2018
DOI: 10.1007/s12221-018-8539-7
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Spectroscopic Analyses on Chain Structure and Thermal Stabilization Behavior of Acrylonitrile/Methyl Acrylate/Itaconic Acid-based Copolymers Synthesized by Aqueous Suspension Polymerization

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Cited by 13 publications
(5 citation statements)
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“…A polimerização iniciou-se com um pH entre 2,7 e 3,0 e uma temperatura constante de 60 °C. Diversos trabalhos informam a utilização da temperatura de 60 °C para a polimerização de copolímeros de PAN [3,4,15].…”
Section: Figuraunclassified
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“…A polimerização iniciou-se com um pH entre 2,7 e 3,0 e uma temperatura constante de 60 °C. Diversos trabalhos informam a utilização da temperatura de 60 °C para a polimerização de copolímeros de PAN [3,4,15].…”
Section: Figuraunclassified
“…No entanto, como a PAN se mostrou insolúvel na maioria dos solventes comuns, a substância foi considerada inutilizável. Polímeros a base de PAN se caracterizam principalmente por não serem fusíveis, já que por aquecimento acima de 180 ºC ocorre a ciclização dos grupos nítrilicos (CN) com grande liberação de energia e gases [2][3][4][5]. Dessa forma, sucessivas experiências têm tentado buscar uma solução para o problema da degradação da PAN antes de atingir sua temperatura de fusão.…”
Section: Introductionunclassified
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“…In addition, the exact reaction mechanism varies depending on the gas atmosphere, heating rate, copolymer used, etc. [23,24]. Thus, having a better understanding of the structural evolution of PAN fibers during stabilization is a major issue in predicting the final structure of the polymer and, therefore, in functionalizing it.…”
Section: Introductionmentioning
confidence: 99%
“…Over the past few decades, many experimental investigations have been used to study the cyclization mechanism of PAN-based CFs during the TOS process by multifarious characterization methods, such as infrared spectroscopy (IR), , differential scanning calorimetry (DSC), , wide-angle X-ray diffraction (XRD or WAXD), nuclear magnetic resonance (NMR), and so on. Two kinds of cyclization mechanisms were proposed from the previous study: (1) free radical cyclization mechanism in PAN homopolymer, with the cyclization promoted by free radicals; (2) ionic cyclization mechanism in P­(AN- co -itaconic acid) copolymers, with cyclization promoted by a carboxyl group .…”
Section: Introductionmentioning
confidence: 99%