利用废弃PET酯交换法合成PBAT的研究

以废弃聚对苯二甲酸乙二醇酯（PET）矿泉水瓶为原料，采用酯交换法获得聚对苯二甲酸丁二醇酯（PBT）预聚体，再与聚己二酸丁二醇酯（PBA）共聚获得聚对苯二甲酸/己二酸丁二醇酯（PBAT）产物，通过核磁共振光谱仪、红外光谱仪、热重分析仪、差示扫描量热分析仪和万能试验机等对PBAT产物的结构和性能进行了分析表征。结果表明，PBAT产物的热稳定性良好，300 ℃以内不会热分解；PBAT产物的水接触角是78.54°，是一种亲水材料；PBAT产物的断裂伸长率达到900 %以上，具备进一步应用推广的可能性。

Synthesis of PBAT through transesterification with discarded PET

Poly（ethylene terephthalate?co?butylene adipate） （PBAT） was prepared through transesterification using waste poly（ethylene terephthalate） （PET） as a raw material. The structure and compositions of the PBAT products were determined by nuclear magnetic resonance and infrared spectroscopy， and their thermal properties were investigated using TGA and DSC. The contact angle of PBAT was measured by a five?point method， and their tensile properties were measured using a universal test machine. The results indicated that there was no thermal decomposition occurring below 300 ºC for the PBAT products. This is an indication of good heat resistance. The PBAT developed in this work exhibited a contact angle of 78.54º， indicating a good hydrophilic nature. Moreover， the PBAT presented elongation at break of over 900 %， indicating a good application potential.