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《Chemical Research In Chinese Universities》 2000-12
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Studies on Modification of End Groups of Aliphatic Hyperbranched Polyester

TANG Li Ming , ZHANG Xiao Long, LI Wei, LIU De Shan [WT5”BX](Department of Chemical Engineering, School of Material Science and Engineering, Tsinghua University, Beijing 100084, China) [WT5HZ]  
A new process was designed to modify the hydroxy capped aliphatic hyperbranched polyester, derived from 2,2 bis(methylol) propionic acid and trimethylopropane in which the crude polyester reacted directly with maleic anhydride in bulk to transfer the hydroxy end groups to 4 carboxy 2 butante end groups. The modified polyester was characterized by IR, 1H NMR, DSC and viscosity measurement. The results indicated that no side reaction took place during the modifying step and the conversion for the reaction was calculated to be 88.9% based on the \+1H NMR spectra. The T g value shifted from 320 3 K for the crude polymer to 288 4 K for the modified polymer. Moreover, the UV curing coating of the midified polyester showed high performances in hardness, adhensive and water resistance. [WT5HZ]
【CateGory Index】: O631
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