The influence of stereoregularity of polypropylene on the miscibility with the ethylene−1-hexene copolymer (EHR) whose 1-hexene content is 57 mol % was studied by means of viscoelastic measurements, electron microscopic observation, and so on. In this study, two types of polypropylenes were used; one is an isotactic polypropylene (iPP), and the other is a syndiotactic polypropylene (sPP). The sPP is immiscible with the EHR in both molten and solid states, whereas the iPP is miscible with the EHR in the amorphous region. The difference in the miscibility with the EHR between sPP and iPP depends on the chain stiffness.
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Yamaguchi et al. (1999) studied this question.
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