Block copolymers containing polyacrylamide and polyacrylic acid: Bulk structure and hydrogen bonds system |
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Authors: | L Kunitskaya T Zheltonozhskaya M Destarac S Mazieres |
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Institution: | 1. Taras Shevchenko National University of Kyiv, Kyiv, Ukraine;2. IMRCP, UMR CNRS 5623 Université de Toulouse, Toulouse, France |
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Abstract: | Asymmetric block copolymers PAAc-b-PAAm (DBCs) and PAAm-b-PAAc-b-PAAm (TBCs) comprised poly(acrylic acid) blocks of constant chain length and polyacrylamide blocks of variable chain length were synthesized using RAFT/MADIX technique. Their properties in a bulk state were studied by differential scanning calorimetry and the hydrogen bond system was investigated by Fourier transform infrared spectroscopy. It was found that DBCs and TBCs possess a homogeneous amorphous structure, whose temperatures of glass transition and destruction beginning increased with growth of PAAm block length. The H-bond system between PAAc and PAAm blocks was most developed in TBC sample and formed manly by the mixed cyclic dimmers of carboxyl and amide groups. |
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Keywords: | polyacrylamide poly(acrylic acid) block copolymer intramolecular polycomplex |
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