论文部分内容阅读
利用微纳叠层挤出成型设备制备了1层、9层和81层的单一聚烯烃PP材料,且成型设备由实验室自主研发。通过对其力学性能、DSC和热台偏光显微镜的测试,研究了微纳叠层挤出成型方法对PP材料性能的影响。研究结果表明:通过扭转叠层单元所产生的剪切场使高分子链的取向度和材料的结晶度均得到大幅度提升,晶粒尺寸明显细化;9层、81层试样的结晶度较1层试样分别提高了2.70%、7.57%;晶粒尺寸较1层相比分别缩小了30、42μm;在挤出方向上,9层、81层试样的拉伸强度较1层分别提高了6.73%、16.18%;在垂直于挤出方向上,9层、81层的横向拉伸强度较1层分别提高了10.30%、17.15%,类似于双轴拉伸的效果。
The first, the ninth and the 81st layers of single polyolefin PP material were prepared by the micro / nano extrusion extrusion molding equipment, and the molding equipment was independently developed by the laboratory. The mechanical properties, DSC and hot stage polarization microscope were used to test the effect of micro / nano extrusion extrusion on the properties of PP. The results show that the orientation of the polymer chain and the crystallinity of the material are greatly improved by the shear field generated by the reversal of the laminated units, and the grain size is obviously refined. The crystallinity of the nine layers and 81 layers Which is 2.70% and 7.57% higher than that of the first layer respectively. The grain size is reduced by 30 and 42μm respectively compared with that of the first layer. In the extrusion direction, the tensile strengths of the ninth and eighth layers are respectively Which is 6.73% and 16.18% higher than that of the first layer. In the direction perpendicular to the extrusion direction, the transverse tensile strengths of the ninth and the eighth layers are increased by 10.30% and 17.15% respectively compared with that of the first layer, similar to the biaxial stretching.