A facile chain extension and solid-phase batch foaming method was proposed to prepare microcellular poly (butylene adipate-co-terephthalate) (PBAT) foams in the presence of supercritical CO₂. Branching structure and micro cross-linking structure were generated in modified PBAT with styrene-acrylonitrile-glycidyl methacrylate terpolymer (SAG) as chain extender, which was confirmed by Fourier transform infrared spectra, gel permeation chromatography and gel fraction measurements. The intrinsic viscosity and branching degree of modified PBAT increased as well as their viscoelasticity was improved respectively, with the SAG content increasing. The crystallization temperature and crystallinity of various PBAT samples increased and then decreased slightly due to the heterogeneous nucleation effect of branching points and the generation of cross-linking structure. An interesting complex cellular structure was observed in modified PBAT foams with the SAG content of 1 and 3 wt%, owing to the different rheological properties in branching molecular chain regions and linear molecular chain regions.

提出了一种简便的扩链固相间歇发泡方法，以在超临界CO ₂存在下制备微孔聚己二酸丁二醇酯-对苯二甲酸对苯二甲酸酯（PBAT）泡沫。。在改性PBAT中，以苯乙烯-丙烯腈-甲基丙烯酸缩水甘油酯三元共聚物（SAG）为增链剂，生成了支链结构和微交联结构，这通过傅立叶变换红外光谱，凝胶渗透色谱法和凝胶分数测定得到了证实。随着SAG含量的增加，改性PBAT的特性粘度和支化度分别提高，粘弹性提高。由于支化点的异质成核作用和交联结构的产生，各种PBAT样品的结晶温度和结晶度先升高后降低。在改性的SBAT含量为1和3 wt％的PBAT泡沫中观察到了有趣的复杂泡孔结构，