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      A modulated differential scanning calorimetry and small-angle x-ray scattering study of the interfacial region in structured latices

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          Abstract

          The interfacial structure of poly(styrene) (PS)-poly(methyl acrylate) (PMA) structured latices has been investigated by means of modulated-temperature differential scanning calorimetry (M-TDSC) and small-angle x-ray scattering (SAXS). The differential of heat capacity, dCp/dT, signal from M-TDSC was used to quantify the weight fraction of interface in these latices. For PS-PMA (50:50 by weight) structured latices in which the PS component had different crosslink densities (0, 1, 3, 5 and 10 mol% of crosslinking agent), the weight fraction of interface was about 13%. With increasing crosslink density, the fraction of interface increased only slightly. A core-shell model has been used to analyse SAXS data for these PS-PMA latices. M-TDSC can only provide information about the weight fraction of interface, but the combination of M-TDSC and SAXS can provide much more information on the morphology of such structured latices.

          Translated abstract

          A interface de latexes de poliestireno (PS)-poliacrilato de metila (PMA) foi investigada por calorimetria diferencial de varredura no modo modulado (DSC-modulado) e por espalhamento de raios-x de baixo ângulo (SAXS). A fração em massa da interface destes latexes foi estimada através do sinal do DSC-modulado, dCp/dt. Foi encontrado o valor de 13% para latexes de PS-PMA (1:1 em massa) contendo PS reticulado com diferentes densidades de reticulação (0, 1, 3, 5 e 10 mol% de agente reticulante). O aumento da densidade de reticulação não alterou de forma significativa a fração da interface. O modelo core-shell foi usado na análise dos dados de SAXS. Os dados de DSC-modulado forneceram informações apenas sobre a fração em massa da interface, entretanto a combinação das técnicas DSC-modulado e SAXS forneceu informações adicionais sobre a morfologia dos latexes.

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          Acta Polym.

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            Thermochim. Acta

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              J. Appl.Polym.Sci.

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                Author and article information

                Journal
                jbchs
                Journal of the Brazilian Chemical Society
                J. Braz. Chem. Soc.
                Sociedade Brasileira de Química (São Paulo, SP, Brazil )
                0103-5053
                1678-4790
                2001
                : 12
                : 1
                : 87-92
                Affiliations
                [01] orgnameLoughborough University orgdiv1Institute of Polymer Technology and Materials Engineering United Kingdom
                Article
                S0103-50532001000100012 S0103-5053(01)01200112
                10.1590/S0103-50532001000100012
                339ddb92-4ebb-408b-93c4-65432b011b88

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                History
                : 29 May 2000
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 17, Pages: 6
                Product

                SciELO Brazil

                Self URI: Full text available only in PDF format (EN)
                Categories
                Articles

                Latex,modulated DSC,interface,small-angle x-ray scattering

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