引用本文:
张喜田, 裴奉奎, 焦书科, 胡力平. 钴系催化剂合成液体聚丁二烯的13C-NMR研究——端基、支化结构以及α-烯烃调聚机理[J]. 应用化学,
1986, 3(5): 69-74.
Citation: Zhang Xitian, Pei Fengkui, Jiao Shuke, Hu Liping. 13C-NMR STUDY ON THE LIQUID POLYBUTADIENE SYNTHESIZED BY COBALT BASED CATALYST SYSTEMEND GROUP, BRANCHED STRUCTURE AND MODIFICATION MECHANISM BY α-OLEFINE[J]. Chinese Journal of Applied Chemistry, 1986, 3(5): 69-74.
Citation: Zhang Xitian, Pei Fengkui, Jiao Shuke, Hu Liping. 13C-NMR STUDY ON THE LIQUID POLYBUTADIENE SYNTHESIZED BY COBALT BASED CATALYST SYSTEMEND GROUP, BRANCHED STRUCTURE AND MODIFICATION MECHANISM BY α-OLEFINE[J]. Chinese Journal of Applied Chemistry, 1986, 3(5): 69-74.
钴系催化剂合成液体聚丁二烯的13C-NMR研究——端基、支化结构以及α-烯烃调聚机理
摘要:
本文研究了Co(Nap)2-Al(i-Bu)3-PhCCl3催化体系合成的液体聚丁二烯(PB)的13C-NMR谱以及α-烯烃调节分子量的PB13C-NMR谱,观察到TPB的端基结构,据此探讨了链引发机理,证明了α-烯烃是PB分子量的调节剂。根据化学位移计算和分子量测定结果,确认PB存在支化结构,并探讨了支化机理。
English
13C-NMR STUDY ON THE LIQUID POLYBUTADIENE SYNTHESIZED BY COBALT BASED CATALYST SYSTEMEND GROUP, BRANCHED STRUCTURE AND MODIFICATION MECHANISM BY α-OLEFINE
Abstract:
With the aid of 13C-NMR spectra of liquid polyoutadiene(PB), catalytically synthesized by Co(Nap)2-Al(i-Bu)3 -PhCCl3, some terminal structures of PB Ⅰ-Ⅵ and two branch structures ⅩⅥ and ⅩⅦ have been identified, providing valuable information for chain initiation mechanism. On the basis of branch structure the number average molecular weight of samples was calculated and compared with the result obtained from VPO measurement.The 13C NMR spectra of PB modified by α-olefine reveal that α-ole-fine only modifies the molecular weight of the polymer, it does not copolymerize with butadiene.
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