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OALib Journal期刊
ISSN: 2333-9721
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烷基化程度对N-十八烷基化聚乙烯亚胺梳状高分子结构的影响
DOI: 10.3724/SP.J.1105.2013.12136, PP. 56-62
Keywords: 梳状高分子,聚乙烯亚胺,结晶,侧链烷基
Abstract:
利用烷基化方法制备了烷基化取代程度(DS)介于47%~17.6%的N-十八烷基聚乙烯亚胺(PEI18C)梳状高分子.通过红外光谱、差示扫描量热法(DSC)、X-射线衍射和热失重分析等方法研究了PEI18C梳状高分子的结构、结晶行为和热稳定性,探讨了侧链烷基DS对C18侧链结晶及临界结晶行为的影响.结果发现,随DS的降低,PEI18C梳状高分子的结晶度由54.0%降至20.3%,可结晶碳原子数目由11.4个降到4.3个.受限于PEI骨架上C18烷基侧链的堆积排列模式并没有发生根本变化,仍以六方晶胞的形式进行排列.结果表明,侧链烷基DS或沿主链的侧链烷基分布密度对梳状高分子的结晶行为和临界结晶能力有明显的影响.从侧链结晶的角度,分析了侧链烷基取代度对梳状高分子结晶及热稳定性的影响.
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