Citation:
Fang Tianru, Yu Li, Liu Zhaoyan, Xu Yulun, Han Jitang, Liu Hanliang, Liang Shangjin, Wei Tongcheng. SYNTHESIS OF ALLYLTERMINATED POLYDIME-THYLSILOXANES AND THEIR BEHAVIOR IN ETHYLENE POLYMERIZATION[J]. Chinese Journal of Applied Chemistry,
;1986, 3(5): 79-81.
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Allyl-ended polydimethylsiloxanes (allyl-PDMS)were synthesized via anionic poly merization of octamethylcyclotetrasiloxane (D4), either by using potassium allyl alcoxide 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 polymerization 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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