Comparison of the associating behaviour between neutral and anionic alkylperfluorinated pullulan derivatives

被引：28

作者：

Glinel, K ^{[1
]}

Huguet, J ^{[1
]}

Muller, G ^{[1
]}

机构：

[1] Univ Rouen, Fac Sci, UMR 6522, F-76821 Mt St Aignan, France

来源：

POLYMER | 1999年 / 40卷 / 25期

关键词：

associative perfluorinated pullulans; hydrophobic modification; rheology;

D O I：

10.1016/S0032-3861(99)00085-3

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

New hydrophobically modified pullulans were synthesized in two ways: (i) neutral derivatives (HMPFs) obtained by direct esterification of pullulan with a perfluoroalkyl carboxylic acid (C8F17CH2CH2COOH), and (ii) ionic derivatives (HMCMPs) obtained by amidation of carboxymethylpullulan with two perfluoroalkylamines (C7F15CH2NH2 and C8F17CH2CH2NH2). The molar hydrophobe contents ranged from 1.1 to 4.8% with respect to the anhydroglucose units. Associative properties in aqueous solutions were studied by rheological and size-exclusion chromatography/light-scattering measurements. In dilute solution, the polymers form intermolecular aggregates with a more compact conformation than that of precursors. In semi-dilute solution, the ionic derivatives are more viscosifying than neutral because of. their better solubility. This effect is significant as the alkylperfluorinated chain length increases. (C) 1999 Elsevier Science Ltd. All rights reserved.

引用

页码：7071 / 7081

页数：11

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