利用挤出成型法制备具有夹芯结构的三层特殊梯度材料

Fabrication of Polymer Blend with Three-layer Special Gradient Sandwich Structure by Extrusion

采用单螺杆挤出成型机和流线形挤出模具,通过高密度聚乙烯(PE-HD)和聚氧乙烯(PEO)的共混挤出,研究了自组装成型三层特殊梯度结构的可能性。实验中挤出成型机和模具的温度设定与生产PE-HD膜时的相同,通过赋予成型物一定的温度梯度AT,并迅速冷却固化定型,成功地制备了PE-HD在表层富集、PEO在断面的中心附近富集的三明治式三层特殊梯度相分离结构材料。并通过偏光显微镜和显微傅立叶变换红外光谱仪分析,明确了挤出成型过程中形成梯度结构的驱动力是由温度梯度引发的热扩散索雷特效应。

Using a single-screw extruder and a streamline type die, the possibility of self-assembly of the A/B/A type three-layer symmetrical structure was explored via the co-extrusion of high-density polyethylene （PE-HD） and poly（ethylene oxide） （PEO）. The temperature profile on the extrusion and die was set as the extrusion of PE-HD. Through applying a temperature gradient △T to the melt extrudate from the die and cool it quickly with sizing equipment, a sandwich structure of PE rich/PEO rich/PE rich was generated via self-assembly. Analysis of polarization microscope and FT-IR spectra revealed that the driving force to the gradient structure was the Soret effect caused by the temperature gradient.