Abstract
Hyperbranched poly(ester)s with many pendant primary hydroxy groups were prepared in 21–84% yields by polyadditions of certain bis(oxetane)s such as 1,4-bis[(3-ethyl-3-oxetanylmethoxymethyl)]benzene (BEOB), 1,2-bis[(3-ethy-3-oxetanyl)methoxy]benzene (1,2-BEOMB), 1,3-bis[(3-ethy-3-oxetanyl)methoxy]benzene (1,3-BEOMB), 1,4-bis[(3-ethy-3-oxetanyl)methoxy]benzene (1,4-BEOMB), 4,4′-bis[(3-ethyl-3-oxetanyl)methoxy]biphenyl (4,4′-BEOBP), 3,3′,5,5′-tetramethyl-[4,4′-bis(3-ethyl-3-oxetanyl)methoxy]biphenyl (TM-BEOBP) with 1,3,5-benzenetricarboxylic acid (TMA) using tetraphenylphosphonium chloride (TPPC) as a catalyst in NMP at 140 °C for 12 h. Resulting polymers were insoluble in water; however, these polymers were soluble in 2.3% tetramethylammonium hydroxide aqueous solution. These polymers were also soluble in dioxane, THF, MEK, and aprotic polar solvents. The glass transition temperatures (Tgs) of these polymers were 59–131 °C.
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Nishikubo, T., Kudo, H. & Nakagami, T. Synthesis of Hyperbranched Poly(ester)s with Pendant Hydroxy Groups by the Polyaddition of Bis(oxetane)s with 1,3,5-Benzenetricarboxylic Acid. Polym J 38, 145–152 (2006). https://doi.org/10.1295/polymj.38.145
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DOI: https://doi.org/10.1295/polymj.38.145