writer：Guangyu Liu, Xinlin Yang*, Yongmei Wang
keywords：distillation precipitation polymerization; hydrophilic polymer microspheres;
source：期刊
specific source：Polym. Int., 56, 905-913 (2007). DOI: 10.1002/pi2223
Issue time：2007年
Highly crosslinked cauliflower-like poly(N,N
-methylenebisacrylamide) particles were prepared by distillation precipitation polymerization in neat acetonitrile with 2,2
-azobisisobutyronitrile as initiator. Monodisperse hydrophilic polymer microspheres with various functional groups, such as amide, pyrrolidone and carboxylic acid, with a spherical shape and smooth surface in the size range 120–600nm were prepared by distillation precipitation copolymerizations of functional comonomers including N-isopropylacrylamide, Nvinylpyrrolidone, methacrylic acid with N,N
-methylenebisacrylamide as crosslinker. The polymer particles were
formed and precipitated out from the reaction medium during the distillation of the solvent from the reaction system through an entropic precipitation manner. The effects of the solvent and the degree of crosslinking on the morphology and the loading capacity of the functional groups of the resultant polymer particles were investigated. The resulting polymer particles were characterized with scanning electron microscopy, transmission electron
microscopy, dynamic light scattering and Fourier transform infrared spectroscopy.