Chinese Journal of Applied Chemistry

Chinese Journal of Applied Chemistry ›› 1986, Vol. 0 ›› Issue (5): 79-81.

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SYNTHESIS OF ALLYLTERMINATED POLYDIME-THYLSILOXANES AND THEIR BEHAVIOR IN ETHYLENE POLYMERIZATION

Fang Tianru1, Yu Li1, Liu Zhaoyan1, Xu Yulun1, Han Jitang2, Liu Hanliang2, Liang Shangjin2, Wei Tongcheng2   

  1. 1. Changchun Institute of Applied Chemistry, Academia Sinica;
    2. Institute of Liaoyang Petrochemical Fibre Complex
  • Received:1985-12-18 Revised:1986-03-17 Published:1986-10-10 Online:1986-10-10

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Abstract: Allyl-ended polydimethylsiloxanes (allyl-PDMS)were synthesized via anionic poly merization of octamethylcyclotetrasiloxane (D4), either by using potassium allyl alco-xide as initiator or by adding allyl bromide as chain terminator. The influence of allyl-PDMS on the polymerization of ethylene in Al(C2H5)3-TiCl4-Mg(OC2H5)2 catalyst system was investigated. It was found that the addition of a small amount of allyl-PDMS improved the catalyst activity in the whole polymeriza-tion course examined, resulting in an apparent increase of the yield of polyethylene.However, larger amounts of allyl-PDMS added detracted the activity of the catalyst system, and the lower the molecular weight of allyl-PPMS, the stronger the negative effect on the catalyst activity,

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