Abstract
Abstract PEBA block copolymers with hard segments (polyamide) and soft segments (polyether) are thermoplastic elastomers which can absorb up to 120% of water. The morphological and mechanical properties of these materials, with PA6 and PA12 hard segments, are studied as a function of the amount of absorbed water. The main effect of water in PA6-polyether block copolymer is to decrease the crystallinity of the PA sequences and the ultimate mechanical properties, whereas water changes weakly the properties of copolymer with PA12 hard segments. The analogy with cross-linked rubbers is discussed (molecular weight between crosslinks Mc; Mooney and Rivlin behavior; Mullins effect; rupture).
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