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Isosorbide-based solvent pressure-sensitive adhesives crosslinked with epoxidized soybean oil: optimizing performance via adhesion-cohesion balance
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DOI：10.1016/j.ijadhadh.2026.104347.png)
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Abstract
En 中文
Despite the significant advantages of waterborne and solvent-free alternatives, solvent-based pressure-sensitive adhesives (PSAs) are still irreplaceable for high-performance applications. This irreplaceability has driven considerable interest in developing sustainable solvent-based PSAs from biomass. To address this need, we introduced a novel solvent-based PSA system incorporating bio-based isosorbide acrylate (IA) and epoxidized soybean oil (ESO). The system was fabricated by synthesizing isosorbide-based acrylic prepolymers and crosslinking them with ESO via thermally activated epoxy-carboxyl reactions. The chemical structures and molecular weights of the prepolymers were characterized using attenuated total reflection Fourier transform infrared spectroscopy, nuclear magnetic resonance spectroscopy, and gel permeation chromatography. A comprehensive performance evaluation of PSAs, covering gel content, adhesion (180° peel and initial tack), cohesion (holding power), thermal properties (glass transition temperature), and rheology, was conducted using solvent extraction, standard mechanical tests, differential scanning calorimetry, and rotational rheometry. Systematic optimization identified the IA:butyl acrylate (BA) molar ratio (0−10:100) as the key regulator of chain flexibility and the ESO curing time (0−3 h) as the primary determinant of network density. The optimal formulation (IA:BA = 10:100, 1-h curing) achieved a good adhesion-cohesion balance, exhibiting an initial tack (No. 7 steel ball), a 180° peel strength of 14.9 N/25 mm, and an exceptional holding power of 7453 min under a 1 kg load. Although ESO significantly enhanced creep resistance, overcuring (>1 h) led to excessive crosslinking, resulting in network embrittlement and an 80% reduction in peel force.
Keywords:
isosorbide acrylate
epoxidized soybean oil
pressure-sensitive adhesives
bio-based polymers
adhesion-cohesion balance
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