Synthesis of C22-Branched Triglycerides and Its Application
Using branched C22-ternary acid as the raw material,three different esters including C22-ternary acid trimethyl ester(BTA-OA-ME),C22-ternary acid triisooctyl ester,and C22-ternary acid tri(diethylene glycol)butyl ether ester were prepared by direct esterification with different structured alcohols(methanol,isooctanol,diethylene glycol monobutyl ether).These three esters were then applied as plasticizers to produce flexible films of polyvinyl chloride(PVC),and their performance was compared with that of commercial DnOP and DEHP.The products were characterized by infrared spectroscopy and 1HNMR.Differences in the mechanical properties of PVC films plasticized with the three types of plasticizers and DnOP and DEHP were compared through thermogravimetric analysis(TGA),tensile testing,differential scanning calorimetry(DSC)testing,migration resistance testing,and volatile resistance testing.The results showed that compared with PVC films plasticized with DnOP and DEHP,all three plasticizers effectively improved the thermal stability and mechanical properties of the PVC films.Among them,the BTA-OA-ME/PVC films exhibited the best performance,with a glass transition temperature equivalent to that of DnOP and DEHP.The initial degradation temperature(t5%)increased by 10℃and 9℃,respectively,compared to DnOP and DEHP;the elongation at break increased by 59.56%and 68.45%,respectively;and the mass loss rate after 24 hours of volatile resistance testing was reduced by 6.9%and 4.2%,respectively,indicating its potential for replacing DEHP or DnOP.
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