摘要
四氢呋喃聚合向丁二酸酐链转移的研究栗方星，马克勤，陈琰，文佳，霍玉杰（南开大学化学系，天津，３０００７１）（天津安普公司，天津）关键词ＴＨＦ，ＴＤＩ，ＣＨ_３ＣＯＳｂＣｌ_６，表观聚合速率常数在ＴＨＦ阳离子聚合的过程中，活性中心向丁二酸酐链转移［１］可...
During the polymerization process of THF, active center can transfer to succinic anhydride and produce polyether-ester block copolymer.If TDI is added into the system,the relative velocity of polymerization and chain transfer reaction can be controlled.It is found that when the molar ratio of TDI/catalyst is 1, the polymerization can be accelerated , while the transfer rate decreases during the latter period of the reaction . However, when this ratio is 5/1, the propagation rate changes little, but the transfer rate increases. In the systems without TDI, with one time and five times moles of TDI as the mole of catalyst at 8℃, the apparent propagation rate constants of THF, kp are 5. 55×10￣(-3),7. 10× 10￣(-3) and 8.10×10￣(-3) L/(mol·s), respectively; the transfer rate constants k_(tr) are 1.33 × 10￣(-3),0.43 × 10￣(-3) and 5. 55×10￣(-3) L/(mol·s), respectively.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1996年第9期1492-1494,共3页
Chemical Journal of Chinese Universities
