Synthesis and plasticizing performance study of environmentally friendly oleic acid-based polyester plasticizer
The plasticizer dioctyl phthalate(DOP)has issues of reproductive toxicity and poor migration resistance.Methyl oleate was selected as the primary raw material to synthesize hyperbranched polyethylene(HBPE)through processes including double bond epoxidation,epoxy group hydrolysis and bulk transesterification.This was followed by butyrylation to synthesize IA-HBPE polyester,which can serve as a green,low-toxicity bio-based plasticizer.The chemical structures of different plasticizer samples were characterized using FTIR and 1H-NMR.Subsequently,polyvinyl chloride(PVC)composites were prepared using the solution casting method,and the glass transition temperature,mechanical properties,thermal stability and migration resistance of different PVC composites were tested.The results show that IA-HBPE polyester has good compatibility with PVC,and the glass transition temperature of PVC material plasticized with IA-HBPE polyester decreases from 75.0℃to-5.0℃.The elongation at break of PVC material plasticized with IA-HBPE polyester reach 402.0%,compared to 289.5%for PVC material plasticized with DOP.Compared to DOP,the extraction rate and volatilization rate of IA-HBPE polyester in PVC materials are reduced by 22.99%and 7.08%,respectively,indicating superior migration resistance of IA-HBPE polyester.PVC materials plasticized with IA-HBPE can maintain good thermal stability below 220℃,meeting the requirements for practical thermal processing.The hyperbranched polyester based on oleic acid is an efficient,environmentally friendly new plasticizer,showing promise as a replacement for DOP.
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