Studies on Modification of End Groups of Aliphatic Hyperbranched Polyester

Abstract

Abstract: Anew process was designed to modify the hydroxy capped aliphatic hyperbranched polyester, derived from2,2 bis(methylol) propionic acid and trimethylopropane in which the crude polyester reacted directly with maleic anhydride in bulk to transfer the hydroxy end groups to4-carboxy-2- butante end groups.The modified polyester was characterized by IR, ¹H NMR, DSCand viscosity measurement.The results indicated that no side reaction took place during the modifying step and the conversion for the reaction was calculated to be88.9% based on the ¹H NMRspectra.The T_gvalue shifted from320.3 Kfor the crude polymer to288.4 Kfor the modified polymer.Moreover, the UVcuring coating of the midified polyester showed high performances in hardness, adhensive and water resistance

Key words: Hyperbranched polymer, Aliphatic polyester, End groups, Modification

CLC Number:

O631

TrendMD:

TANG Li-Ming, ZHANG Xiao-Long, LI Wei, LIU De-Shan. Studies on Modification of End Groups of Aliphatic Hyperbranched Polyester[J]. Chem. J. Chinese Universities, 2000, 21(12): 1950.

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Studies on Modification of End Groups of Aliphatic Hyperbranched Polyester

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