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Synthesis and characterization of lactic acid – citric acid copolymers
Abstract
The processes of condensation of citric and lactic acids carried out in melt or by coupling in the presence of dicyclohexylcarbodiimide have been investigated. The obtained products were analyzed using 1H NMR, MALDI ToF and GPC techniques. It has been shown that the condensation in melt leads generally to acomplicated mixture of lactic acid copolymers and homopolymers. However, the combining of both methods allows to obtain in high yield the copolymers with branched structure, weight-average molar masses in the range 9–27 kg/mol and Mw/Mn values between 1.3 and 2.0. By using the coupling method, amphiphilic copolymers containing ahydrophobic core composed of citric and lactic acid monomeric units and hydrophilic polyoxyethylene segments were obtained as well. These products form stable colloidal aqueous dispersions with particle diameters ranging from 50 to 500 nm.
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