Carboxy-terminated 4-arm star-shaped s-caprolactone oligomers (Tetra-SA-CLO, Tetra-PA-CLO, and Tetra-TCPA-CLO) were synthesized by the reactions of hydroxy-terminated 4-arm star-shaped s-caprolactone oligomers (Tetra-OH-CLO) having the degree of polymerization per one oligocaprolactone chain, n = 3 and 5 with succinic anhydride, phthalic anhydride, and 2,3,4,5-tetrachlorophthalic anhydride, respectively. As a pyridyl-terminated analog, nicotinate-functionalized 4-arm star-shaped s-caprolactone oligomer (Tetra-NA-CLO) was synthesized by the esterification reaction of Tetra-OH-CLO with nicotinic acid. All mixtures of the carboxy- and pyridyl-terminated analogs became thermoreversible organogels in N,N-dimethylformamide and nitromethane at around 15 degrees C. The H-1 NMR and FT-IR analyses of the mixtures revealed the formation of hydrogen-bonded polymer network. The glass transition and cold crystallization temperatures of the mixtures were higher than the values estimated from those of the single components. (C) 2013 Elsevier Inc. All rights reserved.