Structure and properties of styrenic thermoplastic elastomer functionalised through ozone treatment

Abstract

Styrenic thermoplastic elastomers are hydrophobic polymer. Through ozone treatment, some oxygen containing groups such as carboxyl groups [C5O(O)] are introduced onto the molecular chains of styrenic thermoplastic elastomers [poly(styrene-b-butadiene-b-styrene) (SBS) and hydrogenated poly(styrene-b-isoprene/butadiene-b-styrene) (SEEPS)], their hydrophilicity are thus improved. Compared with SEEPS4044, SBS791 contains much more C5C double bonds and is more susceptible to ozone oxidation. The polarity of ozonised SBS791 is higher than that of ozonised SEEPS4044. Ozone treatment causes also the degradation of styrenic thermoplastic elastomers, their molecular weights are decreased. After ozone treatment, the tensile strength at 100 and 300% elongation of styrenic thermoplastic elastomers decreases.

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