Control of poly(N-isopropylacrylamide) microgel network structure by precipitation polymerization near the lower critical solution temperature.
Control of poly(N-isopropylacrylamide) microgel network structure by precipitation polymerization near the lower critical solution temperature.
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DOI:
10.1021/la200114s
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发表时间:
2011-04-05
期刊:
影响因子:
--
通讯作者:
Lyon LA
中科院分区:
文献类型:
--
作者:
Hu X;Tong Z;Lyon LA
Poly(N-isopropylacrylamide)(pNIPAm) microgels were synthesized by precipitation polymerization at temperatures ranging from 37 °C to 45 °C using the redox initiator system ammonium persulfate (APS)/N,N,N’,N’-tetramethylethylenediamine (TEMED), or the photoinitiator 2,2′-azobis(amidinopropane) dihydrochloride (V50). Photon correlation spectroscopy (PCS) and atomic force microscopy (AFM) studies revealed that spherical microgels with narrow size dispersities can be obtained with these methods, and that the resultant microgels have volume phase transition behaviors expected from their compositions. Additionally, the low temperature, redox initiator strategy produces microgels devoid of self-cross-linking, thereby permitting the synthesis of completely degradable microgels when using N,N’-(1,2-dihydroxyethylene)bisacrylamide (DHEA) as a cleavable cross-linker. We also demonstrate the potential utility of the approach in bioconjugate syntheses; in this case avidin immobilization is demonstrated by one-pot copolymerization at low temperature.
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