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采用实验室自主设计的微纳层叠挤出成型设备,制备了1层、9层和81层的线性低密度聚乙烯(LLDPE)实验样品,并对不同层数的样品进行取向度、结晶度以及拉伸强度测试,主要研究了微纳层叠技术对聚合物分子链取向、结晶度以及拉伸强度的影响。实验结果表明:通过微纳层叠技术,提高了LLDPE的结晶度,9层、81层LLDPE的结晶度较1层LLDPE结晶度的38.56%分别提高到50.62%和54.42%;同时还提高了LLDPE沿挤出方向(MD)和垂直于挤出方向(TD)的取向度和拉伸强度,具有双向拉伸作用,且扭转层叠单元的使用个数越多,双向拉伸效果越明显。
The first, the ninth and the eighth layers of linear low density polyethylene (LLDPE) experimental samples were prepared by laboratory-designed micro-nano-layer extrusion molding equipment. The degree of orientation, crystallinity, Tensile strength test, the main study of micro-nanolaminate polymer chain orientation, crystallinity and tensile strength. The experimental results show that the crystallinity of LLDPE is improved by the micro-nano lamination technology, the crystallinity of LLDPE of layer 9 and layer 81 is increased to 50.62% and 54.42% respectively from that of 1 layer of LLDPE, and the crystallinity of LLDPE of layer 9 is increased to 50.62% and 54.42% The degree of orientation and the tensile strength in the extrusion direction (MD) and perpendicular to the extrusion direction (TD) have a biaxial stretching action, and the more the number of the twisted layering units is used, the more the biaxial stretching effect is more pronounced.