GEP/PO原位微纤化共混物的制备

THEORETICAL CONSIDERATION OF THE DROPLET-FIBER TRANSITION IN BLENDS AND PREPARATION OF IN-SITU MICROFIBER-CONTAINED POLYMER BLENDS

利用"熔融挤出-热拉伸-淬冷"方法制备了几种通用工程塑料(GEP)/聚烯烃(PO)原位微纤化共混物,研究了加工设备(挤出机、注塑机、HAAKE流变仪附属单螺杆挤出机)和口模结构(窄缝状、片状、棒状)对聚对苯二甲酸乙二醇酯(PET)/聚乙烯(PE)共混物原位成纤的影响,发现带矩形窄缝状口模的挤出机挤出能产生更好的纤维结构,而有高剪切作用的对空注塑不能形成纤维结构。观察PET/PE,PET/聚丙烯(PP),聚碳酸酯(PC)/PE及PC/PP共混物的成纤情况,发现通常认为不利于成纤(粘度比大于1)的PC/PE和PC/PP体系也形成了较好的纤维形态。总体上,PET/PE的成纤效果好于其它的体系。

The influences of the different processing apparatus (extruder, injection machine and the extruder on the HAAKE rheometer) and the die geometry (slit die, sheet die and rod die) on the fibrillation of several generalpurpose plastics (GEP)/polyolefins (PO) blends, mainly polyethylene terephthalate (PET)/polyethylene (PE) blend, through extrusionhot stretchingquenching method were described. It was found that the extruder with a rectangular slit die can comparatively facilitate to form fibrillar structures, and that the fibers of PET in PE matrix can not be obtained through the injection processing with quite high shear rate. Comparison of the fibrillation of different incompatible polymer blends (PET/PE, PET/polypropylene (PP), polycarbonate (PC)/PE, PC/PP) indicates that the PET/PE blend is desirable, and surprisingly, the PC particles in the PC/PE and PC/PP blends can be deformed into fibers, which is thought to be difficult to form fibers since the viscosity ratio of these two polymer blends are more than 1.