The microstructure of powder material and its ag-glomeration material of two types of linear low density polyethy-lene(LLDPE)2720 and 7042 produced by Unipol gas phase polymerization process were characterized and the agglomera-tion mechanism was analyzed.The results showed that the melt-ing point and degree of crystallinity of agglomeration polyethy-lene decreased,the crystallization temperature,relative molecular weight and melting flow rate were basically the same.The two kinds of LLDPE powder had a strong sense of particles,and agglomeration polyethylene resulted from the fine particles melting and bonding into a block,which contained the bubble structure of gas wrapped in the polymer melt.The agglomeration formation was mainly due to the dual action of particle electro-static adsorption of the diffusion segment and butene insertion to reduce the melting temperature of polyethylene.
关键词
线性低密度聚乙烯/气相聚合/粉料/块料/结晶/相对分子质量
Key words
linear low density polyethylene/gas phase polymerization/powder/agglomeration/crystallization/rela-tive molecular weight
维普
万方数据