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Proceedings Paper

New high-performance material in nonlinear optics field, the polymer blend PMMA-EVA: a first investigation
Author(s): Giuseppe Carbonara; Pasquale Mormile; Giancarlo Abbate; Umberto Bernini; Pasqualino Maddalena; Mario Malinconico
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Paper Abstract

A novel polymeric material a poly (methylmetacrylate) (PMMA) with 7 by wt. of poly (ethylenecovinylacetate) (EVA) blend is presented. The PMMAIEVA thermograph in the temperature range -50 to 220 C exhibits a phase transition at 50 C. During this transition the typical hysteresis of the polymeric transitions has been noted. We show the behaviour of the optical transmission as a function of the temperature and present some physical properties of this material. In the frame of a research on the preparation and characterization of high mechanical performances PMMA-based blends we conducted several optical tests in order to verify the potential applications of such blends in devices of integrated optics. Tough transparent PMMA is industrially produced by a multistage process of incorporation of rubbery particles in a methacrylic matrix. The rubbers are obtained by a suspension process in which a shell of cross-linked rubbery buthyl acrylate-styrene copolymer is polymerized around a PMMA matrix. The core-shell structure (fig. 1) is necessary in order to assume a good stress transfer between the phases and at the same time a better matching of the refractive indices of the two phases. To achieve the desired level of toughening high amounts (20-30 by wt) of rubber are necessary with an unavoidable diminution of elastic modules. In our procedure an amorphous ethylene-co-vinylacetate copolymer (EVA 20 by wt of VA) is used as rubbery component 1 The synthetic process

Paper Details

Date Published: 1 March 1991
PDF: 4 pages
Proc. SPIE 1361, Physical Concepts of Materials for Novel Optoelectronic Device Applications I: Materials Growth and Characterization, (1 March 1991); doi: 10.1117/12.24422
Show Author Affiliations
Giuseppe Carbonara, Istituto di Cibernetica/CNR (Italy)
Pasquale Mormile, Istituto di Cibernetica/CNR (Italy)
Giancarlo Abbate, Dip. di Scienze Fisiche (Italy)
Umberto Bernini, Dip. di Scienze Fisiche (Italy)
Pasqualino Maddalena, Dip. di Scienze Fisiche (Italy)
Mario Malinconico, Istituto di Ricerche su Tecnologie dei Polimeri e Reologia/C (Italy)

Published in SPIE Proceedings Vol. 1361:
Physical Concepts of Materials for Novel Optoelectronic Device Applications I: Materials Growth and Characterization
Manijeh Razeghi, Editor(s)

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