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Cloud Point Temperature, Thermal and Dielectrical Behaviors of Thermosensitive Block Copolymers Based N-Isopropylacrylamide

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Abstract

The diblock and triblock copolymers were synthesized by chain extending on poly(N-isopropyl-acrylamide) (H-PNIPA) with HO–CH2CH2– and α-Cl end group obtained from atom transfer radical polymerizaiton technique by aid of the same technique, using ethylmethacrylate (EMA), 2-hydroxypropyl methacrylate (HPMA), N,N-dimethylacrylamide (DMA) and benzylmethacrylate (BMA) as comonomers. Number average molecular weight of H-PNIPA homopolymer and the diblock copolymers, H-PNIPA-b-PEMA, H-PNIPA-b-PHPMA, H-PNIPA-b-PDMA were estimated as 1960, 3990, 3110 and 4040 g/mol, from 1H NMR spectra. Structure of the copolymers were characterized by FTIR and 1H NMR techniques. TGA curves showed that the thermal stability of the diblock and triblock copolymers decrease comparing to H-PNIPA. The Tg temperatures of the polymers, H-PNIPA, the diblock copolymers, and triblock copolymers, H-PNIPA-b-PDMA-b-PEMA and H-PNIPA-b-PDMA-b-PBMA were predicted from the DSC curves, as 130°C, in range of 105–115, and 90 and 100°C, respectively. The dielectric constant decreased slightly in the frequency range between 0.1 and 2.0 kHz at room temperature. Cloud point temperature (CPT) values of H-PNIPA homopolymer and the block copolymers were determined using UV–Vis, turbidimetry and viscometer techniques in aqueous solution. The CPTs found by three different techniques for each polymer were close to each other. In the diblock and triblock copolymers, some differences in CPTs were observed according to comonomer and these were discussed.

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Authors and Affiliations

  1. University of Fırat, Faculty of Science, Department of Chemistry, 23119, Elazığ, Turkey

    Serzen İlboğa, Ersin Pekdemir & Mehmet Coşkun

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  1. Serzen İlboğa
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  2. Ersin Pekdemir
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  3. Mehmet Coşkun
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Correspondence to Mehmet Coşkun.

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Serzen İlboğa, Pekdemir, E. & Coşkun, M. Cloud Point Temperature, Thermal and Dielectrical Behaviors of Thermosensitive Block Copolymers Based N-Isopropylacrylamide. Polym. Sci. Ser. B 61, 32–41 (2019). https://doi.org/10.1134/S1560090419010068

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