TY - JOUR
T1 - Structure of water in the vicinity of amphoteric polymers as revealed by Raman spectroscopy
AU - Kitano, Hiromi
AU - Nagaoka, Kyoko
AU - Tada, Susumu
AU - Gemmei-Ide, Makoto
N1 - Funding Information:
This work was supported by Grants-in-Aid (16205015, 17750105 and 19350055) from the Japan Society for the Promotion of Science. The authors are indebted to the Toyama Prefecture New Century Foundation, Toyama, Japan, for its financial support. M.G.-I. wishes to thank the Sekisui Science Foundation, Osaka, Japan, for its financial support. The authors are grateful to Mr. K. Takaha of this laboratory for his technical assistance.
PY - 2007/9/15
Y1 - 2007/9/15
N2 - The structure and hydrogen bonding of water in an aqueous solution of amphoteric copolymers (poly(MA-r-DMAPMA), 3 × 103 < Mw < 104) composed of various ratios of methacrylic acid (MA) and N-[3-(dimethylamino)propyl]methacrylamide (DMAPMA) were analyzed using the band shapes of the O{single bond}H stretching in the polarized Raman spectra. The number of hydrogen bonds disrupted due to the presence of one monomer residue (Ncorr value) evaluated for poly(methacrylic acid) was largely positive, and with an increase in the content of the DMAPMA residue, the Ncorr value became smaller, and after passing a minimum (which was still slightly positive) at a roughly equivalent molar ratio (P(M47D53); M, methacrylic acid; D, N-[3-(dimethylamino)propyl]methacrylamide), increased again. This is in a significant contrast with the largely positive Ncorr values for the homopolymers of MA and DMAPMA, and other ordinary polyelectrolytes. The small Ncorr value for P(M47D53) was comparable to those for water-soluble nonionic polymers such as poly(ethylene glycol) and zwitterionic polymers such as polycarboxybetaine. These results suggested that the balance of electric charges in polymeric materials is important to be inert to the structure of vicinal water.
AB - The structure and hydrogen bonding of water in an aqueous solution of amphoteric copolymers (poly(MA-r-DMAPMA), 3 × 103 < Mw < 104) composed of various ratios of methacrylic acid (MA) and N-[3-(dimethylamino)propyl]methacrylamide (DMAPMA) were analyzed using the band shapes of the O{single bond}H stretching in the polarized Raman spectra. The number of hydrogen bonds disrupted due to the presence of one monomer residue (Ncorr value) evaluated for poly(methacrylic acid) was largely positive, and with an increase in the content of the DMAPMA residue, the Ncorr value became smaller, and after passing a minimum (which was still slightly positive) at a roughly equivalent molar ratio (P(M47D53); M, methacrylic acid; D, N-[3-(dimethylamino)propyl]methacrylamide), increased again. This is in a significant contrast with the largely positive Ncorr values for the homopolymers of MA and DMAPMA, and other ordinary polyelectrolytes. The small Ncorr value for P(M47D53) was comparable to those for water-soluble nonionic polymers such as poly(ethylene glycol) and zwitterionic polymers such as polycarboxybetaine. These results suggested that the balance of electric charges in polymeric materials is important to be inert to the structure of vicinal water.
KW - Amphoteric polymer
KW - Hydrogen-bonded network
KW - O{single bond}H stretching
KW - Raman spectroscopy
KW - Water structure
UR - http://www.scopus.com/inward/record.url?scp=34547227688&partnerID=8YFLogxK
U2 - 10.1016/j.jcis.2007.05.009
DO - 10.1016/j.jcis.2007.05.009
M3 - 学術論文
C2 - 17543983
AN - SCOPUS:34547227688
SN - 0021-9797
VL - 313
SP - 461
EP - 468
JO - Journal of Colloid and Interface Science
JF - Journal of Colloid and Interface Science
IS - 2
ER -