CJCU

Chem. J. Chinese Universities ›› 2010, Vol. 31 ›› Issue (4): 815.

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Crystallization of H-Shaped (PS)2PEG(PS)2 Block Copolymer During Spin Coating

PAN Ying-Ying1,2, ZHANG Ji-Dong1, SHI Tong-Fei1*, AN Li-Jia1   

  1. 1. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China;
    2. Graduate School of the Chinese Academy of Sciences, Beijing 100049, China
  • Received:2009-07-03 Online:2010-04-10 Published:2010-04-10
  • Contact: SHI Tong-Fei. E-mail: tfshi@ciac.jl.cn
  • Supported by:

    国家自然科学基金创新研究群体科学基金(批准号: 50621302)资助.

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Abstract:

The morphologies of H-shaped (PS7)2PEG227(PS7)2 block copolymer films spin coated onto silicon wafers from different solutions were investigated by means of atomic force microscopy(AFM) and grazing incidence X-ray diffraction. We further compared the crystallization of H-shaped block copolymer with that of ply(ethylene oxide)(PEG) homopolymer. The presence of PS block changed the interaction of polymer and substrate. When solvent was tetrahydrofuran, the copolymer dewetted and crystallized after spin coating when the concentration of solution was 0.1% and 0.25%. As the concentration increased to 0.5%, dewetting was suppressed and two-dimensional spherulites appeared. If toluene was used as solvent, micelles were formed in the solution due to the differences between solubility of PEG and PS block, which changed the final film morphologies. Dendritic crystals containing edge-on and flat-on crystals appeared from the 0.1% solution. More compact crystals appeared while the concentration increased, and large square lamellae was observed after spin-coating of 0.5% solution.

Key words: Block copolymer; Crystallization; Spin coating; H-shape

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