Abstract
AbstractDihydroxyl soybean oil (DSO) has shown potential as a tackifier for pressure‐sensitive adhesive (PSA) applications, and perchloric acid was used previously as a catalyst to open the oxirane rings of epoxidized soybean oils (ESO) when we prepared DSO and PSA. Phosphoric acid is a more eco‐friendly catalyst than perchloric acid; therefore, the objective of this work was to prepare DSO using phosphoric acid as a catalyst and thereby create DSO‐contained phosphate esters, or PDSO. The chemical scaffolds of PDSO were elucidated with 1H, 1H–1H COSY, 31P NMR, FTIR, MALDI‐TOF MS, and GPC. ESO PSAs were prepared from a mixture of ESO/PDSO. The ESO PSA prepared with PDSO had peel strength on a plastic carrier comparable to commercial PSA, and while on an aluminum carrier, the ESO PSA had a stronger peel strength. ESO PSA prepared with phosphoric acid was also stronger than the peel strength of the ESO PSA prepared with DSO using perchloric acid.
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