摘要
以马来酸酐/苯乙烯混合物为接枝单体,采用反应挤出制备长链支化聚丙烯,研究了不同相对分子质量聚丙烯在自由基反应中的活性,通过红外光谱表征改性聚丙烯的相对接枝率,表明大分子聚丙烯接枝率高于小分子。通过流变性质表征接枝物支化结构,并且通过对改性聚丙烯凝胶渗透色谱结果进行高斯分解,分析聚合物中不同相对分子质量组分,表征改性前后聚合物接枝与降解反应程度,综合分析不同相对分子质量聚丙烯在接枝反应中的表现。结果表明,分子量分布窄、相对分子质量大的聚丙烯在自由基反应中更占优势,但相对分子质量过大也会导致降解反应加剧。
Aimed at preparing long-chain branched polypropylene by reactive extrusion with maleic anhydride and styrene,the free radical reactivity of polypropylene with different molecular weight was studied.Relative grafting rate was compared by FT-IR characterization,indicating that polypropylene with higher molecular weight has a better grafting reaction behavior.The branched structure of the modified polypropylene was estimated by rheology test.GPC curves were analyzed as different molecular weight range to characterize the degree of grafting and degradation.The results indicate that polypropylene with high molecular weight has priority in free radical reaction,while also tends to degrade.
作者
陆奕权
郭天浩
刘涛
赵玲
Yiquan Lu;Tianhao Guo;Tao Liu;Ling Zhao(Shanghai Key Laboratory of Multiphase Structural Materials Chemical Engineering,East China University of Science and Technology,Shanghai 200237,China)
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2021年第3期17-23,共7页
Polymer Materials Science & Engineering
基金
国家重点研发计划(2016YFB0302200)。
关键词
聚丙烯
马来酸酐
苯乙烯
长链支化
降解
polypropylene
maleic anhydride
styrene
long chain branched
degradation
