Influence of poly(ethylene glycol)-containing additives on extrusion of ultrahigh molecular weight polyethylene/polypropylene blend
Influence of poly(ethylene glycol)-containing additives on extrusion of ultrahigh molecular weight polyethylene/polypropylene blend
复制标题
含聚乙二醇添加剂对超高分子量聚乙烯/聚丙烯共混物挤出的影响
DOI：
--
复制
发表时间：
2006
期刊：
影响因子：
--
通讯作者：
Huilin Li
中科院分区：
文献类型：
--
作者：
Meiju Xie;Xiaolong Liu;Huilin Li
研究了含聚乙二醇（PEG）的添加剂对超高分子量聚乙烯/聚丙烯（UHMWPE/PP）共混物挤出行为的影响。结果表明，在UHMWPE/PP共混物中加入少量PEG，可显著降低共混物的口模压力和熔体粘度，并显著提高在一定口模压力下的流动速率，而PEG/PEG二元添加剂则可改善UHMWPE/PP共混物的加工性能。当用UHMWPE/PP/PEG共混物挤出口模挤出纯HDPE时，HDPE的挤出压力随挤出时间的延长而逐渐增大。这意味着在UHMWPE/PP/PEG共混物的挤出过程中，PEG可能迁移到模头壁表面并包覆模头壁。FTIR和SEM分析表明，PEG不仅存在于UHMWPE/PP/PEG共混物的表面，而且存在于共混物的内部。因此，在口模壁的外部润滑，结合内部润滑诱导共混物的相间滑移，提出负责口模压力和粘度的降低。此外，一种高分子量的聚硅氧烷和一种含氟聚合物加工助剂被用作UHMWPE/PP挤出的加工助剂作为对照，结果表明，在其建议的负载水平下，仅实现了模头压力和熔体粘度的微小降低效果。© 2006 Wiley Periodicals，Inc.应用聚合物科学杂志100：1282-1288，2006
The influence of poly(ethylene glycol) (PEG)-containing additives on the extrusion behavior of ultrahigh molecular weight polyethylene/polypropylene (UHMWPE/PP) blend was studied. It was found that the addition of small amounts of PEG to UHMWPE/PP blend resulted in significant reduction of die pressure and melt viscosity, and obvious increase of the flow rate at a given die pressure, while PEG/diatomite binary additives enhanced the improvement in the processability of UHMWPE/PP blend. When pure HDPE was extruded with the die through which UHMWPE/PP/PEG blend was previously extruded, the extrusion pressure of HDPE increased with the extrusion time gradually. This meant that PEG might migrate to the die wall surface and coat it in the extrusion of UHMWPE/PP/PEG blend. FTIR spectra and SEM micrographs of the UHMWPE/PP/PEG extrudates indicated that PEG located not only at the surface but also in the interior of the extrudates. So, the external lubrication at the die wall, combined with the internal lubrication to induce interphase slippage of the blend, was proposed to be responsible for the reduction of die pressure and viscosity. In addition, an ultrahigh molecular weight polysiloxane and a fluoropolymer processing aid were used as processing aids in the extrusion of UHMWPE/PP as control, and the results showed that only minor reduction effects in die pressure and melt viscosity were achieved at their suggested loading level. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 1282–1288, 2006