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Poly(ethylene-co-BMA) via dual concurrent ATRP–RAFT and its thermokinetic study

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Abstract

Well-defined copolymers of ethylene and butyl methacrylate (BMA) (poly(ethylene-co-BMA)) with narrow molecular weight distribution were synthesized via dual concurrent atom transfer radical polymerization (ATRP) and reversible addition–fragmentation chain transfer (RAFT) polymerization using 4-cyano-4-(phenylcarbonothioylthio)pentanoic acid as an alkyl pseudo-halide initiator, ascorbic acid/FeCl3/2,2′ bipyridine as the ATRP catalyst system and ethyl-2-bromo-isobutyrate as co-initiator in N, N′-dimethyl formamide at 100 °C. From size exclusion chromatography result, controlled molecular weight with narrow molecular weight distributions of poly(ethylene-co-BMA) was obtained in every case. The experimental results indicated that dual concurrent ATRP–RAFT polymerization is more successful over free radical or RAFT polymerization in terms of controlling molecular weight and polydispersity. X-ray diffraction analysis demonstrated the amorphous behaviour of poly(ethylene-co-BMA) while thermogravimetric analysis reveals that the main decomposition of poly(ethylene-co-BMA) occurs in the range 300–420 °C. The multivariate nonlinear regression analysis was performed to establish the mechanism and kinetic model and found that n-dimensional Avrami–Erofeev (An) mechanism was responsible for the decomposition of the synthesized poly(ethylene-co-BMA). The apparent activation energy (E a) of decomposition of the synthesized copolymer was found to be 211.88 kJ mol−1.

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Acknowledgements

The authors wish to thank Dr. D. Ramaiah, Director, CSIR-NEIST, Jorhat for permission to publish the results. The authors are very much thankful to the CSIR, New Delhi, for funding the Network Project CSC-0206. Authors express special thanks to Dr. Binoy K. Saikia and Mr. Tonkeswar Das for their assistance in thermal analysis.

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Authors and Affiliations

  1. CSIR-North East Institute of Science and Technology, Jorhat, Assam, 785 006, India

    Maitrayee Saikia, Somip Borphukan, Urmilla Baruah, Arvind Gautam, Prakash J. Saikia & Shashi D. Baruah

  2. Academy of Scientific and Innovative Research (AcSIR), Chennai, India

    Maitrayee Saikia, Urmilla Baruah, Arvind Gautam, Prakash J. Saikia & Shashi D. Baruah

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  1. Maitrayee Saikia
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  2. Somip Borphukan
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  3. Urmilla Baruah
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Correspondence to Arvind Gautam or Prakash J. Saikia.

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Saikia, M., Borphukan, S., Baruah, U. et al. Poly(ethylene-co-BMA) via dual concurrent ATRP–RAFT and its thermokinetic study. J Therm Anal Calorim 131, 1517–1526 (2018). https://doi.org/10.1007/s10973-017-6536-5

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  • DOI: https://doi.org/10.1007/s10973-017-6536-5

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