部分解缠结聚苯乙烯在纳米孔道中的受限流动行为研究  

Flow behavior of partially disentangled polystyrene chains in confined channels of anodic aluminum oxide templates

作　　者：吴茗 尹相斐 王晓亮 周东山 高云[1] 薛奇[1] 韩江龙 Ming Wu;Xiangfei Yin;Xiaoliang Wang;Dongshan Zhou;Yun Gao;Gi Xue;Jianglong Han(Key Laboratory of High Performance Polymer Materials and Technology of Ministry of Education(MOE),Siate Key Laboratory of Coordination Chemistry,School of Chemistry and Chemical Engineering,Nanjing University,Nanjing 210023,China;Huahaichengke Co.,Lianyungang 222047,China)

机构地区：[1]南京大学化学化工学院,高性能高分子材料教育部重点实验室,配位化学国家重点实验室,南京210023 [2]江苏华海诚科新材料股份有限公司,连云港222047

出　　处：《中国科学：化学》2023年第4期768-777,共10页SCIENTIA SINICA Chimica

基　　金：国家自然科学基金(编号:22173046,21790345);国家重点研发计划(编号:2020YFA0711504)资助项目。

摘　　要：高分子的长链特征使其对纳米到微米尺度的空间受限非常敏感,也是当前微电子电路、微器件传感器等领域材料制造及其工艺研发中的关键之一.本工作从不同缠结程度的窄分布聚苯乙烯出发,以不同孔径的阳极氧化铝模板为二维受限空间,研究了高分子熔体在其中的纳米受限流动行为.我们发现,缠结程度低的聚苯乙烯在受限流动初期显著快于本体,后因缠结恢复逐渐降至与本体相当,缠结恢复时间尺度与宏观流变实验获得的缠结恢复时间处于同一个数量级.我们认为缠结程度降低后流动的加速来源于受限状态时在压力梯度推动下高分子链通过蛇行进入孔道的速率加快;同时受限链段由于非平衡构象增多而重排更加频繁,导致强受限程度下部分解缠结样品的缠结恢复加快.本文希望通过对链缠结在高分子链进入受限空间中作用的探索,为受限态高分子复合材料的加工工艺提供新的理解.The development of microfabrication has led to an increasing interest in the flow behavior of polymer melts in narrow channels like nanopores.Polymers are extremely sensitive to the confinement at nanoscale,which results in very complex flow and cooling behaviors.In this article,we reported an unexpected flow behavior of partially disentangled polystyrene infiltrated in anodic aluminum oxide templates.We found that the flow behavior of partially disentangled polystyrene was faster than the bulk at the beginning,then gradually returned to the same level as the bulk.The time scale of reentanglement was shorter than the modulus-build-up process of disentangled PS obtained from rheological experiments.The partially disentangled polymers are supposed to show enhanced chain mobility resulting from reptation under confinement and rearrangement of chain segments,which results in a higher speed in confined flow compared with the bulk,and a faster reentanglement process under strong confinement.The discovery will probably deepen the understanding of entanglement at the nanoscale confinement,thus optimizing the process of microfabrication.

关 键 词：二维受限 聚苯乙烯 解缠结 纳米孔 AAO 

分 类 号：O631.12[理学—高分子化学]