TY - JOUR
T1 - Heterogeneous surface saponification of suspension-polymerized monodisperse poly(vinyl acetate) microspheres using various ions
AU - Lee, Se Geun
AU - Kim, Jae Pil
AU - Kwon, Ick Chan
AU - Park, Ki Hong
AU - Noh, Seok Kyun
AU - Han, Sung Soo
AU - Lyoo, Won Seok
PY - 2006/6/1
Y1 - 2006/6/1
N2 - Poly(vinyl alcohol) (PVA)/poly(vinyl acetate) (PVAc) microspheres with a skin/core structure were prepared through the heterogeneous surface saponification of PVAc microspheres suspension-polymerized. The PVA skin formed through the heterogeneous saponification was hydrogel swellable in water. In addition, to obtain monodisperse PVA/PVAc microspheres having various skin/core ratios and morphologies, the ion-specificities to the heterogeneous saponification were investigated using SO42, Cl -, NO3-, Br-, and I- for anions and Li+, Na+, and K+ for cations, respectively. The ions were not specific significantly to the rate of the heterogeneous saponification, while were related to the degree of saponification (DS). DSs had different values between by weight loss (DSW) and by proton nuclear magnetic resonance spectroscopy (DSNMR) measurements. The order of DSws was SO42- < Cl- < NO3- < Br- < I- for anions and K+ < Na+ < Li+ for cations, and that of DSNMRS, I- < Br- < NO 3- < Cl- < SO42- for anions and Li+ < Na+ < K+ for cations. The differences in values between DSws and DSNMRs were caused by the dissolution of PVA skin and were significantly decreased for SO42-. The peaks at melting temperature of PVA were sharp and their areas were large for ions deswelling PVA skins.
AB - Poly(vinyl alcohol) (PVA)/poly(vinyl acetate) (PVAc) microspheres with a skin/core structure were prepared through the heterogeneous surface saponification of PVAc microspheres suspension-polymerized. The PVA skin formed through the heterogeneous saponification was hydrogel swellable in water. In addition, to obtain monodisperse PVA/PVAc microspheres having various skin/core ratios and morphologies, the ion-specificities to the heterogeneous saponification were investigated using SO42, Cl -, NO3-, Br-, and I- for anions and Li+, Na+, and K+ for cations, respectively. The ions were not specific significantly to the rate of the heterogeneous saponification, while were related to the degree of saponification (DS). DSs had different values between by weight loss (DSW) and by proton nuclear magnetic resonance spectroscopy (DSNMR) measurements. The order of DSws was SO42- < Cl- < NO3- < Br- < I- for anions and K+ < Na+ < Li+ for cations, and that of DSNMRS, I- < Br- < NO 3- < Cl- < SO42- for anions and Li+ < Na+ < K+ for cations. The differences in values between DSws and DSNMRs were caused by the dissolution of PVA skin and were significantly decreased for SO42-. The peaks at melting temperature of PVA were sharp and their areas were large for ions deswelling PVA skins.
KW - Heterogeneous saponification
KW - Ion-specificity
KW - PVA/PVAc microspheres
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U2 - 10.1002/pola.21406
DO - 10.1002/pola.21406
M3 - Article
AN - SCOPUS:33744806893
SN - 0887-624X
VL - 44
SP - 3567
EP - 3576
JO - Journal of Polymer Science, Part A: Polymer Chemistry
JF - Journal of Polymer Science, Part A: Polymer Chemistry
IS - 11
ER -