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Effects of a novel nucleating agent bicyclic [2,2,1] heptane di-carboxylate (HPN-68) on the properties, crystallization, and melting behavior of isotactic polypropylene (iPP) were studied. The results showed that HPN-68 is a typical nucleating agent for α-iPP and it has high nucleation efficiency. Addition of a small amount of HPN-68 to iPP can obviously increase crystallization peak temperature and mechanical properties of iPP. When the concentration of HPN-68 is 0.2 wt.%, the crystallization peak temperature can be increased by about 15°C, and the tensile strength and flexural modulus of iPP can be increased by 12.74% and 18.24%, respectively.
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Li et al. (2009) studied this question.
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