Morphology and Mechanical Behavior of Interpenetrating Polymer Networks
The synthesis and morphology of IPN’s are compared to the several other methods of preparing blends of distinguishable polymer pairs. Both components of IPN’s are continuous throughout, the very finely divided phase domain dimensions being controlled by the crosslink density.
When the elastic phase predominates, the IPN’s behave as reinforced elastomers. As the glassy component is increased, the material becomes an impact resistant plastic. At midrange compositions between the two glass transition temperatures, materials exhibiting leathery behavior are obtained.
As the compatibility of the two IPN components is increased, the glass transition behavior changes from two distinct transitions to one broad transition in a systematic manner. It is concluded that a broadened transition can result, even in thermodynamically compatible mixes, if the minimum volume required for independent contribution to the relaxation spectrum is subject to wide composition variation.
KeywordsBlock Copolymer Methyl Methacrylate Interpenetrate Polymer Network Ethyl Acrylate Plastic Component
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