The compressive resilience and shrinkage resistance properties of poly (butylene adipate-co-terephthalate) microcellular composite foams reinforced by functionalized microcrystalline cellulose

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In this study, microcrystalline cellulose (MCC) modified with triethoxyvinylsilane (T-MCC) on compressive resilience and shrinkage resistance properties of microcellular composite foams based on poly (butylene adipate- co -terephthalate) (PBAT) were reported. It was found that the modification of MCC (T-MCC) with triethoxyvinylsilane could enhance the dispersion of MCC in the PBAT matrix and their compatibility. The modified microcrystalline cellulose can be embedded in the foam system as a “skeleton”, interconnecting with adjacent cells to form the unique bridge-shell structure, contributing to a complete structure and enhancing the mechanical properties of foamed plastics . The complementary techniques of filling and crosslinking to produce foam with good compression elasticity and shrinkage resistance, which can increase its application, reduce the cost. Ultimately, PBAT/30T-MCC foam with 16.00 um cell size was successfully obtained, with the cell density as high as 2.18 × 10 9 cells/cm 3 and shrinkage rate of less than 3.6 %, and the compressive strength and resilience of the foam were as high as 55.1 KPa and 90.1 %, respectively, after ten loaded-unloaded compression tests. This study provides a theoretical basis for the design and development of PBAT composite foams with low cost, high shrinkage resistance, and high compressive resilience.