CRCU

Chemical Research in Chinese Universities ›› 2018, Vol. 34 ›› Issue (5): 828-832.doi: 10.1007/s40242-018-8126-x

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Ceiling Degree of Polymerization for Brush Polymers Prepared via ROMP of Poly(tert-Butyl Acrylate) Macromonomers

QIAO Yaping, YUAN Xiaoyan, ZHAO Yunhui, REN Lixia   

  1. School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Tianjin University, Tianjin 300072, P. R. China
  • Received:2018-04-17 Revised:2018-05-21 Online:2018-10-01 Published:2018-08-03
  • Contact: REN Lixia,Email:lxren@tju.edu.cn E-mail:lxren@tju.edu.cn
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.21574098).

Abstract: Controlled preparation of brush polymers is important in the design of functional materials. In this study, poly(tert-butyl acrylate) macromonomers functionalized with norbornenyl end group(NB-PtBA) were synthesized via atom transfer radical polymerization in three different molecular weights, 2000(NB-PtBA-2k), 3000(NB-PtBA-3k), and 8000(NB-PtBA-8k). Additionally, brush polymers with PtBA as side chains were synthesized via ring-opening metathesis polymerization(ROMP). Kinetic studies on ROMP of NB-PtBA showed that there was a ceiling degree of polymerization(CDP) for the brush polymers, beyond which the polymerization of NB-PtBA was out of control. For brush polymers of P[NB-PtBA-2k] and P[NB-PtBA-3k], CDPs were estimated to be ca. 400, but the value of P[NB-PtBA-8k] was ca. 100. Therefore, the controlled ROMP of brush polymers was critical at the CDP limit with increased macromonomer molecular weight.

Key words: Ring-opening metathesis polymerization, Macromonomer, Brush polymer, Ceiling degree of polymerization, Kinetics study