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Using water to modify the localization of clay in immiscible polymer blends

机译：使用水改变粘土在不混溶的聚合物共混物中的定位

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摘要

Bio-based polyamide 11 (PA11) and water-soluble polyethylene oxide (PEO) (80/20 wt/wt) were used to prepare an immiscible polymer blend. Ternary systems containing 1 wt% hydrophilic clay (organomodified or native clay) were elaborated using extrusion with and without injection of water. The cryoscopic effect on PA11 and PEO observed by high pressure differential scanning calorimetry indicated that they were both miscible with water under conditions of water-assisted extrusion. Transmission electron microscopy revealed a selective localization of both types of clay in the matrix (PA11). However, with water-assisted extrusion a part of the organomodified clay platelets was localized into the dispersed phase (PEO). Under rheological tests, the unmodified clay exhibited a different effect compared with the organomodified clay on the modulus and viscosity of the blend. The van Gurp-Palmen plot indicated that clay potentially decreased the interfacial tension between PA11 and PEO, while the weighted relaxation spectra confirmed that water improved the dispersion state of the clay and limited the polymer degradation. Thermogravimetric analyses showed that the presence of clay and water improved the thermal stability of PA11/PEO blends. Our work is the first one which has realized water-assisted extrusion of a clay-filled ternary blend.
机译：使用生物基聚酰胺11（PA11）和水溶性聚环氧乙烷（PEO）（80/20 wt / wt）制备不混溶的聚合物共混物。含有和不含有水的挤出方法，对含有1 wt％亲水性粘土（有机改性或天然粘土）的三元体系进行了精细加工。通过高压差示扫描量热法观察到的对PA11和PEO的冷冻作用表明，它们在水辅助挤出条件下均与水混溶。透射电子显微镜显示基质（PA11）中两种粘土的选择性定位。然而，在水辅助挤出的情况下，一部分有机改性的粘土片状体被定位在分散相（PEO）中。在流变测试中，与有机改性的粘土相比，未改性的粘土在共混物的模量和粘度方面表现出不同的效果。 van Gurp-Palmen曲线表明，黏土潜在地降低了PA11和PEO之间的界面张力，而加权弛豫谱证实水改善了黏土的分散状态并限制了聚合物的降解。热重分析表明，粘土和水的存在改善了PA11 / PEO共混物的热稳定性。我们的工作是第一个实现水辅助挤出粘土填充三元共混物的工作。

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