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Progress in Chemistry 2010, Vol. 22 Issue (06): 1169-1176 Previous Articles   Next Articles

• Invited Article •

Advances in the Anionic Ring Opening Polymerization Mechanism and Dynamics of Hexamethylcyclotrisiloxane(D3)

Jiang Bo1; Zhan Xiaoli2; Yi Lingmin3; Zhang Xiaodong1; Xu Min1; Sun Li1   

  1. (1. Energy Research Institute of Shandong Academy of Science, Jinan, 250014, China; 2. Department of Chemical and biochemical Engineering, Zhejiang University，Hangzhou 310027，China; 3. Key Laboratory of Advanced Textile Materials and Manufacturing Technology of Ministry of Education, Zhejiang Sci-Tech University, Hangzhou 310018, China)
  • Received: Revised: Online: Published:
  • Contact: Jiang Bo E-mail:jiangb@sderi.cn
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The advantages in the living anionic polymerization of hexamethylcyclotrisiloxane(D3) in terms of polymerization mechanism and dynamics were summarized. Frye suggested that three kinds of initiation compounds were formed in hydrocarbon solvents and no polymerization proceeded without promotor. The mechanism proposed by Frye was accepted by follower and validated by some researches based on MALDI-TOF technology. During the polymerization, promotors, solvents, initiators and process could change the equilibrium between the association and disassociation of living chains, which could effect the “back-biting” and redistribution side reaction in anionic ring opening polymerization of D3. First-order kinetics was obtained in monomer concentration. Promotors and initiators changed the association ability of living chain end, also the polymerization dynamics.

Contents
1 Anionic ring opening polymerization mechanism of D3
1.1 Anionic ring opening polymerization mechanism of D3 without promotor
1.2 Anionic ring opening polymerization mechanism of D3 with promotor
1.3 Anionic ring opening polymerization mechanism of D3 in different solvents
1.4 The effect of process on anionic ring opening polymerization mechanism of D3
1.5 The effect of initiator type on anionic ring opening polymerization mechanism of D3
2 Anionic ring opening polymerization kinetics of D3
2.1 The effect of impurity on anionic ring opening polymerization kinetics of D3
2.2 The effect of promotors on anionic ring opening polymerization kinetics of D3
3 Conclusions

Key words: hexamethylcyclotrisiloxane, living anion polymerization, ring-opening ploymerization, polymerization mechanism, kinetics

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