Preparation of microfibers by ice-segregation-induced self- assembly of hollow PNIPAM microgels
A new hydrogel microfiber with dense pore structure was prepared by ice-segregation-induced self-assembly process. Mono-dispersed silica/poly (N-isopropylacrylamide (PNIPAM) core-shell composite microgels were firstly synthesized by seed-emulsion polymerization. 3-(trimethoxysilyl)propyl methacrylate modified colloidal silica particles were used as seeds, N-isopropylacrylamide (NIPAM) was used as monomer and N,N’-methylene-bis-acrylamide (MBA) was used as crosslinker. Then thermo-responsive hollow PNIPAM microgels were produced by removing the silica cores of the SiO2/PNIPAM core-shell composite microgels by chemical etching and using hydrofluoric acid. Finally hydrogel microfibers were made by unidirectional freezing with 1 wt% aqueous hollow PNIPAM microgel dispersion in liquid nitrogen bath, and the formed ice crystals were removed by freeze-drying. Many orderly arrayed dents were observed on the surface of the hydrogel microfibers by field-emission scanning electron microscopy, which indicates dense packed mono-dispersed hollow PNIPAM microgels formed.
LIU Xiaoyun JIANG Zijun YANG Jianmao ZHA Liusheng
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University,S Research Center for Analysis and Measurement,Donghua University,Shanghai 201620, P.R.China
国际会议
2009 International Conference on Advanced Fibers and Polymer Materials(2009年先进纤维与聚合物材料国际学术会议)
上海
英文
617-620
2009-10-21（万方平台首次上网日期，不代表论文的发表时间）