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本文用透射电子显微术、电子衍射等方法研究了线性低密度聚乙烯(LLDPE)和等规聚丙烯(IPP)共混物高取向薄膜的形态结构.在熔体拉伸薄膜中统组分的LLDPE与IPP均以高取向的片晶形式存在,片晶生长方向垂直手拉伸方向.当共混物中LLDPE含量较低(小于40％)时,作为分散相的LLDPE在IPP上附生结晶.两种片晶的c轴成45°交角,附生结晶的接触面为LLDPE的(100)和IPP的(010).而在LLDPE含量大于50％时,LLDPE形成独立的相区,则不存在附生结晶现象,结果两种片晶的生长方向均垂直于拉伸方向.在135℃热处理15min,然后自然冷却的LLDPE/IPP共混物薄膜中,当LLDPE含量≤50％时,LLDPE仍然在IPP上附生生长,二者的结构关系与热处理前的相同.
In this paper, the morphologies and structures of highly oriented films of linear low density polyethylene (LLDPE) and isotactic polypropylene (IPP) blends were investigated by means of transmission electron microscopy and electron diffraction. In the melt drawn films, LLDPE and IPP both exist in the form of highly oriented lamellae and the growth direction of the lamellae is perpendicular to the direction of hand stretching.When LLDPE content in blends is low (less than 40%), LLDPE as disperse phase is attached to IPP Crystallized.The c-axes of the two kinds of lamellae were at 45 ° angle, and the contact surface of epiphytes was (100) of LLDPE and (010) of IPP.When the content of LLDPE was more than 50%, LLDPE formed an independent phase region, There is no epiphytic crystallization phenomenon, the results of the growth direction of the two lamellae are perpendicular to the direction of stretching at 135 ℃ heat treatment 15min, and then naturally cooled LLDPE / IPP blend film, when the LLDPE content ≤ 50%, LLDPE Is still epiphytic growth on the IPP, the structural relationship between the two and heat treatment before the same.