Association states of multisensitive smart polysaccharide-block-polyetheramine copolymers

作者：Belbekhouche Sabrina; De**rieres Jacques; Hamaide Thierry; Le Cerf Didier; Picton Luc^*

来源：Carbohydrate Polymers, 2013, 95(1): 41-49.

DOI：10.1016/j.carbpol.2013.02.032

• Associating polymers
• Thermosensitive
• pH-sensitive

The water soluble properties of different copolymers based on pullulan-block-polyetheramine have been deeply studied. The polyetheramine group (PEA) corresponding to a propylene oxyde/ethylene oxyde ratio (PO/EO) of 29/6, is condensed, via amine link, to pullulans with various chain lengths. Different polysaccharide/PEA (PS/PEA) ratio copolymers have been investigated through macroscopic (cloud point, enthalpy) and mesoscopic scale approaches (critical aggregation concentration (CAC), mean number average hydrodynamic diameter (Dh) or aggregation number (N-ag)). These systems are both pH and/or thermo-sensitive. Finally, it seems that three states can describe such systems (i) isolated copolymers (unimers) below the CAC, (ii) water soluble aggregates above the CAC and whatever the PS/PEA ratio is due to hydrophobic interactions and (iii) non-soluble aggregates (above the critical temperature) due to dehydration of polyetheramine groups but only if PS/PEA ratio is low enough.

• 出版日期2013-5-5