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全同立构聚丙烯(I-pp)是一种具有复杂多晶型结构的聚合物,在不同结晶条件下可生成α,β,γ,σ等晶型.聚丙烯的晶型及其转变一直是国内外学者研究的热点.研究聚丙烯各晶型间的相互关系及出现新晶型的可能性,对于探索聚丙烯结构和性能的关系具有重要意义.我们用自制的高压装置将以往聚丙烯高压结晶的压力从0～0.70GPa扩展至尚未见有文献报道的0～2.30GPa,并在pp中加入少量成核剂进行高压结晶.发现了一些有关pp晶
Isotactic polypropylene (I-pp) is a kind of polymer with complex polymorphic structure and can produce α, β, γ, σ and other crystal forms under different crystallization conditions. It has always been a hot topic both at home and abroad.Researching the interrelationship between polypropylene crystal forms and the possibility of new crystal appearance is of great significance to explore the relationship between structure and properties of polypropylene.We used the homemade high- The pressure of high pressure crystallization of propylene has been extended from 0 ~ 0.70GPa to 0 ~ 2.30GPa which has not been reported in the literature, and a small amount of nucleating agent is added to PP for high pressure crystallization.