%0 Journal Article
%T KINETIC STUDIES OF THE ANIONIC RING-OPENING POLYMERIZATION OF HEXAMETHYLCYCLOTRISILOXANE(D3) INITIATED BY HEXAPHENYLCYCLOTRISILAZANE TRILITHIUM<br>硅氮负离子引发六甲基环三硅氧烷开环聚合的动力学研究
%A FAN Zhaodong
%A XIE Zemin
%A <br>范召东
%A 谢择民
%J 高分子学报
%D 2007
%I 
%X The kinetics of the anionic ring-opening polymerization of hexamethylcyclosiloxanes (D_3) initiated by hexaphenylcyclotrisilazane trilithium(P_3~ NLi ),in the presence of DMSO or THF as a promoter was studied.The conversion of D_3 at different reaction time was determined from the ratio of the peak area of the NMR spectrum of D_3 to that of the polymer.The reaction orders for THF,DMSO,D_3 and P_3~ NLi were calculated.The polymerization is a reaction of 1~ st order with respect to D_3,THF and P_3~ NLi ,and 2~ nd order with respect to DMSO.The kinetic equations of the polymerization reactions were also proposed.The kinetics of THF and DMSO is v_p=-dD_3]/dt=kI]D_3]THF] and v_p=-dD_3]/dt=kI]D_3]DMSO]~2, respectively.The accelerating effect of DMSO was stronger than that of THF,and the rate constant of polymerization with DMSO as promoter was nearly 100 times as high as that of THF.
%K Hexaphenylcyclotrisilazane trilithium (P_3~NLi)
%K Conversion of D_3
%K Kinetics
%K The accelerating effect<br>六苯基环三硅氮烷三锂盐(P3NLi)
%K D3的转化率
%K 反应级数
%K 动力学方程
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=6579068328FE643F&jid=15971983683C7643EE80F1CE621DEB60&aid=1D1C01681E2FACB2&yid=A732AF04DDA03BB3&iid=E158A972A605785F&sid=35E8A259891FB32F&eid=5DCBAAB000A70168&journal_id=1000-3304&journal_name=高分子学报&referenced_num=0&reference_num=12