期刊
CHEMISTRY-AN ASIAN JOURNAL
卷 15, 期 16, 页码 2499-2504出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/asia.202000621
关键词
hyperbranched polymers; amino-yne click reaction; nanocatalyst; reduction reaction
资金
- National Natural Science Foundation of China [21901206/51973119]
- Shaanxi Province Natural Science Basic Research Program [2019JLM-46]
- Shaanxi Coal Chemical Group Co., Ltd. [2019JLM-46]
- Polymer Electromagnetic Functional Materials Innovation Team of Shaanxi Sanqin Scholars
Hyperbranched polymers have garnered much attention due to attractive properties and wide applications, such as drug-controlled release, stimuli-responsive nano-objects, photosensitive materials and catalysts. Herein, two types of novel hyperbranched poly(ester-enamine) (hb-PEEa) were designed and synthesized via the spontaneous amino-yne click reaction of A(2)monomer (1, 3-bis(4-piperidyl)-propane (A(2a)) or piperazine (A(2b))) and B(3)monomer (trimethylolpropanetripropiolate). According to Flory's hypothesis, gelation is an intrinsic problem in an ideal A(2)+B(3)polymerization system. By controlling the polymerization conditions, such as monomer concentration, molar ratio and rate of addition, a non-ideal A(2)+B(3)polymerization system can be established to avoid gelation and to synthesize soluble hb-PEEa. Due to abundant unreacted alkynyl groups in periphery, the hb-PEEa can be further functionalized by different amino compounds or their derivates. The as-prepared amphiphilic PEG-hb-PEEa copolymer can readily self-assemble into micelles in water, which can be used as surfactant to stabilize Au nanoparticles (AuNPs) during reduction of NaBH(4)in aqueous solution. As a demonstration, the as-prepared PEG-hb-PEEa-supported AuNPs demonstrate good dispersion in water, solvent stability and remarkable catalytic activity for reduction of nitrobenzene compounds.
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