高等学校化学学报

高等学校化学学报 ›› 2005, Vol. 26 ›› Issue (12): 2386.

• 研究论文 • 上一篇    下一篇

聚丙烯催化合金(PP-c)的晶体结构及其影响因素

上官勇刚1,郑强1,彭懋1,王慧君1,章明秋2   

  1. 1.浙江大学高分子科学与工程学系,杭州310027；2.中山大学材料研究所，广州510275
  • 收稿日期:2005-01-17 出版日期:1905-03-14 发布日期:1905-03-14
  • 通讯作者: 郑强(1960年出生),男,博士,教授,博士生导师,主要从事多组分聚合物体系结构与性能及聚合物流变学研究.E-mail:zhengqiang@zju.edu.cn
  • 基金资助:

    国家自然科学基金重点项目(批准号:50133020)和国家杰出青年基金(批准号:50125312)资助.

Crystalline Structure of Polypropylene Catalloys and Related Influence Factors

SHANGGUAN Yong-Gang1, ZHENG Qiang1*, PENG Mao1, WANG Hui-Jun1, ZHANG Ming-Qiu2   

  1. 1. Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027,China;
    2. Materids Science Znsititude, Sun Yat-Sen University, Guangzhou 510275, China
  • Received:2005-01-17 Online:1905-03-14 Published:1905-03-14
  • Contact: ZHENG Qiang;E-mail:zhengqiang@zju.edu.cn

被引次数

13

摘要：

用差示扫描量热法(DSC)和广角X射线衍射(WAXD)研究了两种乙烯含量不同的聚丙烯反应合金(PP-c)等温结晶下的晶体结构及PPβ晶含量的影响因素.结果表明，在通常的等温结晶条件下,乙烯含量较高的试样(PEP40)的熔融曲线出现双熔融峰.WAXD分析证明,其熔融双峰分别代表均聚聚丙烯(PP)的α晶和β晶.计算结果表明,PEP40中β晶含量与结晶温度有关,124℃结晶时β晶含量最高.在220℃对PP-c熔体进行热处理可显著提高PEP40中β晶的含量;在相同温度下热处理后,较低乙烯含量的试样(PEP20)也出现晶型异构.比较200℃与220℃下热处理对PEP20等温结晶的结晶形态的影响,发现后者使微晶尺寸明显变小,并呈现较完善的β球晶形态.

关键词: 聚丙烯催化合金(PP-c);晶体结构;等温结晶, 聚丙烯催化合金(PP-c), 晶体结构, 等温结晶

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

中图分类号: 

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