Crystalline Structure of Polypropylene Catalloys and Related Influence Factors

Abstract

Abstract:

Crystalline structures of two types of polypropylene catalloys(PP-c) containing different ethylene contents were investigated by differential scanning calorimeter(DSC) and wide-angle X-ray diffraction(WAXD). When the PEP40 containing higher ethylene content crystallizes isothermally in the temperature range investigated, double melting peaks appear in each endotherm region. WAXD measurement evidences that the behavior results from the coexistence of α-form and β-form of PP crystals. The calculated results show that the β-crystal content in PEP40 depends on the crystallization temperature and the β-crystal content of them crystallized at 124℃ approaches the maximum. In addition, the thermal treatment at 220℃ greatly increases the β-crystal content in PEP40 samples and induces the existence of β-crystal in PEP20 samples. Compared with those being treated thermally at 200℃, the PEP20 samples crystallized isothermally at 124℃ after being treated thermally at 220℃ for 30 min exhibit smaller crystalline size and clear morphology of β-spherulite.

Key words: Polypropylene catalloys(PP-c); Crystalline structure; Isothermal crystallization, Polypropylene catalloys(PP-c), Crystalline structure, Isothermal crystallization

CLC Number:

O631

TrendMD:

SHANG Guan-Yong-Gang, ZHENG Qiang, BANG Mao, WANG Hui-Jun, ZHANG Ming-Qiu. Crystalline Structure of Polypropylene Catalloys and Related Influence Factors[J]. Chem. J. Chinese Universities, 2005, 26(12): 2386.

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Crystalline Structure of Polypropylene Catalloys and Related Influence Factors

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