中华医学超声杂志

应用化学 ›› 1990, Vol. 0 ›› Issue (1): 43-48.

• 研究论文 • 上一篇    下一篇

聚丙烯/聚乙烯共混物高取向薄膜的形态结构研究

刘筱春, 杨德才, 冯之榴   

  1. 中国科学院长春应用化学研究所 长春 130022
  • 收稿日期:1989-02-01 修回日期:1989-05-13 出版日期:1990-02-10 发布日期:1990-02-10

ON THE MORPHOLOGY OF HIGHLY ORIENTED FILMS OF iPP/HDPE BLENDS

Liu Xiaochun, Yang Decai, Feng Zhiliu   

  1. Changchun Institute of Applied Chemistry, Academia Sinica, Changchun 130022
  • Received:1989-02-01 Revised:1989-05-13 Published:1990-02-10 Online:1990-02-10

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摘要： 在等规聚丙烯(iPP)与高密度聚乙烯(HDPE)共混物的熔体拉伸薄膜中,两组份均以高取向的片晶形式存在,片晶生长方向垂直于拉伸方向。当iPP含量小于20%时,无明显的iPP相区存在;在iPP含量为40—60%时,两组份各自形成继续相,而在iPP含量大于70%时,HDPE以分散相存在。iPP的加入,使HDPE的片晶宽度减小,同时影响其结构的对称性,即由纯HDPE的非对称近单晶结构变为对称的纤维结构。 在制膜温度较高(135—140℃),HDPE含量较低(小于30%)时,HDPE在iPP上附生结晶。两种片晶的c轴成45°—50°交角,附生结晶的接触面为HDPE的(100)和iPP的(010)。

关键词: 聚丙烯, 聚乙烯, 共混物, 形态, 附生结晶

Abstract: The morphology of highly oriented melt-drawn films of iPP/HDPE blends has beeninvestigated by TEM and DSC. Both the HDPE and the iPP in the films consist of hig-hly oriented crystalline lamellae. Blending iPP with HDPE results in decrease of crystalline width and melting point of HDPE, as well as the change of HDPE texture from asingle crystal texture to fibre symmetric structure. No marked phases of iPP were foundin the films at low iPP contents(<20%). Individual phases of iPP were observed at iPPcontents>30%.There is no sharp boundary between the two phases. The lamellae of HDPEand iPP in the boundary region are higher interpenetrating or connecting each other. When the preparation temperature of the film is higher(135-140℃)and the content ofHDPE in the blends is below 30%, epitaxial growth of HDPE lamellae on highly orientediPP lamellae has been observed. The intercrossing angle of the two kinds of epitaxial lamellae is about 45°-50°, while the contact planes are(010)of iPP and(100)of HDPE.

Key words: polypropylene, polyethylene, blends, morphology, epitaxy

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