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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)。
In the melt stretched films of iPP and HDPE blends, the two components are in the form of highly oriented lamellae, and the growth direction of the lamella is perpendicular to the stretching direction. When the content of iPP is less than 20%, there is no obvious iPP phase. When the content of iPP is 40-60%, the two components form the continuous phase respectively. When the content of iPP is more than 70%, the HDPE is dispersed. The addition of iPP reduced the lamella width of HDPE and affected the symmetry of the structure, that is, the asymmetric near-single crystal structure of pure HDPE changed into a symmetrical fiber structure. At higher film forming temperatures (135-140 ° C) and lower HDPE content (less than 30%), HDPE crystallizes on the iPP. The c-axes of the two platelets form an angle of 45 ° -50 °. The epiphytic crystalline contact surfaces are HDPE (100) and iPP (010).