Blends of polyamide 6 with bisphenol-A polycarbonate. I. Thermal properties and compatibility aspects

Authors

  • Ercole Gattiglia,

    1. Centro Studi Chimico-Fisici di Macromolecole Sintetiche e Naturali, CNR-Istituto di Chimica Industriale, Università Corso Europa, 30-16132 Genova, Italy
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  • Antonio Turturro,

    1. Centro Studi Chimico-Fisici di Macromolecole Sintetiche e Naturali, CNR-Istituto di Chimica Industriale, Università Corso Europa, 30-16132 Genova, Italy
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  • Enrico Pedemonte

    1. Centro Studi Chimico-Fisici di Macromolecole Sintetiche e Naturali, CNR-Istituto di Chimica Industriale, Università Corso Europa, 30-16132 Genova, Italy
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Abstract

Blends of polyamide 6 (PA6) and polycarbonate (PC) have been investigated, over a full range of composition, to check interactions between them. SEM observations show that the mixtures are characterized by domains of clearly segregated homophases and voids between the two polymers. DSC and DMTA data indicate the presence of two Tg' s, corresponding to two separate phases, with the Tg of the PC phase decreasing on increasing the PA6 amount. Moreover, the crystallization kinetics of PA6 is slightly showed down by the PC. Chemical reactions between the two polymers are supposed to give rise to low molar mass compounds, as shown by GPC; these species plasticize the PC and partially dissolve into the molten polyamide, causing decrease of PC Tg and reduction of overall crystallization rate of PA6. Apparent influence of PC on melting temperature and enthalpy of PA6 is also discussed.

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