目的 为提升聚己二酸丁二醇酯和对苯二甲酸丁二醇酯(PBAT)超临界二氧化碳(CO2)发泡性能，探究复合泡沫在疏水隔热可降解包装领域的应用。方法 使用硅烷偶联剂KH550对麦糟(Gr)进行改性，随后探究使用超临界CO2对不同比例的麦糟/PBAT/聚乳酸(PLA)复合材料进行发泡实验。最终通过密度测试、红外光谱、扫描电子显微镜、差示量热扫描测试、压缩回弹性能测试以及导热测试，研究了不同比例改性前后麦糟对复合泡沫发泡性能的影响。结果 经KH550改性得到的改性麦糟(KGr)与PBAT/PLA基体的相容性得到显著提升，麦糟可作为结构骨架支撑复合泡沫泡孔结构。PBAT/PLA复合泡沫放置14 d后发泡倍率减少54.4%，但麦糟/PBAT/PLA复合泡沫放置14 d后体积几乎不变。15%KGr- PBAT/PLA复合泡沫的接触角达到125.4°，明显高于PBAT/PLA复合泡沫的114.3°，15%KGr-PBAT/PLA复合泡沫抗压缩性能最佳。此外，15%KGr-PBAT/PLA复合泡沫隔热性能也优于PBAT/PLA复合泡沫。结论 麦糟可作为骨架结构支撑PBAT/PLA复合泡沫的泡孔;同时，使用KH550改性后的麦糟与PBAT/PLA基体的相容性变好，改性麦糟可显著提升麦糟/PBAT/PLA复合泡沫的发泡性能、疏水性能以及导热性能，从而应用于包装材料。

The work aims to improve the foaming performance of poly(butylene adipate-co-terephthalate) in supercritical carbon dioxide (CO2), and explore the application of foam in the field of hydrophobic and thermal insulation degradable packaging. Grains (Gr) were modified with silane coupling agent KH550, and then the effect of supercritical CO2 on the foaming properties of grains/PBAT/ polylactic acid (PLA) composites with different proportions was investigated. In addition, the effects of grains ratio before and after modification on the foaming performance were investigated through density testing, infrared spectroscopy, SEM, DSC, compressive resilience testing and thermal conductivity testing. The compatibility of the modified grains (KGr) with PBAT/PLA matrix was significantly improved after KH550 modification, and the grains could be used as structural framework to support the bubble structure of the foam. The foaming ratio of PBAT/PLA foam was reduced by 54.4% after 14 days of placement, but the volume of grains/PBAT/PLA foam was almost unchanged after 14 days of placement. The contact angle of 15%KGr-PBAT/PLA foam reached 125.4°, which was significantly higher than 114.3° of PBAT/PLA foam. The thermal insulation performance of 15%KGr-PBAT/PLA composite foam was also better than that of PBAT/PLA foam. The grains can be used as skeleton structure to support the pore of PBAT/PLA composite foam; at the same time, the grains modified by KH550 have better compatibility with PBAT/PLA matrix. The modified grains could significantly improve the foaming properties, hydrophobic properties and thermal conductivity of the grains/PBAT/PLA composite foam, so as to be applied to packaging materials.