Citation: Yong Zhou, Pei Bai, Miao Huo, Yu-Jie Chen, Hua Li, Hong-Mei Kang, He-Zhou Liu, Yun-Long Guo. Slow Down Dewetting in Polymer Films by Isocyanate-treated Graphite Oxide[J]. Chinese Journal of Polymer Science, ;2018, 36(9): 1070-1076. doi: 10.1007/s10118-018-2147-2 shu

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

Yong Zhou ^1,2 ,
Pei Bai ^1,3 ,
Miao Huo ^1,3 ,
Yu-Jie Chen ^1,2 ,
Hua Li ^1,2 ,
Hong-Mei Kang ^1,2 ,
He-Zhou Liu ^1,2 ,
Yun-Long Guo ^1,2,3,,

a.
The State Key Lab of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China
b.
School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
c.
University of Michigan-Shanghai Jiao Tong University Joint Institute, Shanghai Jiao Tong University, Shanghai 200240, China

Corresponding author: Yun-Long Guo, yunlong.guo@sjtu.edu.cn
Received Date: 25 December 2017
Revised Date: 28 February 2018
Accepted Date: 1 May 2018
Available Online: 1 June 2018

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 (T_g). Via annealing the 50–120 nm thick composite and associated neat PS films at temperatures ranging from 35 °C to 70 °C aboveT_g, 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.
- Dewetting,
- Thin polymer films,
- Thermal instability,
- iGOs network
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