引用本文:
邵华锋, 黄宝琛, 姚薇, 李海霞, 孙全吉, 王卫华. 低相对分子质量反式-1,4-聚异戊二烯蜡的合成[J]. 应用化学,
2003, 20(5): 447-451.
Citation: SHAO Hua-Feng, HUANG Bao-Chen, YAO Wei, Li Hai-Xia, SUN Quan-Ji, WANG Wei-Hua. Synthesis of Trans-1,4-Polyisoprene Wax with Low Relative Molecular Mass[J]. Chinese Journal of Applied Chemistry, 2003, 20(5): 447-451.
Citation: SHAO Hua-Feng, HUANG Bao-Chen, YAO Wei, Li Hai-Xia, SUN Quan-Ji, WANG Wei-Hua. Synthesis of Trans-1,4-Polyisoprene Wax with Low Relative Molecular Mass[J]. Chinese Journal of Applied Chemistry, 2003, 20(5): 447-451.
低相对分子质量反式-1,4-聚异戊二烯蜡的合成
摘要:
以H2气作为相对分子质量调节剂,采用MgCl2负载TiCl4催化体系催化异戊二烯溶液淤浆聚合及本体沉淀聚合,合成低相对分子质量反式-1,4-聚异戊二烯蜡。研究了聚合条件如H2气分压、聚合温度、时间、催化剂用量等对相对分子质量、催化剂效率和聚合物结构的影响。结果表明,H2气能明显调节聚合物的相对分子质量。当H2气分压为24MPa时,聚合物的特性粘数降至0.23dL/g,相应粘均相对分子质量为3800,数均相对分子质量约为1000。结构分析表明,所得聚合物反式-1,4-结构摩尔分数为92%以上,结晶度30%左右。聚合物相对分子质量分布指数ID为50~80。
English
Synthesis of Trans-1,4-Polyisoprene Wax with Low Relative Molecular Mass
Abstract:
The solution polymerization and bulk precipitation polymerization of isoprene with supported titanium catalyst TiCl4/MgCl2-Al(i-Bu)3 using hydrogen as relative molecular mass modifier have been carried out in order to synthesis low relative molecular mass trans-1,4-polyisoprene wax (LMTPIW).The effects of hydrogen pressure,n(Al)/n(Ti),n(Ti)/n(Ip),and polymerization time and temperature on the relative molecular mass,catalyst efficiency and structure of polymer were studied.Increasing the hydrogen pressure results in the decrease of intrinsic viscosity of the polymer [η].The [η],viscosity average relative molecular mass and number average relative molecular mass were found to be decreased to 0.23 dL/g,3800 and 1000,respectively,when H2 pressure was increased to 2.4 MPa.The x(trans-1,4-unit) in the polymer was over 92%.The crystallinity of the polymer was ca.30% with Tm being 50~55℃.The relative molecular mass distribution index (ID) was 50~80.
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Key words:
- isoprene
- / supported titanium catalyst
- / coordination polymerization
- / hydrogen
- / oligomer
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