Preparation of High Melt Strength Polypropylene and Functionalizations of Its Foaming Materials
The developments of PP foaming technologies are restricted by the low melt strength(MS)of ordinary polypropylene(PP).High melt strength polypropylene(HMSPP)is a long branch chain PP prepared by the introduction of branch chains in the polymerization process.The long branch chain structures could change the strain softening effect of ordinary PP,binging HMSPP with characteristics such as good thermal stability,wide processing temperature range,and good resistance to melt sagging,which could broaden the temperature ranges of PP foaming and improve the performances of PP foams.The concepts,characteristics and characterization methods of HMSPP were introduced in this paper.The research institutions and products of HMSPP at home and abroad were listed.The advantages and disadvantages of HMSPP preparation methods(reaction extrusion method,polymerization,irradiation preparation,crosslinking preparation,blending and modification,etc.)were compared.The foaming methods of HMSPP(extrusion foaming,molded foaming,kettle foaming,injection foaming,blowing foam,etc.)were summarized.The applications and functionalizations of HMSPP(sound insulation,heat insulation,flame retardant,adsorption,etc.)were introduced.Finally,the research directions and applications of HMSPP in the future were presented.In view of the late start of upscale HMSPP research in China,relevant scientific research institutions need to increase their development efforts to develop high-performance and value-added HMSPP products,broadening the application fields of HMSPP and improving their market competitiveness.
High Melt Strength PolypropylenePreparation MethodFoamFunctionalization
万方数据
维普
