N-烷基化聚对苯二甲酰对苯二胺梳状高分子中烷基侧链对刚性主链堆积行为的影响  

Influence of Alkyl Side Chains on the Packing Behavior of Main Chain of N-Alkylated Poly(p-phenylene terephthamide)

作　　者：孔磊[1] 赵莹[1] 石海峰[2] 王笃金[1] 徐端夫[1] 

机构地区：[1]中国科学院化学研究所,工程塑料重点实验室,北京100190 [2]天津工业大学材料科学与工程学院,功能纤维研究所,天津300387

出　　处：《高等学校化学学报》2012年第7期1595-1599,共5页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:20904040);国家"八六三"计划重大项目(批准号:2010AA03A406)资助

摘　　要：基于聚对苯二甲酰对苯二胺(PPTA),采用N-烷基化方法制备了系列PPTACns(烷基侧链碳原子数n=8,10,12,14,16,18)刚性主链梳状高分子,利用DSC,XRD和FTIR等方法研究了其主链堆积行为、分子链构象及热性能等与烷基侧链长度及结晶特性之间的关系.XRD和DSC结果表明,当烷基侧链碳原子数达到14时,烷基侧链发生结晶.XRD结果显示,PPTACns具有层状结构,烷基侧链长度对主链层间距影响显著.FTIR研究发现,烷基侧链的聚集状态对PPTACns分子链的构象产生较大影响,伴随着烷基侧链结晶的熔融,PPTACns的分子链构象发生显著改变.烷基侧链处于熔融状态的PPTACns的νC O和γC—H谱带峰位与烷基侧链不结晶的PPTACn接近.A series of comblike N-alkylated poly（p-phenylene terephthamide） comb-like polymers（denoted as PPTACns,n=8,10,12,14,16,18,number of carbon atoms in alkyl side group） with rigid main chain was prepared using N-alkylated method.The methods of DSC,XRD and FTIR were utilized to investigate the packing behavior of the rigid main chain,conformation of the comblike polymer and thermal behavior,and the correlation between these properties with the alkyl side chain length.The results of XRD and DSC indicate that the alkyl side chains crystallize when the carbon number of the side chain reaches 14.The XRD results indicate that PPTACns have layered structure and their layer spacing depends on the carbon number of the side chain.The FTIR results indicate that the conformation of the PPTACns molecular chain is affected by the variation of the crystalline state of the alkyl side chain.For PPTACns with crystallized alkyl side chain,the conformation of the molecular chain undergoes an obvious change as the side chain is melt.The peak position of νC-O and γ-C—H bands in PPTACns with molten alkyl side chain are similar to that of PPTACns with non-crystallizable alkyl side chain.

关 键 词：N-烷基化聚对苯二甲酰对苯二胺 梳状高分子 刚性主链 烷基侧链 

分 类 号：O631[理学—高分子化学]