The preparation of the PSAs does not use any organic solvent or toxic chemicals, thus being environmentally friendly. This new class of PSAs can be fully based on renewable materials. Incorporation of a small amount of phenylene-containing monomer BPAGE into the PSAs significantly increases the peel and shear strengths of the resulting PSAs. The adhesive properties of the PSAs can be tailored for specific applications such as PSA tapes and labels through the selection of the dicarboxylic acid and its usage. The PSAs had a peel strength of 1.4–5.0 N/cm, a loop tack of 7.1–12.6 N, a shear strength of 34 min to more than 168 h, and a good aging resistance. AMC-2, a chromium(III)-based organometallic compound, was found to be the most effective catalyst for the polymerization/cross-linking. The dicarboxylic acids used in this study included dimer acid (DA), sebacic acid, adipic acid, and a difunctional polymeric carboxylic acid that was prepared from polymerization of bisphenol A diglycidyl ether (BPAGE) and an excess of DA. Epoxidized soybean oil was polymerized and cross-linked with a dicarboxylic acid to generate superior PSAs. ![]() This study describes a novel approach for development of biobased PSAs. ![]() Existing pressure sensitive adhesives (PSAs) are mainly derived from petrochemicals.
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