Journal
POLYMER INTERNATIONAL
Volume 62, Issue 9, Pages 1293-1301Publisher
WILEY-BLACKWELL
DOI: 10.1002/pi.4420
Keywords
pressure-sensitive adhesives; UV; functionalized soybean oils; rosin esters
Categories
Funding
- USB (United Soybean Board)
- KSC (Kansas Soybean Commission)
- Office of Integrative Activities
- Office Of The Director [903806] Funding Source: National Science Foundation
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Functionalized plant oils such as epoxidized soybean oil (ESO) are widely used in plastic industries as additives and are available for more value-added applications. Pressure-sensitive adhesive (PSA) derived from petroleum feedstocks has a huge market ranging from tapes to packaging. Here we show a sustainable PSA derived from ESO/dihydroxyl soybean oil (DSO)/rosin ester (Sylvalite) via UV-initiated copolymerization. The ether crosslinks derived from cationic polymerization of ESO and copolymerization between ESO and DSO (or rosin ester) were demonstrated using H-1 NMR, 2D H-1-H-1 COSY NMR, electrospray ionization mass spectrometry and thermal analyses (differential scanning calorimetry and thermogravimetric analysis). The PSA was formulated by modulating the ratio of ESO/DSO/rosin ester to achieve high performance. At a UV dose of 5.1-5.4 J cm(-2) and 0.3-3% (w/w) of a photoinitiator, i.e. [4-(2-hydroxy-1-tetradecyloxy)-phenyl]phenyliodonium hexafluoroantimonate, the PSA at a ratio (by weight) of 1:1:0.7 (ESO/DSO/rosin ester) recorded the highest peel and loop tack strength, which was comparable to a commercial PSA, Scotch Magic Tape, and showed much stronger shear strength (>30 000 min) than the commercial tape (10 000 min). The high-shear rheological behavior and excellent thermal stability of the PSA were also demonstrated. (C) 2012 Society of Chemical Industry
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