论文部分内容阅读
We recently demonstrated that it was possible to design a new type of elastomer,able to deform reversibly up to more than 100% strain with very little hysteresis,while being significantly tougher than conventional elastomers1,2.These new materials are composed of two or more interpenetrated networks synthesized by sequences of swelling and polymerizations,creating therefore different populations of chains with a variable level of prestretch.Depending on the volume fraction of first network,various types of mechanical behavior are observed.For a high volume fraction of first network (> 25% in our system),the sample breaks before any significant strain stiffening is observed in uniaxial extension and the elastomers are brittle.For intermediate levels of volume fraction (7-25%),the materials are more extensible an remain reversibly elastic but their stress at break significantly increases.