Aggregation behavior of cyclic rod-coil diblock copolymers in selective solvents

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• 作者：Wen-ping Zhang ; Xiang-hong Wang ; Lin-li He 何林李
• 关键词：Cyclic rod ; coil ; Ribbon bundle ; Cyclization
• 刊名：Chinese Journal of Polymer Science
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：34
• 期：4
• 页码：420-430
• 全文大小：3,159 KB
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• 作者单位：Wen-ping Zhang (1)
  Xiang-hong Wang (2)
  Lin-li He 何林李 (1)
  
  1. Department of Physics, Wenzhou University, Wenzhou, 325035, China
  2. Wenzhou Vocational & Technical College, Wenzhou, 325035, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Condensed Matter Physics
  Industrial Chemistry and Chemical Engineering
  Polymer Sciences
  Characterization and Evaluation of Materials
  
• 出版者：Chinese Chemical Society and Institute of Chemistry, CAS, co-published with Springer
• ISSN：1439-6203

文摘

The aggregation behavior of cyclic rod-coil (RC) diblock copolymers in dilute solutions is investigated through dissipative particle dynamics simulation. By varying the rod length and coil length, cyclic RC copolymers in selective solvents exhibit various morphologies, including spherical micelle, vesicle, bilayer disc, and ribbon bundle structure. Compared with the equivalent linear RC copolymer, only spherical micelle and barrel bundle phase are observed. Rod length is the major factor that controls the liquid-crystalline behavior of RC copolymer systems, while the coil length has a secondary effect on the aggregate morphology. The size of rod bundle varies with the coil length, especially for the end-toend ribbon bundle and side-by-side barrel bundle, which are assembled by cyclic and linear RC copolymer solutions. This finding indicates that the ribbon bundle or nanofiber-like structure in cyclic RC copolymers can be obtained by controlling the rod length and coil length, and thus the optical and electrical properties of RC copolymer would be further controlled and optimized. Results illustrate that cyclization of a linear RC copolymer induces remarkable differences in the rod arrangement and aggregation behavior, thereby indicating the competition between interfacial energy, rod orientational entropy, coil stretching entropy, and packing constraints. Keywords Cyclic rod-coil Ribbon bundle Cyclization