β晶等规聚丙烯的制备原理和研究进展

摘要

β-Modified isotactic polypropylene(β-iPP) is one of the most important polypropylene resins and finds wide applications in pipes,films and microwave containers for its improved impact strength,excellent tensile property and high distortion temperature. Most of these properties are derived from the specificβ-spherulite structure,βα-recrystallization andβ-αtransition behavior. The crystal structure,resin properties and preparation principle of the crystal-modified iPP,especially the β-modified iPP,were reviewed,with a special focus on the research progresses in the β-iPP preparation viaβ-nucleator blending techniques. The application ofβ-iPP was introduced based on its properties,and its future prospect was discussed and forecasted.%β晶等规聚丙烯（β-iPP）作为聚丙烯树脂的重要品种，具有优良的抗冲击性能、延展性能和高的热变形温度，在管材、薄膜、微波加热容器等领域有着广泛应用。β-iPP特有的球晶结构、βα-再结晶现象和β-α晶型转变特性等是赋予其优良性能的内在原因。综述了不同晶型聚丙烯特别是β-iPP的结构、性能特点及制备原理，重点介绍了成核剂共混法制备β-iPP的研究进展和趋势，并基于β-iPP的性能特点介绍了其主要应用领域，对β-iPP的发展趋势提出了展望。