Triblock copolymers

r, h cks, sist pe ono softening; however, this lability of the mechanical response is largely reversible. Since the repeat units of ing dis] due t strain-ization elastomers are particularly intriguing for their commercial poten-tial [17e21]. Recently the controlled/living emulsion copolymerization of isobutylene with 2,6-dimethyl-2,4,6-octatriene (alloocimene or high allo content, ciently and much racterize the me-e in a poly(allo)-b-Isobutylene and alloocimene were sequentially reacted to form the triblock, with details of the synthesis found elsewhere [24]. The polymer studied herein had a number average molecular weight of 260 kg/mol (polydispersity 1.6). The respective block molecular weights were in the ratio 0.21:1:0.13, with the allo content from 1H NMR equal to 25.5 % by weight. Dynamic mechanical experiments were carried out on an Anton Paar MCR 502 using a parallel plate geometry at low strains, and with a cone and plate geometry to quantify the strain dependence. The surface of a spin-coated * Corresponding author