高等学校化学学报 ›› 2001, Vol. 22 ›› Issue (2): 345.

• 研究快报 • 上一篇    下一篇

梯度引发自由基聚合体系(Ⅰ)──基原法合成超高分子量聚合物

杨万泰, 刘涛, 尹梅贞   

  1. 北京化工大学聚合物科学系, 北京 100029
  • 收稿日期:2000-11-23 出版日期:2001-02-24 发布日期:2001-02-24
  • 通讯作者: 杨万泰(1956年生),男,博士,教授,博士生导师,从事可控/活性聚合、光聚合及表面聚合等领域的研究.
  • 基金资助:

    教育部99跨世纪人才计划基金

Graduation Initiating Radical Polymerization(Ⅰ)── Synthesis of Hyper-high Molecular Weight Polymers by Free Radical Sources

YANG Wang-Tai, LIU Tao, YIN Mei-Zhen   

  1. Department of Polymer Science, Beijing University of Chemical Technology, Beijing 100029, China
  • Received:2000-11-23 Online:2001-02-24 Published:2001-02-24

关键词: 可控/活性聚合, 梯度聚合, 自由基聚合, 聚丙烯酸, 聚丙烯酰胺

Abstract: There are presently two ways to realize “controlled/living radical polymerization”: one is by a reversible termination or reversible chain transfer to make active polymer chains continuously propagate; the other is by a physical method to suppress chain termination and to prolong radical lifetime. Here we report a new method called Graduation Initiating Radical Polymerization System for realizing “controlled/living radical polymerization”. Its principle and experimental setup are as follows: firstly, initiatable groups(i.e. peroxide groups) were introduced onto the polymer substrates like LDPEfilm by photo-oxidation reaction; secondly, the films carried peroxide groups were put and fixed to the bottom of polymerization bottle containing monomer and solvent. Afterwards, they were made to produce radicals(by heating or reductive agent), and finally the system polymerization was initiated. Once these radicals are produced on the surface of these films, they will undergo three different processes: terminating by combination, diffusing to monomer solution and taking in monomers(polymerizing). The reactive diffusion makes this system produce “two graduation”: one is the graduation of radical concentration(i.e. the farther away from the surface of the film, the lower radical concentration); the other is the length-graduation of living chains,i.e. the farther away from the surface of the film the longer the propagating chains. By this way, we could obtain a polymerization field where the radical concentration is very low and there are no primary free radicals approximately, which are benefit to realize “controlled/living radical polymerization”. This communication reports the first experimental results based on the above idea: with benzophenone(BP) as photo-catalyst and peroxide groups introduced on the LDPEsurface in a concentration 10-8 mol/cm2; by these peroxided films as the sources of free radicals, polyacrylamide and polyacrylic acid were obtained with molecular weights more than 20 millions.

Key words: Controlled/living polymerization, Graduation polymerization, Radical polymerizaion, PAA, PAM

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