Thermal aging and accelerated weathering of PVC/MMT nanocomposites: Structural and morphological studies / Joanna Pagacz, Michał Chrzanowski, Izabella Krucińska, Krzysztof Pielichowski // Journal of ... więcej

Thermal aging and accelerated weathering of PVC/MMT nanocomposites: Structural and morphological studies / Joanna Pagacz, Michał Chrzanowski, Izabella Krucińska, Krzysztof Pielichowski // Journal of Applied Polymer Science [Dokument elektroniczny]. – 2015, Vol. 132, Iss. 24, s. 1-12 : fot., rys., tab., wykr. – Tryb dostępu: http://onlinelibrary.wiley.com/doi/10.1002/app.42090/epdf. – Bibliogr. 63 poz., Abstr. – doi: 10.1002/app.42090. – ISSN 0021-8995

This work focuses on the influence of weathering factors—UV radiation, humidity, and temperature on the structure and morphology of poly(vinyl chloride)/montmorillonite (PVC/MMT) nanocomposites obtained ... więcej

This work focuses on the influence of weathering factors—UV radiation, humidity, and temperature on the structure and morphology of poly(vinyl chloride)/montmorillonite (PVC/MMT) nanocomposites obtained by melt blending. It has been observed that organically modified MMT (OMMT) deteriorates the weathering resistance, the thermal behavior, as well as the long-term stability of PVC. Decomposition of the organic modifier of MMT causes substantial color changes in the PVC nanocomposites as it facilitates the dehydrochlorination process of the polymer. However, the nonmodified MMT provides some stabilization during PVC weathering. The nanocomposites after annealing are characterized by higher glass transition temperature. The increase in heat capacity step (Δcp) during glass transition suggests that in the PVC composites with nonmodified MMT stronger molecular interactions between the polymer and clay platelets occur than in PVC/OMMT nanocomposites. The scanning electron microscopy images on the surface and the cross section show that thermal aging and weathering proceed by different mechanisms.