0331_2003_Park_et_al - MARCEL DEKKER, INC. 270 MADISON...

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Characterization in the Toughening Process of CTBN Modified Epoxy Resins Induced by Electron Beam Radiation Jong Seok Park, 1 Phil Hyun Kang, 2 Young Chang Nho, 2, * and Dong Hack Suh 1 1 Department of Chemical Engineering, Hanyang University, Haengdang-1-Dong, Seongdong-Ku, Seoul, South Korea 2 Radiation Application Research Division, Korea Atomic Energy Research Institute, Daejon, South Korea ABSTRACT Epoxy resins are widely utilized as high performance thermosetting resins for many industrial applications but characterized by a relatively low toughness. Electron beam (EB) curing of polymer resins has a number of advantages over conventional thermal curing, such as shorter curing time, low energy consumption, low cure temperature, dimensional stability, reduced manufacturing cost. In the present work liquid carboxyl- terminated butadiene acrylonitrile (CTBN) copolymers containing 8% acrylonitrile is added at different contents to improve the toughness of diglycidyl ether of bisphenol A (DGEBA) epoxy resins using triarylsulfonium hexafluoroanimonate as a photointiator. The EB irradiation was conducted 5 kGy to 250 kGy in nitrogen. The physics properties of CTBN modified epoxy resins were examined by determine gel content, DMA (dynamic mechanical analysis), UTM (Instron model 4443), SEM (scanning electron microscopy). Key Words: Epoxy resin; CTBN; Electron beam curing; Flexural properties. 641 DOI: 10.1081/MA-120020862 1060-1325 (Print); 1520-5738 (Online) Copyright q 2003 by Marcel Dekker, Inc. www.dekker.com * Correspondence: Professor Young Chang Nho, Radiation Application Research Division, Korea Atomic Energy Research Institute, Daejon 305-600, South Korea. JOURNAL OF MACROMOLECULAR SCIENCE w Part A—Pure and Applied Chemistry Vol. A40, No. 6, pp. 641–653, 2003 MARCEL DEKKER, INC. • 270 MADISON AVENUE • NEW YORK, NY 10016 ©2003 Marcel Dekker, Inc. All rights reserved. This material may not be used or reproduced in any form without the express written permission of Marcel Dekker, Inc.
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INTRODUCTION The application of the cured epoxy resins have been expanded in various field such as coatings, adhesives, and other engineering applications. However, a major drawback of epoxy resins is their inherent brittleness due to theirs highly cross-linked structure, which has led to extensive research efforts to improve their low toughness. [1] It is desirable to enhance toughness without adversely affecting the other useful properties of the polymer. Therefore, epoxy resins are usually toughened by modifying with a liquid rubber. [2–8] When epoxy resins together with liquid rubber is cured, the domains of rubber are separated from the epoxy matrix due to the incompatibility between epoxy resin and liquid rubber and liquid rubber modified epoxy resins were improved the toughness by absorbing the impact energy.
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0331_2003_Park_et_al - MARCEL DEKKER, INC. 270 MADISON...

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