Citation: LI Guizhi, YE Meiling, SHI Lianghe. EFFECT OF POLYMERIZATION CONDITIONS ON THE MOLECULAR WEIGHT OF POLYPHENYLSILSISQUIOXANE*[J]. Chinese Journal of Polymer Science, ;1994, 12(4): 331-336. shu

EFFECT OF POLYMERIZATION CONDITIONS ON THE MOLECULAR WEIGHT OF POLYPHENYLSILSISQUIOXANE*

Received Date: 20 November 1993

Samples of polyphenylsilsisquioxane (PPSQ)using CaF2 or MgF2 as the main catalysts hadbeen prepared under different polymerization conditions. The results were treated on anorthogonal design L9 (34). All weight-average molecular weights (MW ) of PPSQ had beenmeasured by gel permeation chromatography (GPC). Effects of polymerization conditionsincluding reaction temperature, composition of the dual catalysts (CaF2 or MgF2 and DCC),mixture of solvents and reaction time on MW of PPSQ have been discussed.The quantity of the catalysts is the most important factor that affects MW of PPSQ.Reaction temperature is the second important factor.Appropriate polymerization condition has been established to get PPSQ with high Mw.
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