Platinum Atoms Dispersed in Single-chain Polymer Nanoparticles
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ARTICLE
POLYMER SCIENCE
https://doi.org/10.1007/s10118-021-2499-x Chinese J. Polym. Sci.
Platinum Atoms Dispersed in Single-chain Polymer Nanoparticles Zhi-Yu Hua,b, Hong-Ting Pua,b*, and Jian-Guo Wub a Department of Polymeric Materials, School of Materials Science & Engineering, Tongji University, Shanghai 201804, China b Key Laboratory of Advanced Civil Engineering Materials, School of Materials Science & Engineering, Tongji University, Shanghai 201804, China
Electronic supplementary information Abstract The intramolecular cross-linking of single polymer chains can form single-chain nanoparticles (SCNPs), which have many applications. In this study, styrenic copolymers with pendent triphenylphosphine as the coordination site for platinum ions (Pt(II)) and benzocyclobutene as the latent reactive groups are synthesized. Triphenylphosphine groups in the chains can coordinate Pt(II) and aid slight single-chain folding in dilute solution. The intramolecular cross-linking caused by the ring-open reaction of benzocyclobutene completes the single-chain collapse and forms stable SCNPs in dilute solution. Pt(II) embedded in SCNPs can be further reduced to platinum atoms (Pt(0)). Pt(0) steadily and atomically dispersed in SCNPs exhibits better catalytic properties than normal polymer carried platinum particles do for the reduction of p-nitrophenol to p-aminophenol. Keywords Single-chain; Polymer nanoparticles; Intramolecular cross-linking; Platinum; Coordination Citation: Hu, Z. Y.; Pu, H. T.; Wu, J. G. Platinum atoms dispersed in single-chain polymer nanoparticles. Chinese J. Polym. Sci. https://doi.org/10.1007/s10118-021-2499-x
INTRODUCTION The preparation of polymer nanoparticles with a controlled size and pre-determined arrangement of functional groups is an important area, which is driven by the use of these tailor-made, functional nanoparticles in a variety of applications.[1−3] The intramolecular collapse of single polymer chains assisted by intramolecular cross-linking can form single-chain nanoparticles (SCNPs), which can be widely used in many fields such as electronics,[4,5] catalysts,[6,7] nanomedicines,[8,9] and so on. The intramolecular cross-linking can be classified into irreversible covalent bonding,[10,11] dynamic covalent bonding,[12,13] and noncovalent interaction.[14,15] Many studies have reported the strategies involving the intramolecular coupling of single-chain polymer nanoparticles comprised of two steps.[16] In simple terms, the first step contains the synthesis of cross-linkable linear polymers[17] and the second involves the preparation of single-chain nanoparticles in ultra-dilute solution.[18,19] Compared with inorganic nanoparticles which depend on the environmental condition or the designed template,[20] SCNPs rely on the molecular weight and content of intramolecular cross-linking groups, which can be held steady in the polymerization.[21,22] Consequently, various SCNPs with different functions can be obtained via combining diverse functional monomers and cross-linkable mo
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