Long-Range Ordered Crystallization Structure in the Micromolded Diblock Copolymer Thin Film

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• 作者：Peng Zhang ; Haiying Huang ; Tianbai He ; Zhijun Hu
• 刊名：ACS Macro Letters
• 出版年：2012
• 出版时间：August 21, 2012
• 年：2012
• 卷：1
• 期：8
• 页码：1007-1011
• 全文大小：285K
• 年卷期：v.1,no.8(August 21, 2012)
• ISSN：2161-1653

文摘

Confined crystallization of the micromolded poly(butadiene)-block-poly(蔚-caprolactone) (PB-b-PCL) diblock copolymer thin film was studied in this work. The long-range regular ordering of the PCL crystal with crystallographic b-axis parallel to the long-axis of the channel was detected, as indicated by the electron diffraction and grazing-incidence X-ray diffraction experimental results. This preferential crystallographic orientation is mainly because that PCL block crystallization was readily influenced by the geometric effect, then, the fast-growth direction (crystallographic b-axis) was forced to extend along the long-axis of the channel to grow long. Moreover, the substrate induced ordering of the block copolymer restricted the 鈥渋n-plane鈥?molecular diffusion in the residual layer, and cross-channel crystallization was precluded. Hence, micromolding seems to be a promising method for tailoring the nanoscale crystallization of block copolymer in thin films.