PBAT/PVA复合材料发泡行为及抗收缩性能研究

为提高聚己二酸丁二醇酯-对苯二甲酸丁二醇酯(PBAT)发泡材料的抗收缩性,用热塑性加工的方法制备PBAT/聚乙烯醇(PVA)复合材料,并采用超临界二氧化碳技术制备发泡材料.探讨了PVA含量、发泡温度以及压力对泡孔形貌的影响.流变性能、动态力学分析的结果表明, PVA的加入改善了PBAT熔体的黏弹性,提高了其熔体强度,增强了复合材料的发泡能力.研究结果表明, PVA的加入可提高PBAT的发泡温度,降低发泡材料的收缩率.当PVA含量为10%时,可将发泡温度提高至105℃,稳定体积膨胀率为15倍,体积收缩率仅有1.25%;而此时PBAT的体积膨胀率只有7倍,体积收缩率却达到了78.83%.

Foaming behavior and shrinkage resistance of PBAT/PVA composites

To improve the shrinkage resistance of polybutylene adipate-butylene terephthalate (PBAT) foams, PBAT/polyvinyl alcohol (PVA) composites were made by thermoplastic processing and the foams were prepared by supercritical carbon dioxide technology. The effects of PVA content, foaming temperature and pressure on the cell morphology were investigated. The results of rheological properties and dynamic mechanical analysis showed that the addition of PVA improved the viscoelasticity of PBAT melt, increased its melt strength and enhanced the foaming ability of the composites. The results showed that the addition of PVA could improve the foaming temperature of PBAT and reduce the shrinkage of foaming material. When the PVA content is 10%, the foaming temperature can be increased to 105℃, the final volume expansion ratio is 15 times, whereas the volume shrinkage ratio is only 1.25%; while the final volume expansion rate of PBAT is only 7 times, and the volume shrinkage ratio reaches 78.83%.