可生物降解聚己二酸-对苯二甲酸丁二酯/聚碳酸丁二酯共混物的制备及其性能

Preparation and Characterization of Biodegradable Poly(butylene adipate-co-terephthalate)/Poly(butylene carbonate)Blends

以环氧大豆油(ESO)作为聚己二酸-对苯二甲酸丁二酯(PBAT)和聚碳酸丁二酯(PBC)的增容剂,采用熔融共混法制备了一系列PBAT/PBC/ESO复合材料.通过相关表征研究了ESO含量和PBC含量对PBAT/PBC复合材料微观结构和性能的影响.结果表明,ESO中的环氧基团通过与PBAT和PBC的端基发生开环反应,可以提高PBAT与PBC的相容性,提升了复合材料的结晶性能、热稳定性和延展性.当复合材料中ESO含量由0%增加到7.0%时,ESO对复合材料还表现出优异的增塑性能,获得PBAT/PBC复合材料的断裂伸长率由353%提高到805%.另外,PBC的添加可以显著改善PBAT/PBC复合材料的阻隔性能和刚性,因此可以通过改变PBC的含量来调控复合材料的力学性能和阻隔性能.

To address the challenges associated with the inadequate barrier properties and reduced elastic modulus of poly(butylene adipate-co-terephthalate)(PBAT),a series of PBAT/poly(butylene carbonate)(PBC)/epoxidized soybean oil(ESO)composites were prepared by melt blending ESO as a compatibilizer and PBC as the second component with PBAT.The effects of ESO content and PBC content on the thermal properties,crystallization properties,mechanical properties,and barrier properties of the composite materials were investigated through Fourier transform infrared spectroscopy(FTIR),thermogravimetric analysis(TGA),differential scanning calorimetry(DSC),X-ray diffraction(XRD),scanning electron microscopy(SEM)and other relevant characterization tools.Additionally,the compatibility mechanism of ESO on the composite materials was discussed.The results demonstrated that the epoxy groups in ESO enhanced the compatibility of PBAT and PBC through a ring-opening reaction with the end groups of PBAT and PBC.Furthermore,the crystallization properties and thermal stability of the composites were improved.SEM images showed that the delamination in the composites disappeared after the addition of ESO,and a linear fiber structure appeared,further proving the compatibility enhancement.At the same time,the addition of ESO significantly improved the ductility of the composites.The elongation at break of PBAT/PBC composites increased from 353% to 805% when the ESO content in the composites increased from 0% to 7.0%;meanwhile,PBC and ESO show an excellent synergistic effect in improving the elongation at break of the composite materials.In addition,the addition of PBC can significantly improve the barrier properties and stiffness of PBAT/PBC composites.The oxygen and water vapor barrier properties of composites increased by 73% and 64.7%,respectively,as the PBC content increased from 0 wt% to 80 wt%.Furthermore,the modulus of elasticity increased by 254%.The comprehensive performance of PBAT was notably improved through the incorporation of PBC and ESO as modifying materials,thereby promising to broaden the application fields of PBAT.