Poly(-caprolactone) diols (HOPCLOH) and their poly(ester-urethane)s (PEUs): The effect of linear aliphatic diols HO-(CH2)m-OH as initiators

摘要

α,ω-Hydroxy telechelic poly(ε-caprolactones) were prepared by ring-opening polymerization ofudthe ε-caprolactone catalyzed by ammonium decamolybdate in the presence of different aliphaticuddiols [HO–(CH2)m–OH, where m ¼ 2, 4, 6, 8, 10, 12, 14, and 16] as initiators to obtain a family of α,ω-udhydroxy telechelic poly(ε-caprolactone) [HO–PCL–O–(CH2)m–O–PCL–OH, m ¼ 2, 4, 6, 8, 10, 12, 14,udand 16]. The content of the alkyl group (AG) (–(CH2)m–) had an important effect on the crystallinityud(xi) of α,ω-hydroxy telechelic poly(ε-caprolactone), showing a proportional relationship. In polyud(ester-urethanes) derived from α,ω-hydroxy telechelic poly(ε-caprolactones) and 1,6-udhexamethylene diisocyanate, the AG also showed a similar effect on the xi and eventually onudthe mechanical properties, increasing the values of the modulus. Therefore, AG content was audfactor to induce a plastic behavior in poly(ester-urethanes). The effect of AG on the water uptake ofudpoly(ester-urethanes) after 1 week was negligible.