RAFT 聚合技术.doc

RAFT 聚合技术RAFT 聚合技术首先由Rizzardo 等在第37 届国际高分子大会上公布。该过程是一个可逆反应, 称为可逆加成- 裂解链转移过程(Reversible Addition-Fragmentation chain Transfer),也就是RAFT。RAFT体系适用的单体种类多,聚合所需温度较低,可制备较高分子量的窄分布聚合物。因此,具有广阔的应用前景。 RAFT technology CSIRO and DuPont have developed an innovative technology known as RAFT (for Reversible Addition Fragmentation chain Transfer), which allows for the synthesis of specially designed polymeric materials with enhanced properties. CSIRO has licensed this technology to Strem to make available to you for research purposes.RAFT technology is a sophisticated form of controlled free radical polymerization. Often known as living polymerization (it can be stopped and restarted at anytime) this technology enables the synthesis of tailored polymers with unprecedented control over composition and architecture.Polymers may be synthesized more readily, using RAFT technology,? With predetermined molecular weight and narrow molecular weight distributions over a wide range of monomers and reaction ? conditions,? With reactive terminal groups that can be purposely manipulated, including further polymerization,? With complex architecture, including A B diblock, A B A triblock, graft, star; gradient and branched polymers (see Fig I),? That are based on scaleable manufacturing processes utilizing conventional processing equipment. RAFT technology can be used with a wide range of monomers and monomer mixtures, and can be used in all modes of free radical polymerization, including solution, emulsion and suspension polymerizations. This allows for an unlimited array of tailored compositions and complex architectures under standard conditions. The RAFT process Implementing the RAFT process can be as simple as introducing a suitable chain transfer agent, known as a RAFT Agent (see Fig 2), into conventional free radical polymerization, while employing plant and equipment. The RAFT Agents allow for the preparation of polymers with low polydispersity, well-defined microstructure and predete