YANG Yiling1, WANG Wenbin1, TAO Wenquan1, LI Xuefeng1,2,*, ZHANG Gaowen1,2, LONG Shijun1,2, HUANG Yiwan1,2
1 School of Materials Science and Chemical Engineering, Hubei University of Technology, Wuhan 430068, China; 2 Hubei Provincial Key Laboratory of Green Materials for Light Industry, Hubei University of Technology, Wuhan 430068, China
Abstract: To address the incompatibility-induced performance deterioration in conventional thermoplastic starch/poly(butylene adipate-co-terephthalate)(TPS/PBAT) blends, a dynamic covalent chemistry strategy was developed to construct reprocessable starch-based plastics. Through melt-grafting of amino-functionalized side chains onto the TPS/PBAT matrix followed by the incorporation of an aldehyde crosslinker, a self-hea-ling dynamically cross-linked TPS/PBAT(DC-(TPS/PBAT)) network was successfully established via temperature sensitive Schiff base reactions. FTIR and XPS analyses confirmed the formation of a dynamically cross-linked network architecture, while SEM characterization revealed enhanced interfacial compatibility between TPS and PBAT phases through improved molecular interactions. The optimized DC-(TPS/PBAT) exhibited remarkable tensile strength(22.5 MPa) with 85.5% retention of initial mechanical properties after three reprocessing cycles, attributed to the reversible breakage/reformation of dynamic imine bonds enabling molecular chain rearrangement. Compost degradation tests demonstrated 80.04% mass loss within 528 h, confirming its biodegradability. This study provides a novel methodology for developing high-performance, reprocessable, and environmentally friendly starch-based thermoplastic materials through dynamic covalent cross-linking strategies.
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2026, Vol. 40 
