Langmuir, 28, 14954–14959: Single-Chain Polymers Achieved from Radical Polymerization under Single-Initiator Conditions
作者：Shen Zhang, Xiangchao Pang, Dameng Guo, Bo Zheng, Shuxun Cui,* Hongwei Ma*
關鍵字：SIP, Single-Chain Polymers
論文來源：期刊
具體來源：Langmuir, 28, 14954–14959
發(fā)表時間：2012年
Radical polymerization from a single initiator molecule in a microenvironment is a nearly ideal system in which bimolecular termination, solution concentration, and viscosity changes could be neglected. In this study, we provide two facile methods of preparing polymers via atom-transfer radical polymerization (ATRP) under single-initiator conditions: tether initiators on planar substrates at superlow density through mixed self-assembled monolayers (SAMs) and encapsulated single initiators in microfluidic droplets. The molecular weight (MW) of the resultant polymers characterized by atomic force microscope-based single-molecule force spectroscopy (AFM-based SMFS) showed that the singlechain ATRP had an extraordinarily faster chain propagation rate (2 unit/s) on planar substrates and gave polymers with much higher MWs (105?106 g/mol) than those obtained from traditional ATRP (103?105 g/mol). The former method offered a general platform for single-chain polymer synthesis and investigation, and the latter could be amplified to obtain abundant single-chain polymers with ultrahigh molecular weight (UHMW) for commercial applications.