对叔丁基杯[4]芳烃包合物对聚乳酸结晶过程的影响  

Study on crystallization of poly(L-lactic acid) nucleated with p-tert-butylcalix[4]arene inclusion complex

作　　者：石尧麒[1] 辛忠[2] 陆颖音[1] 周帅[1] 

机构地区：[1]华东理工大学化工学院上海市多相结构材料化学工程重点实验室,上海200237 [2]华东理工大学化工学院化学工程联合国家重点实验室,上海200237

出　　处：《化工学报》2015年第9期3762-3768,共7页CIESC Journal

基　　金：国家自然科学基金项目(21306047);中央高校基本科研业务费项目(222201314051;22A201514016)~~

摘　　要：以对叔丁基杯[4]芳烃(tBC4)为主体,甲苯、邻二甲苯、间二甲苯、对二甲苯为客体分子,制备4种tBC4包合物tBC4-t、tBC4-ox、tBC4-mx、tBC4-px。考察了tBC4包合物对左旋聚乳酸(PLLA)结晶性能及结晶形态的影响。结果表明,tBC4包合物能将PLLA的结晶峰值温度(Tp)提高近7℃;进一步研究发现几种包合物在经高温后,客体小分子逃逸,样品均改变为相同的晶体结构,因此对PLLA成核有相同的影响;此外,含有成核剂的PLLA球晶尺寸小于空白PLLA的球晶尺寸,成核剂的加入不改变PLLA球晶生长的方式。In this paper, four inclusion complexes were obtained by recrystallizing p-tert-butylcalix[4]arene （tBC4） from toluene, o-xylene, m-xylene and p-xylene. Then, the effects of tBC4 inclusion complexes on crystallization behavior of poly （L-lactic acid） （PLLA） were investigated with differential scanning calorimeter and polarized optical microscopy. The results showed that the crystallization peak temperature of PLLA nucleated by tBC4 inclusion complexes increased 7℃, which indicated that these compounds owned the nucleation ability for PLLA. After suffering high temperature, crystal structures of four inclusion complexes reverted to nearly the same. Therefore, all these inclusion complexes showed the same nucleation ability. Crystallization morphologies of PLLA and nucleated PLLA were studied by means of polarizing optical microscopy, indicating that the addition of nucleating agent can decrease PLLA spherulite size without changing its growth pattern.

关 键 词：聚乳酸 成核剂 芳烃 包合物 

分 类 号：TQ316.6[化学工程—高聚物工业]