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Study on the Structure and Properties of Epoxy/clay Nanocomposites

Author: DengYuMing
Tutor: GuZuoJuan；FangZhengPing
School: Zhejiang University
Course: Materials Science
Keywords: Epoxy resin Rubber Clay Nanocomposite Optical performance Mechanical Properties
CLC: TB332
Type: Master's thesis
Year: 2003
Downloads: 241
Quote: 0
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Abstract

This work is divided into two parts, the first part is optically transparent epoxy / clay nanocomposites (EC) optical performance and explore the structure of the relationship; second part epoxy / rubber / clay ternary complex materials (ERC) preparation, structure and mechanical properties of relations research. 1. The optical transparent epoxy / clay nanocomposites optical properties 18 alkyl primary amine salts, cetyl trimethyl ammonium bromide treatment Na montmorillonite prepared two different organic soil with triethylamine as a curing agent, organic soil with bisphenol A type epoxy resin melt intercalation polymerization prepared two structure of exfoliated and intercalated epoxy / clay nanocomposites. XRD, SEM and TEM experimental means were used to characterize the structure of materials; and epoxy / clay nanocomposites two yuan optical performance of the system. The results show that the rate of the light transmittance of the material decreases with increasing clay content increases with increasing wavelength, and gradually flatten. The structure of the clay in an epoxy resin matrix has a great influence on the optical transparency of the material, when the content of the organic soil, clay peeling EC material beneficial to maintain a high transmittance; intercalation when a low clay content peel-type nano-composite material of the nano-composite material with a high clay content is compared, the magnitude relation of the light transmittance of the material changes with wavelength changes: intercalation-type nano-composite material is superior to the latter in a short wavelength; wavelength becomes longer when the peel-type nano-composite material has a high light transmittance, the clay content in the system is much greater than intercalated nano composites. Also studied the influence of the amount of the curing agent on the light transmittance of the material, to reduce the amount of curing agent conducive to the peeling of the clay in an epoxy resin matrix, the system has a high light transmittance. Peel-type nano-light transmittance of the composite material with the content of organic soil and the wavelength relationship on further studies material normalized transmittance and organic soil content and wavelength, the following empirical relation exists: and using the spherical particles The light scattering model of these experimental results and theoretical analysis. Conducted a study on the thermal expansion coefficient of the composite material of the peel-type nano system coefficient of thermal expansion as the clay content increases significantly decreased, and still maintain good optical transparency. Clay nanocomposite is the preparation of a good high transmittance and low coefficient of expansion optoelectronic device packaging epoxy composites. 2. Epoxy resin / rubber / clay ternary composites prepared by melt blending the epoxy resin / rubber / clay ternary complex materials, the preparation process of the the CTBN, C18 content of the order of addition and curing process of C18 in the ternary complex material structure and mechanical properties of the material. The results show that the method can only be prepared using melt intercalation phase ternary complex Zhejiang University Thesis material the clay completely dispersed in Ep clay added rubber and epoxy phase separation process has little effect. The impact toughness of the ternary system is decreased with the increase of the clay amount, the modulus increases. Added CTBN liquid rubber, CTBN with epoxy with organic soil synchronization blend, using a two-step curing process and more conducive to the use of a small amount of organic the dispersed organic soil and peel. Try the solution blending method and ternary composites, the introduction of reactive functional group preparation ERC to study the relationship between the structure and mechanical properties of the system in the clay layer. The results show that, to introduce the reactive functional group is conducive to the combination of clay and a rubber, the phase of the rubber / EP separated promoting effect, but due to the increase in the modulus of the rubber phase, the toughening effect is decreased.

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