申请人:SHANGHAI JIAO TONG UNIVERSITY
公开号:US20210047462A1
公开(公告)日:2021-02-18
A method for synthesizing polyolefin materials with a controlled degree of branching includes the following steps: polymerizing cyclic olefin monomers under catalyst conditions. The cyclic olefin monomer is shown in formula I, where n≥0, n is an integer. By changing monomers and reaction parameters such as reaction temperature, solvent type, catalyst concentration, monomer concentration and reaction time, the degree of branching, the molecular weight and molecular weight distribution of polyolefin can be controlled. Compared with the existing process, the present invention is a new polymerization process, which can prepare the hyperbranched polyolefin with precise and controllable branching structure. The polyolefin material prepared according to the present invention has advantages of a controlled degree of branching, low viscosity and good fluidity, which has broad application in coating, lubricant, polymer and process flow improvement technologies.
一种用于合成具有可控分支度的聚烯烃材料的方法包括以下步骤:在催化剂条件下聚合环烯烃单体。环烯烃单体如式I所示,其中n≥0,n为整数。通过改变单体和反应参数,如反应温度、溶剂类型、催化剂浓度、单体浓度和反应时间,可以控制聚烯烃的分支度、分子量和分子量分布。与现有工艺相比,本发明是一种新的聚合工艺,可以制备具有精确可控分支结构的超支化聚烯烃。根据本发明制备的聚烯烃材料具有可控分支度、低粘度和良好流动性的优点,在涂料、润滑剂、聚合物和工艺流程改进技术中具有广泛应用。