Rheological behavior of PET/HDPE in situ microfibrillar blends: Influence of microfibrils' flexibility
Rheological behavior of PET/HDPE in situ microfibrillar blends: Influence of microfibrils' flexibility
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DOI：
10.1002/polb.21113
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发表时间：
2007-05
期刊：
影响因子：
--
通讯作者：
Hong-Sheng Xu;Zhong‐Ming Li;Songlin Wang;Ming‐bo Yang
中科院分区：
文献类型：
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作者：
Hong-Sheng Xu;Zhong‐Ming Li;Songlin Wang;Ming‐bo Yang
采用狭缝模挤压-热拉伸-淬火工艺制备了聚对苯二甲酸乙二醇酯(PET)/高密度聚乙烯（HDPE）原位微纤维增强共混物。原位PET微纤维含有不同含量的分段热塑性弹性体Hytrel 5526 (HT)，因此具有不同的柔韧性，动态力学分析表明。有趣的是，简单的混合会导致PET相中HT相的纳米级颗粒，并且HT颗粒的大小几乎与HT浓度无关，从扫描电镜显微图中可以看出，不同HT浓度的微原纤维直径几乎相同，表面光滑。采用先进的毛细管流变仪对微纤维共混物进行静态流变实验，结果表明，微纤维的入口压降和粘度随微纤维柔韧性的增加而减小。此外，通过动态流变仪对PET/HT/HDPE微纤维共混物进行温度扫描得到的数据表明，微纤维柔韧性越强，共混物的熔体弹性越低，共混物的粘度也会略有下降，这与静态流变仪测量的微纤维柔韧性对流变行为的影响结论一致。©2007 Wiley期刊公司[J] .高分子材料工程学报，2009,31 (4):559 - 567
Poly(ethylene terephthalate) (PET)/high-density polyethylene (HDPE) in situ microfibrillar reinforced blends were prepared via a slit die extrusion-hot stretch-quenching process. The in situ PET microfibrils contain various contents of a segmented thermoplastic elastomer, Hytrel 5526 (HT), hence having different flexibility as demonstrated by dynamic mechanical analysis. It is interesting that the simple mixing leads to nanoscale particles of the HT phase in PET phase, and the size of the HT particles is almost independent of the HT concentration, as observed from the scanning electron microscope micrographs which show that the microfibrils with different HT concentrations have almost the same diameter and smooth surfaces. The static rheological results by an advanced capillary rheometer show that the entrance pressure drop and the viscosity of the microfibrillar blends both reduced with increasing the microfibrils' flexibility. Furthermore, the data obtained by the temperature scan of the PET/HT/HDPE microfibrillar blends through a dynamic rheometer indicates that the more flexible microfibril leads to lower melt elasticity and slightly decreases the viscosities of blends, presenting a consistent conclusion about influences of the microfibrils' flexibility on the rheological behavior from the static rheometer measurements. © 2007 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 45: 1205–1216, 2007