Preparation and migration resistance of epoxidized fatty acid multi-ester bio-plasticizer
To suppress leaching of epoxidized fatty acid ester bio-plasticizers in polyvinyl chloride matrix,a Michael addition reaction was performed to covalently attach one short ester at the α-position of waste cooking oil-derived fatty acid di-ester in rela-tively high yields.The resulting intermediate without purification was subjected to epoxidation,yielding a novel epoxidized fatty acid multi-ester bio-plasticizer.The composition and molecular structure of the engineered bio-plasticizer were determined by gas chromatography-mass spectrometry and 1H nuclear magnetic resonance.Then,leaching resistance of epoxidized fatty acid multi-ester and epoxidized fatty acid di-esters in polyvinyl chloride matrix was evaluated.The results demonstrate that attaching of the third ester group provide the epoxidized fatty acid ester with better resistance to volatilization,leaching and extraction to a level superior to that of di-(2-ethylhexyl)phthalate.The present efforts may provide guidance for other researchers in the molecular design and synthesis of high-performance polyvinyl chloride bio-plasticizers and all-component high-value utilization of waste cooking oil.
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