Abstract
Monodisperse hydrogel microspheres (microgels) were prepared by precipitation polymerization from acrylamide (AAm), methylenebisacrylamide (MBAAm), and methacrylic acid (MAc) in isopropanol. MAc was found to be essential for the preparation of fine spherical particles. The structural analysis of microgels at each step of conversion suggests that the precipitation polymerization proceeds in two steps of (1) the formation of star-shaped nuclei mainly by crosslinking agents and the coupling of the nuclei to constitute a network structure, and (2) the incorporation of remaining acrylamide onto the microgel surface and the further crosslinking with free double bonds in microgels. The particle size was found to depend on various polymerization conditions, including the monomer composition, the amount of initiator and the total monomer concentration. The internal structure of microgels was observed by small-angle X-ray scattering (SAXS). The scattering profile was analyzed by Fourier-transformation to yield the distance distribution function p(r), and by fitting an assumed scattering function to evaluate the correlation length ξ and the fractal dimension D.
| Original language | English |
|---|---|
| Pages (from-to) | 309-316 |
| Number of pages | 8 |
| Journal | Polymer Journal |
| Volume | 28 |
| Issue number | 4 |
| Publication status | Published - 1996 |
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Keywords
- Hydrogel Precipitation
- Microsphere
- Polymerization
- Small-Angle
- X-Ray Scattering
ASJC Scopus subject areas
- Materials Chemistry
- Polymers and Plastics
Cite this
Preparation and structural characterization of hydrogel microspheres. / Kamijo, Yukiko; Fujimoto, Keiji; Kawaguchi, Haruma; Yuguchi, Yoshiaki; Urakawa, Hiroshi; Kajiwara, Kanji.
In: Polymer Journal, Vol. 28, No. 4, 1996, p. 309-316.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Preparation and structural characterization of hydrogel microspheres
AU - Kamijo, Yukiko
AU - Fujimoto, Keiji
AU - Kawaguchi, Haruma
AU - Yuguchi, Yoshiaki
AU - Urakawa, Hiroshi
AU - Kajiwara, Kanji
PY - 1996
Y1 - 1996
N2 - Monodisperse hydrogel microspheres (microgels) were prepared by precipitation polymerization from acrylamide (AAm), methylenebisacrylamide (MBAAm), and methacrylic acid (MAc) in isopropanol. MAc was found to be essential for the preparation of fine spherical particles. The structural analysis of microgels at each step of conversion suggests that the precipitation polymerization proceeds in two steps of (1) the formation of star-shaped nuclei mainly by crosslinking agents and the coupling of the nuclei to constitute a network structure, and (2) the incorporation of remaining acrylamide onto the microgel surface and the further crosslinking with free double bonds in microgels. The particle size was found to depend on various polymerization conditions, including the monomer composition, the amount of initiator and the total monomer concentration. The internal structure of microgels was observed by small-angle X-ray scattering (SAXS). The scattering profile was analyzed by Fourier-transformation to yield the distance distribution function p(r), and by fitting an assumed scattering function to evaluate the correlation length ξ and the fractal dimension D.
AB - Monodisperse hydrogel microspheres (microgels) were prepared by precipitation polymerization from acrylamide (AAm), methylenebisacrylamide (MBAAm), and methacrylic acid (MAc) in isopropanol. MAc was found to be essential for the preparation of fine spherical particles. The structural analysis of microgels at each step of conversion suggests that the precipitation polymerization proceeds in two steps of (1) the formation of star-shaped nuclei mainly by crosslinking agents and the coupling of the nuclei to constitute a network structure, and (2) the incorporation of remaining acrylamide onto the microgel surface and the further crosslinking with free double bonds in microgels. The particle size was found to depend on various polymerization conditions, including the monomer composition, the amount of initiator and the total monomer concentration. The internal structure of microgels was observed by small-angle X-ray scattering (SAXS). The scattering profile was analyzed by Fourier-transformation to yield the distance distribution function p(r), and by fitting an assumed scattering function to evaluate the correlation length ξ and the fractal dimension D.
KW - Hydrogel Precipitation
KW - Microsphere
KW - Polymerization
KW - Small-Angle
KW - X-Ray Scattering
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UR - http://www.scopus.com/inward/citedby.url?scp=0029722023&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:0029722023
VL - 28
SP - 309
EP - 316
JO - Polymer Journal
JF - Polymer Journal
SN - 0032-3896
IS - 4
ER -