Abstract
Plant oils are attractive renewable feedstocks for biobased pressure-sensitive adhesives (PSAs). In this study, we investigated how the PSA adhesion properties were influenced by the compositions comprised of epoxidized soybean oil (ESO), 3,4-epoxycyclohexylmethyl 3,4-epoxycyclohexanecarboxylate (ECHM), dihydroxyl soybean oil (DSO), rosin ester, and cationic photo initiator. When the amounts of ESO and photo-initiator were constant, the variables of ECHM, DSO, and rosin amounts and their interactions were significant in influencing PSA peel adhesion strength, with p values smaller than 0.05 under a 95% significance level. Rosin amounts with the largest coefficient of 0.94 compared to the other variables are the most determinant factors. The peel adhesion strength was higher when using relatively a lower level of ECHM and a higher level of ESO and rosin. A model with the coefficient of determination (R 2) of 95.06% was obtained to describe the relationship between the amount of resin constituents (ECHM, DSO, and rosin) and PSA peel adhesion strength in the experimental variable ranges. The optimal PSA formulation without cohesive failure was (ECHM = 0.04, DSO = 0.7, rosin = 0.7), resulting in a peel adhesion strength of 4.45 N/in. Structure–property relationships of the PSAs were established via thermal and rheological studies.
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Acknowledgements
This is Contribution No. 16-185-J from the Kansas Agricultural Experimental Station. Financial support was provided by the USDA-NIFA Biomass Research and Development Initiative program (Grant No. 2012-10006-20230).
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Li, Y., Chou, SH., Qian, W. et al. Optimization of Soybean Oil Based Pressure-Sensitive Adhesives Using a Full Factorial Design. J Am Oil Chem Soc 94, 713–721 (2017). https://doi.org/10.1007/s11746-017-2966-2
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DOI: https://doi.org/10.1007/s11746-017-2966-2