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1 March 1991 Characterization of PMMA-EVA blend via photoacoustic technique
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The physical properties of the PMMA-EVA , a poly (methylmetacrylate) with 7% by wt. of poly (ethylene-covinylacetate) blend,have been investigated with a photoacoustic technique, which allows us to analyse the absorption as a function of the wave length. The informations obtained from the absorption spectra of this blend are useful in interpreting the behaviour of such a novel material subjected to thermal variations. In recent years, polymer and polymeric blends with high order susceptibility have attracted a great deal of attention in nonlinear optics field. We propose a novel polymeric blend for optical investigation, a poly (methylmetacrylate (PMMA) with 7% by wt. of poly (ethylene-co-vinylacetate) (EVA) blend, and present a simple characterization of this material by photoacoustic technique. This blend is polymerized by an unique technique in which the acrylic matrix is polymerized in the presence of dissolved EVA copolymer. The resulting blend is characterized by an intimate dispersion of rubbery droplets (diameter 1 jim) in an acrylic rubbery particles. The PMMA-EVA thermograph in the temperature range - 50 °C to 220 °C exhibits a phase transition at 50 °C, when 10% of EVA melts. Since this polymeric blend suffers an abrupt diffusion near the temperature of the phase transition (- 50 °C), we used the photoacoustic spectroscopy (PAS) in order to compare the absorption spectra at several temperatures. This technique, based on the photoacoustic effect, makes possible the analysis of samples with high absorption and/or scattering.
© (1991) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Giuseppe Carbonara, Pasquale Mormile, Umberto Bernini, Paolo Russo, Mario Malinconico, and M. G. Volpe "Characterization of PMMA-EVA blend via photoacoustic technique", Proc. SPIE 1361, Physical Concepts of Materials for Novel Optoelectronic Device Applications I: Materials Growth and Characterization, (1 March 1991);

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