合的方法加入到体系,并考察成核剂加入量对产物聚(1-丁烯)的分子量和结晶性能的影响.通过凝胶渗透色谱(GPC)、示差扫描量热仪(DSC)、偏光显微镜(POM)和广角X射线衍射仪(WAXD)对聚合物进行表征分析.实验结果表明,随着稀土β-成核剂加入量的增大,催化剂活性有所下降,聚合物等规度略有提高,而聚合的分子量显著提高,分子量分布变窄;聚合时成核剂的加入提高了聚(1-丁烯)的结晶性能,随着成核剂加入量的增多聚合物晶粒变小且尺寸趋向均一化,聚合物结晶度也得到了提高,当成核剂加入量为30mg时,聚合物结晶度和熔融焓出现突变现象.此外,稀土β-成核剂的加入会改变熔融前聚(1-丁烯)中晶型Ⅰ'和Ⅲ所占比例从而影响聚合物的熔点,成核剂的存在也改变了晶型II向晶型I的转变速率,缩短了晶型转变周期.
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