Abstract
A feasible method to prepare single-chain polymer nanoparticles (SCNPs) loading metal catalysts via intramolecular collapse of the linear polymers is proposed. Styrene sulfonyl azide/acrylonitrile copolymers are synthesized via reversible addition-fragmentation chain transfer (RAFT) polymerization. Acrylonitrile moieties in the copolymers can adsorb cupric ions and form SCNPs via the thermal decomposition of pendant sulfonyl azide and subsequent intramolecular cross-linking. Then L(+)-ascorbic acid sodium salt is used to reduce these cupric ions into cuprous nanoparticles in SCNPs. The mean diameter of composite SCNPs is in the range of 10–30 nm, in which cuprous moieties (diameter 5–10 nm) are implanted. The size of SCNPs has significant influences on the diameter of loaded cuprous moieties. It is indicated that these single-chain polymer nanoparticles carried cuprous exhibit better catalytic properties for the click reaction of alkyne and azide.
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