论文部分内容阅读
聚丙烯釜内合金具有良好的刚韧平衡性能,历经30多年的发展,在包装、汽车和建筑等领域已得到广泛的应用。其优异的性能及复杂的多相、多组分结构更是引起了相关领域研究者的高度关注。聚丙烯釜内合金是一种在聚合釜内直接合成的多相、多组分聚合物体系,其初始产品常以粉末或球型颗粒的状态存在,具有非常复杂的相形态,并且在加工成型过程中,由于相形态的演变会形成更加丰富的微结构,从而对聚丙烯釜内合金最终的力学性能产生决定性的影响。目前对于聚丙烯釜内合金体系的分子链结构-聚集态结构-产品性能之间的构效关系仍然有很多问题亟待解决。近期研究表明在某些情况下,聚丙烯釜内合金体系中增韧相形成“核-壳”型结构(或多重“核-壳”型结构)时,可以实现最佳的刚性与韧性的平衡,但对于这些“核-壳”结构形成条件的控制及结构成分的精确测定仍有不足。本文主要总结了近年来聚丙烯釜内合金相态研究的进展,展望了该领域可能的发展方向。
Polypropylene autoclave alloy has good stiffness and toughness balance performance, after 30 years of development, in the packaging, automotive and construction fields have been widely used. Its excellent performance and complex multi-phase, multi-component structure is caused by the researchers in the field of concern. Polypropylene autoclave alloy is a multi-phase, multi-component polymer system synthesized directly in polymerizer, the initial product is often in the form of powder or spherical particles, has a very complex phase morphology, and in the process of forming In the process, due to the evolution of phase morphology, a more abundant microstructure will be formed, which will have a decisive influence on the final mechanical properties of the alloy in the polypropylene reactor. At present, there are still many problems to be solved in the structure-activity relationship between the molecular chain structure of the alloy system in the polypropylene reactor, the aggregation structure and the product performance. Recent studies have shown that in some cases, the toughening phase in the polypropylene system in the autoclave can achieve the best rigidity when forming a “core-shell” structure (or multiple “core-shell” And toughness balance, but for these “core - shell ” structure formation control of the conditions and the precise determination of structural components is still inadequate. This article summarizes the recent progress in the study of the alloy phase morphology in polypropylene autoclaves and prospects the possible direction of development in this area.