Adjusting hydrogen bond by Lever Principle to achieve high performance starch-based biodegradable films with low migration quantity

摘要

To adopt carbohydrate polymers as biodegradable plastic is a promising strategy to eliminate the pollution evoked by oil-based plastics. Thermoplastic starch (TPS) with different glycerol and tartaric acid (TA) contents were prepared by twin-screw extrusion, then extruded with poly (butyleneadipate-co-terephthalate) (PBAT) to obtain PBAT/TPS. A "Lever Principle " was adopted for adjusting the hydrogen bond strength of TPS by varying TA and glycerol contents which influenced the blocking force, mechanical properties and migration quantity of PBAT/TPS (PT) films manufactured by film blowing. Noteworthy, as the glycerol content decreased from 27.5 to 15 %, with 25 times "Lever Principle " for increasing TA content, the migration weight and blocking force decreased from 5.8 % and 58.4 x 10(-4) N/mm for HPT0.5-27.5 to 1.7 % and 29.1 x 10(-4) N/mm for HPT0.5-15 with 15.2 MPa tensile strength. This study adopted "Lever Principle " to adjust hydrogen bond strength, which could realize the good performance with low migration quantity for biodegradable PT films.

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