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vol.11 número4Comportamento Viscoelástico Linear e Morfologia de Blendas PP/HDPECatalisadores Sulfônicos Imobilizados em Polímeros: Síntese, Caracterização e Avaliação índice de autoresíndice de assuntospesquisa de artigos
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Polímeros

versão impressa ISSN 0104-1428versão On-line ISSN 1678-5169

Resumo

ARAUJO, Sérgio C. de  e  KAWANO, Yoshio. Near-Infrared Spectra of Polystyrene, Poly(Methyl Methacrylate) and Polycarbonate . Polímeros [online]. 2001, vol.11, n.4, pp.213-221. ISSN 1678-5169.  https://doi.org/10.1590/S0104-14282001000400011.

The near-infrared (NIR) spectra of the amorphous polymers polystyrene (PS), poly(methyl methacrylate) (PMMA), and polycarbonate (PC) have been studied. The tentative assignment of the overtone and combination frequencies is made using the curve fitting calculations and the local mode theory. Anharmonicity correction and mechanical frequency were determined from a Birge-Sponer plot. A tentative assignment of stretch overtone frequency of CH2 and CH functional groups of PS; CH3 and CO functional groups of PMMA and CH, CH3 and CO functional groups of PC has been made. An anharmonicity correction of 57 and 58 cm-1 was obtained for CH2 and CH stretch modes of PS; 59 and 9 cm-1 for CH3 and CO stretch modes of PMMA and 53, 59 and 10 cm-1 for CH, CH3 and CO stretch modes of PC, respectively.

Palavras-chave : Near-infrared; polystyrene; poly(methyl methacrylate); polycarbonate.

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