Preparation of Molecularly Imprinted Polymers via Atom Transfer Radical "Bulk" Polymerization
作者：Baiyi Zu, Ying Zhang, Xianzhi Guo, Huiqi Zhang*
關(guān)鍵字：Molecularly imprinted polymers, atom transfer radical "bulk" polymerization
論文來(lái)源：期刊
具體來(lái)源：J Polym Sci, Part A: Polym Chem 2010, 48(3), 532-541.
發(fā)表時(shí)間：2010年
The first application of atom transfer radical "bulk" polymerization (ATRBP) in molecular imprinting is described, which provides molecularly imprinted polymers (MIPs) with obvious imprinting effects towards the template, very fast binding kinetics, and an appreciable selectivity over structurally related compounds. In comparison with the MIP prepared via the normally used traditional "bulk" free radical polymerization (BFRP), the MIPs obtained via ATRBP showed somewhat lower binding capacities and apparent maximum numbers N-max for high-affinity sites as well as quite similar binding association constants K-a for high-affinity sites and high-affinity site densities, in contrast with the previous reports (e.g., nitroxide/iniferter-mediated "bulk" polymerization provided MIPs with improved properties). This is tentatively ascribed to the occurrence of rather fast gelation process in ATRBP, which greatly restricted the mobility of the chemical species, leading to a heavily interrupted equilibrium between dormant species and active radicals and heterogeneous polymer networks. In addition, the general applicability of ATRBP was also confirmed by preparing MIPs for different templates. This work clearly demonstrates that applying controlled radical polymerizations (CRPs) in molecular imprinting not always benefits the binding properties of the resultant MIPs, which is of significant importance for the rational use of CRPs in generating MIPs with improved properties.