Abstract
Thermoplastic polyurethane elastomers incorporating the resin acid-derived 12-hydroxymethylabietanol (12-HMA) were prepared, and some physical properties are reported. A polyester macroglycol was prepared from 12-HMA, adipic acid, and ethylene glycol. This macroglycol then was combined with either poly(tetramethylene adipate) glycol (PTAd) or poly(ethylene adipate) glycol (PEAd) and 1,4-butanediol to give a glycol blend of 300 average hydroxyl equivalent weight (OHE). The glycol mixture then was combined with diphenylmethane 4,4′-diisocyanate (MDI) (NCO/OH = 1.0) to give urethane polymers soluble in tetrahydrofuran. Polymers were prepared with 0, 5, 10, 15, 20, and 25%, by weight, 12-HMA with PTAd as the other macroglycol and with 0, 10, 15, and 20% 12-HMA with PEAd as the other macroglycol. At 15% 12-HMA, polymers were made from glycol mixtures having 275 and 350 average OHE to demonstrate the effect of changing the hard-segment concentration. The presence of 12-HMA is shown to have its maximum effect on tensile properties at 15–20% in the PTAd series and at 10% in the PEAd series. In general, this effect is an increase in tensile strength and modulus and a decrease in elongation when compared with a similar polymer without the 12-HMA.
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