Acta Chimica Sinica ›› 2012, Vol. 70 ›› Issue (12): 1371-1378.DOI: 10.6023/A1201191 Previous Articles     Next Articles

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潘忠诚, 彭娟   

  1. 聚合物分子工程国家重点实验室 复旦大学高分子科学系 上海 200433
  • 投稿日期:2012-01-19 修回日期:2012-03-26 发布日期:2012-03-29
  • 通讯作者: 彭娟
  • 基金资助:

    国家自然科学基金(No. 20804011)和国家科技部(No. 2008AA032102)资助项目.

Morphologies in Acetone-Annealed Polystyrene-Poly(methyl methacrylate) Diblock Copolymer Thin Films

Pan Zhongcheng, Peng Juan   

  1. State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai 200433, China
  • Received:2012-01-19 Revised:2012-03-26 Published:2012-03-29
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (No. 20804011) and the National High Technology Research and Development Program of China (No. 2008AA032102).

The time development of morphologies and structures of symmetric and asymmetric polystyrene- b-poly(methyl methacrylate) (PS-b-PMMA) diblock copolymer thin films after annealing in acetone vapor was investigated by tapping mode atomic force microscopy (AFM). Film thickness played an important role in the morphology evolution of symmetric PS-b-PMMA (fPSfPMMA, fPS is the volume fraction of the PS in PS-b-PMMA, fPMMA is the volume fraction of the PMMA) thin film. When film thickness was controlled according to their equilibrium bulk lamellar period, all the investigated thin films of PS-b-PMMA with different molecular weights can change from disordered pattern to nanoscale depression and at last to striped structures. In the case of asymmetric PS-b-PMMA systems, when the content of PS segment was low (25%, 36%), film morphology changed from disordered state to regularly packed spheres and directly to stripes, respectively; when the content of PS segment was high (70%), film morphology changed from disordered pattern to relatively flat state. The formation mechanisms of different film morphologies have been discussed in detail.

Key words: diblock copolymer, film morphology, acetone vapor annealing