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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. shu

Synthesis of Trans-1,4-Polyisoprene Wax with Low Relative Molecular Mass

1.
College of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042

Corresponding author: HUANG Bao-Chen,
Received Date: 18 September 2002
Available Online: 31 December 2002
Fund Project: 国家自然科学基金资助项目(20274021) (20274021)

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 T_m being 50~55℃.The relative molecular mass distribution index (I_D) was 50~80.
- isoprene,
- supported titanium catalyst,
- coordination polymerization,
- hydrogen,
- oligomer
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Synthesis of Trans-1,4-Polyisoprene Wax with Low Relative Molecular Mass

南开大学师唯/华北电力大学（保定）刘景维：二维配位聚合物中有序的亲锂冠醚位点用于无枝晶锂沉积

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通讯作者: 陈斌, bchen63@163.com