Development and Characterization of Pressure-Sensitive Adhesives from Dimer Acid and Epoxides

Abstract

A novel approach has been developed for the preparation of pressure-sensitive adhesive (PSA) films from renewable dimer acid (DA) and epoxides.DA was polymerized with various epoxides such as dimer acid diglycidyl ester (DADGE), neopentyl glycol diglycidyl ether, 1,4-butanediol diglycidyl ether, bisphenol A diglycidyl ether (BPAGE), trimethylolpropane triglycidyl ether (TMPGE), N,N-diglycidyl-4-glycidyloxyaniline, and tris(2,3-epoxypropyl) isocyanurate (TEPIC) under different conditions. The resulting polymers were evaluated for various PSA properties such as tack, peel strength, shear strength, and aging resistance. It was found that only the polymer from the DA-TMPGE mixture could serve as a PSA. Copolymerization of the aliphatic epoxides TMPGE and DADGE with DA did not generate a PSA with adequate cohesive strength. The replacement of the aliphatic epoxide DADGE with the phenylene-containing epoxide BPAGE resulted in PSAs with a peel strength of 1.5-2.6 N/cm, a loop tack of 2.7-6.9 N, a superior shear strength of more than 240 h, and a good aging resistance. Incorporation of a triazine ring into the polymers from DA-epoxide mixtures through the use of the triazine-containing epoxide TEPIC as a crosslinking agent also resulted in PSAs with a superior peel strength of 3.4-5.7 N/cm and a good loop tack of 12.8 N. The PSA properties of the polymers from the DA-epoxide mixtures could be tailored

Green Polymer Chemistry: Some Recent Developments and Examples

“…Li and Li (55) developed new pressure-sensitive adhesives (PSAs) from renewable dimer acid (DA) and epoxides. Upon evaluation, only the polymer from the DA and trimethylolpropane triglycidyl ether could serve as a PSA.…”

“…Phosphorus-containing isosorbide esters are possible flame retardants (51). Dimer-epoxy resins are noted as pressure sensitive adhesives (55). Aerogels, which can be made from biobased polymers, are shown to have excellent properties (58).…”

Epoxidized Soybean-Oils-Based Pressure-Sensitive Adhesives with Di-Hydroxylated Soybean-Oils Copolymerizing and Antioxidant Grafting

“…In addition, PSA preparation using epoxidized fatty acids and their methyl esters has also been reported [ 11 ]. Like vegetable oils, however, vegetable-oils-based PSAs face easy aging issues under the actions of oxygen, heating, moisture, and ultraviolet radiation in the surroundings [ 12 ], because PSA polymer contains the residual double bonds caused by the incomplete conversion of peroxidization as well as a large number of ester bonds.…”