Synthesis of polyurethane acrylates by hydrogenated castor oil and dimer-based polyester diol and study on pressure-sensitive adhesive

• Published in: Journal of applied polymer science Vol. 98; no. 4; pp. 1814 - 1821
• Main Authors: Ren, Yaobin, Pan, Huiming, Li, Longsi, Xia, Jianming, Yang, Yongqiang
• Format: Journal Article
• Language: English
• Published: Hoboken Wiley Subscription Services, Inc., A Wiley Company 15.11.2005; Wiley
• Subjects: adhesives; Applied sciences; Exact sciences and technology; Physicochemistry of polymers; Polymerization; Polymers and radiations; polyurethane; viscoelastic properties; Viscoelasticity; Adhesivity; Property composition relationship; adhesives; Mass copolymerization; Vegetable oil; Experimental study; Urethane copolymer; Polyaddition; viscoelastic properties; Crosslinked copolymer; Shear viscosity; Esterurethane polymer; Preparation; Plant origin; Surface properties; Acrylate copolymer; Prepolymer; polyurethane; Chemical reactivity; Pressure sensitive adhesive; Photochemical copolymerization; Rheological properties
• ISSN: 0021-8995; 1097-4628
• DOI: 10.1002/app.22330

Synthesis of polyurethane acrylate (PUA) and preparation of the UV‐cured pressure‐sensitive adhesives (PSA) are reported. Molecular weight (Mw) (by gel permeation chromatography) and viscosity (η*) of PUA were measured. Characterization of PUA and PSA before and after UV‐curing was made by FTIR. Increase of the hydroxyls from hydrogenated castor oil/hydroxyls from dimer‐based polyester diol (OHHCO/OHDiol) ratio decreased the Mw and η* value of PUA. Dynamic viscoelastic properties (by dynamic rheological spectrometer) and performance of the UV‐cured PSA were also studied. Increase of the OHHCO/OHDiol ratio increased the storage modulus (G′), the loss modulus (G″), and complex viscosity (Eta*) of the UV‐cured PSA, which, in turn, enhanced holding power and shear adhesion failure temperature (SAFT) and yet decreased peeling strength. Substitution of OB for DBTDL depressed the Mw and η* value of PUA, while the G″ and Eta* values of the UV‐cured PSA were elevated, which, in turn, increased the holding power and SAFT and yet depressed the peeling strength. Elevation of the tackifying resin content depressed the G′, G″, and Eta* values of the cured PSA and yet increased glass transition temperatures (Tg) of PSA, measured by differential scanning calorimetry. Peeling strength of PSA elevated as increasing the tackifying resin, while the holding power and SAFT fell. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 98: 1814–1821, 2005