Graduate Thesis Or Dissertation

 

Pressure sensitive adhesives based on oleic acid Pubblico Deposited

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/vh53wz292

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  • Existing pressure sensitive adhesives (PSAs) are mostly based on petrochemicals. In this study, a novel PSA based on a renewable material, methyl oleate, was prepared and characterized. Methyl oleate was first epoxidized to form epoxidized methyl oleate that was subsequently hydrolyzed and acidified to form epoxidized oleic acid (EOA) which is an AB-type monomer containing both a carboxylic acid group (A) and an epoxy group (B). Various methods for the preparation of EOA with high purity were extensively studied. EOA was homopolymerized in the presence of a catalyst to generate a polyester that could serve as a PSA. Various catalysts were investigated for their effectiveness on the homopolymerization, and chromium (III) tris(acetylacetonate) was found to be the most effective catalyst. Effects of the EOA purity on the PSA properties of the resulting polyesters were investigated in detail; the EOA purity of at least 97% was found to be required for the preparation of the PSA with superior properties. The crosslinking of the polyesters with very small amount of crosslinking agents was able to further improve the overall properties, especially the aging resistance of the resulting PSAs. Among various crosslinking agents investigated, polymeric methylene diphenyl diisocyanate was the most effective in improvement of the PSA properties. The PSAs were evaluated for their peel strength, tack force, shear resistance, and aging resistance. The PSAs were characterized for their viscoelastic properties, thermal properties, thermal stability, and chemical structures.  
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