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Progress in Chemistry 2010, Vol. 22 Issue (07): 1490-1498 Previous Articles   Next Articles

• Invited Article •

Environmentally Friendly and Controlled Radical Polymerization

Cai  Yuanli**   Lu  Lican   Jiang  Wending   Zhang  Haijia   Deng  Junjie   LI  Yaohua   Shi  Yi   

  1. ( Key Laboratory of Enviornmentally Friendly Chemistry and Applicaitons of Ministry of Education, Key Laboratory of Polymeric Materials&Applicaiton Technology of Hunan Province, Key Laboratory of  Advanced Functional Ploymeric Materials of College of Human Province, College of Chemistry, Xiangtan University, Xiangtan 411105, China )
  • Received: Online: Published:
  • Contact: Cai Yuanli E-mail:ylcai98@xtu.edu.cn
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In recent years, our work focused on the development of light-activating ambient temperature RAFT polymerization to be environmentally friendly, facile and rapid, living and well-controlled, and suitable for a variety of monomers. Our results demonstrate that as chain transfer agents(CTA) of RAFT polymerization, the thiocarbonylthio compounds exhibit absorptions separately in UV and visible light ranges. The strong UV absorption leads to the photolysis of CTA functionalities, but the weak absorption in visible light wave range may significantly activate the fragmentation reaction of their intermediate radicals, thus accelerate the RAFT process without loss of its living character. High efficiency of photo-initiation may significantly shorten the initialization period. Thermo-activation of this polymerization is negligible below 30oC. This polymerization immediately starts or ceases upon switching on or off this visible light. Accordingly, we exploited a facile, rapid and well-controlled visible light activating ambient temperature RAFT polymerization. This environmently friendly approach may extend to the solar light activation or in aqueous solution, and for the synthesis of thermo-responsive water-soluble polymers and biomimetic photo-responsive polymers.

Contents 
1 Introduction 
2 Our opportunity: UV-vis spectra characters of chain transfer agents for RAFT polymerization 
3 Ambient temperature RAFT polymerization under long-wave UV radiation 
4 Ambient temperature RAFT polymerization under visible light radiation
5 Ambient temperature RAFT polymerization under solar light radiation
6 Ambient temperature RAFT polymerization in aqueous solution under long-wave UV radiation 
7 Applications of ambient temperature RAFT polymerization under visible light radiation 
7.1 Rapid and well-controlled synthesis of novel thermo-responsive water-soluble polymers 
7.2 Rapid and well-controlled synthesis of biomimetic photo-responsive functional polymers 
8 Conclusions and outlook

Key words: RAFT polymerization, ambient temperature, visible light, rapid, well-controlled, real-time control

CLC Number: 

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