Molar mass distribution of a commercial aliphatic hyperbranched polyester based on 2,2-bis(methylol)propionic acid

被引:39
作者
Zagar, E [1 ]
Zigon, M [1 ]
机构
[1] Natl Inst Chem, SI-1001 Ljubljana, Slovenia
关键词
molar mass distribution; light scattering; molar mass averages; hyperbranched polyester;
D O I
10.1016/j.chroma.2004.01.070
中图分类号
Q5 [生物化学];
学科分类号
071010 ; 081704 ;
摘要
The determination of absolute molar mass averages (MMA) and molar mass distribution (MMD) of the fourth generation hyperbranched polyester Bottom H40 (Perstorp Specialty Chemicals AB), synthesized from 2,2-bis(methylol)propionic acid (bis-MPA) as the AB(2) monomer and ethoxylated pentaerythritol as the B-4 core molecule was studied in dependence on the type of solvent, preparation procedure and solution concentration. Due to a large number of polar hydroxyl groups, ester, and also some residual carboxyl groups, a very stable H-bond network is formed at room temperature, that can-not be completely disrupted by dissolving the sample in solvents such as tetrahydrofuran (THF), N,N-dimethylacetamide (DMAc), a mixture of THF and methanol (9: 1, v/v), and a solution of 0.7% LiBr in DMAc. The H-bonds between the polar groups break down completely and the dissolution of Bottom H40 on the molecular level is achieved only when the sample is thermally pretreated at a minimum 140degreesC for at least 20 min prior to dissolution in solvents THF/methanol or LiBr/DMAc. Thus, determined MMA and molar mass distribution (MMD) of Boltorn H40 are independent on the kind of the solvent and solution concentration. (C) 2004 Elsevier B.V All rights reserved.
引用
收藏
页码:77 / 83
页数:7
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