Slow Down Dewetting in Polymer Films by Isocyanate-treated Graphite Oxide  

作　　者：Yong Zhou Pei Bai Miao Huo Yu-Jie Chen Hua Li Hong-Mei Kang He-Zhou Liu Yun-Long Guo 

机构地区：[1]The State Key Lab of Metal Matrix Composites, Shanghai Jiao Tong University [2]School of Materials Science and Engineering, Shanghai Jiao Tong University [3]University of Michigan-Shanghai Jiao Tong University Joint Institute, Shanghai Jiao Tong University

出　　处：《Chinese Journal of Polymer Science》2018年第9期1070-1076,共7页高分子科学（英文版）

基　　金：the start-up fund of Y.G.from both University of Michigan-Shanghai Jiao Tong University Joint Institute;School of Materials Science and Engineering at SJTU;the National Science Foundation of China for financial support through the General Program(No.2157408);the foundation of Shanghai Sailing Plan(No,16YF1406100);the National Youth 1000 Talent Program of China;the Shanghai 1000 Talent Plan;the Scientific Research Foundation for the Returned Overseas Chinese Scholars,State Education Ministry of China

摘　　要：Isocyanate-treated graphite oxides （iGOs） were well-dispersed into the polystyrene （PS） thin films and formed a novel network structure. With control in fabrication, an iGOs-web layer was horizontally embedded near the surface of the films and thus formed a composite slightly doped by iGOs. This work demonstrated that the iGOs network can remarkably depress the dewetting process in the polymer matrix of the composite, while dewetting often leads to rupture of polymer films and is considered as a major practical limit in using polymeric materials above their glass transition temperatures （Tg）. Via annealing the 50-120 nm thick composite and associated neat PS films at temperatures ranging from 35℃ to 70 ℃ above Tg, surface morphology evolution of the films was monitored by atomic force microscopy （AFM）. The iGOs-doped PS exhibited excellent thermal stability, i.e., the number of dewetting holes was greatly reduced and the long-term hole growth was fairly restricted. In contrast, the neat PS film showed serious surface fluctuation and a final rupture induced by ordinary dewetting. The method developed in this work may pave a road to reinforce thin polymer films and enhance their thermal stability, in order to meet requirements by technological advances.Isocyanate-treated graphite oxides （iGOs） were well-dispersed into the polystyrene （PS） thin films and formed a novel network structure. With control in fabrication, an iGOs-web layer was horizontally embedded near the surface of the films and thus formed a composite slightly doped by iGOs. This work demonstrated that the iGOs network can remarkably depress the dewetting process in the polymer matrix of the composite, while dewetting often leads to rupture of polymer films and is considered as a major practical limit in using polymeric materials above their glass transition temperatures （Tg）. Via annealing the 50-120 nm thick composite and associated neat PS films at temperatures ranging from 35℃ to 70 ℃ above Tg, surface morphology evolution of the films was monitored by atomic force microscopy （AFM）. The iGOs-doped PS exhibited excellent thermal stability, i.e., the number of dewetting holes was greatly reduced and the long-term hole growth was fairly restricted. In contrast, the neat PS film showed serious surface fluctuation and a final rupture induced by ordinary dewetting. The method developed in this work may pave a road to reinforce thin polymer films and enhance their thermal stability, in order to meet requirements by technological advances.

关 键 词：DEWETTING Thin polymer films Thermal instability iGOs network 

分 类 号：TB43[一般工业技术]