Effect of interfacial adhesion on the mechanical properties of poly(vinyl chloride) modified with cross-linked poly(methyl methacrylate) particles prepared by seeded emulsion polymerization |
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Authors: | Y Nakamura M Kanbe E Takekuni T Iida |
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Institution: | (1) Department of Applied Chemistry Osaka Institute of Technology 5-16-1 Ohmiya, Asahi-ku Osaka, 535-8585 Japan e-mail: nakamura@chem.oit.ac.jp Tel.: + 81-6-69544274 Fax: + 81-6-69572135, JP |
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Abstract: | The effect of interfacial adhesion on the mechanical properties of an incompatible polymer blend was investigated. For this
purpose, the preparation of non-cross-linked and cross-linked poly(methyl methacrylate) particles having mean sizes of about
0.8 μm was completed by seeded emulsion polymerization, and the number and the distribution of cross-linked points in the
particles were varied. The emulsion particles obtained were powdered by a freeze–dry method and dispersed into a poly(vinyl
chloride) matrix by melt blending. The non-cross-linked particles were completely dissolved in the matrix because poly(methyl
methacrylate) has good compatibility with poly(vinyl chloride). On the other hand, in the case of the cross-linked particles,
the mutual diffusion of the polymer molecules was restricted within the particle/matrix interfacial regions owing to the cross-linked
points. Additionally, interfacial structures with different concentration slope dependent upon the number and the distribution
of inner cross-linked points were developed with the same domain size. Mechanical and fracture properties were measured. As
a result, both yield stress and fracture toughness decreased with a decrease in the interfacial adhesion, and the decrease
was found to occur as a result of interfacial debonding. When the interfacial adhesion was sufficient it was never observed
that the level was lower than that of the components.
Received: 6 April 2000 Accepted: 29 September 2000 |
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Keywords: | Polymer blend Compatibility Interphase Concentration slope Emulsion polymerization |
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