A tetrablock copolymer polyisoprene- block -poly( tert -butyl acrylate)- block -poly[(2-cinnamoyloxyethyl methacrylate)- ran -(2-hydroxyethyl methacrylate)]- block -poly(solketal methacrylate), or PI- b -P t BA- b -P(CEMA- r -HEMA)- b -PSMA, was synthesized and characterized. After PSMA hydrolysis to poly(glyceryl methacrylate), or PGMA, the tetrablock formed cylindrical aggregates in water with a PGMA corona and an insoluble part consisting of PI and P(CEMA- r -PHEMA) core−shell cylinders that sandwich a P t BA thin layer. Water-dispersible nanotubes were obtained after the cross-linking of the P(CEMA- r -HEMA) layer and cleavage of the PI cores with ozone. Both nanotubes containing some ozonized PI fragments and the cross-linked PI- b -P t BA- b -P(CEMA- r -HEMA)- b -PGMA cylindrical aggregates sorbed Pd 2+ from dimethylformamide as a result of the π-allyl complex formation between Pd 2+ and the PI double bonds. The sorbed Pd 2+ was reduced to Pd nanoparticles, and the particles were made to overlap by catalyzing further Pd deposition on them in an electroless Pd plating bath. These polymer/metal hybrid nanofibers with conductive cores may be useful as nanocables or as a catalyst for reagents that can permeate the P(CEMA- r -PHEMA) layer.
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Li et al. (2003) studied this question.