但由于PP的高结晶性，熔体强度低，其发泡成型较为困难。
Nevertheless foaming processing of PP is very difficult because of its high crystallinity and poor melt strength.
结果表明：在橡塑表面能相近的条件下，选择分子量大且结晶度高的PP作为基体组分，同时选择具有适宜交联速率硫化体系作为橡胶相的交联组分制备的TPV性能最佳。
The results showed that it was better for producing the EPDM/PP TPV by selecting a high molecular weight resin, a suitable crosslinking system and optimum mixing conditions.
然而聚丙烯塑料本身极性低，结晶化程度高，要形成具有良好附着力的涂层相当困难。
A one coat paint based on this modified resin has been formulated, which shows good comprehensive properties and find applications for PP plastic parts in cars, etc.
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