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Volumn 47, Issue 10, 2009, Pages 2539-2550

Heterotactic-specific radical polymerization of N-isopropylacrylamide and phase transition behavior of aqueous solution of heterotactic poly(N-isopropylacrylamide)

Author keywords

Heterotactic; Hydrogen bonding; N isopropylacrylamide; Radical polymerization; Stereospecific polymers; Stimuli sensitive polymers

Indexed keywords

HETEROTACTIC; HYDROGEN BONDING; N-ISOPROPYLACRYLAMIDE; RADICAL POLYMERIZATION; STEREOSPECIFIC POLYMERS; STIMULI-SENSITIVE POLYMERS;

EID: 66249119703     PISSN: 0887624X     EISSN: 10990518     Source Type: Journal    
DOI: 10.1002/pola.23338     Document Type: Article
Times cited : (29)

References (40)
  • 14
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    • Yamada, K.; Nakano, T.; Okamoto, Y. Macromole- cules 1998, 31, 7598-7605.
    • Yamada, K.; Nakano, T.; Okamoto, Y. Macromole- cules 1998, 31, 7598-7605.
  • 32
    • 66249095445 scopus 로고    scopus 로고
    • PenøH-F8 was chosen, because its boiling point (140-141 °C) is higher than the measurement temperature (100 °C).
    • PenøH-F8 was chosen, because its boiling point (140-141 °C) is higher than the measurement temperature (100 °C).
  • 35
    • 66249105821 scopus 로고    scopus 로고
    • The K value at 0 °C was underestimated, probably because the degree of association was too large to determine K under the given conditions.
    • The K value at 0 °C was underestimated, probably because the degree of association was too large to determine K under the given conditions.
  • 37
    • 66249102444 scopus 로고    scopus 로고
    • As described at the section on mechanism, the heterotactic-specificity would be induced when propagating reaction proceeds between the NIPAAm complexed with RfOH and the radical bound with RfOHs at the antepenultimate, penultimate, and chain-end monomeric units. If assuming that degree of association between 3 and monomeric unit near the propagating chain-end is the same as that for the NIPAAm-3 complex, probability of the aforementioned propagating reaction in the presence of an equimolar amount of 3 is calculated to be 0.85. Furthermore, it is assumed that the radicals bound with RfOHs favor propagating reaction with uncomplexed monomer more than complexed monomer, because of the repulsion of fluorine atoms in complexed radicals and complexed monomers. Therefore, it is reasonable that the heterotactic-specificity induced by an equimolar amount of 3 significantly decreased compared with that by a twofold amount of 3, although the difference in degree
    • As described at the section on mechanism, the heterotactic-specificity would be induced when propagating reaction proceeds between the NIPAAm complexed with RfOH and the radical bound with RfOHs at the antepenultimate, penultimate, and chain-end monomeric units. If assuming that degree of association between 3 and monomeric unit near the propagating chain-end is the same as that for the NIPAAm-3 complex, probability of the aforementioned propagating reaction in the presence of an equimolar amount of 3 is calculated to be 0.85. Furthermore, it is assumed that the radicals bound with RfOHs favor propagating reaction with uncomplexed monomer more than complexed monomer, because of the repulsion of fluorine atoms in complexed radicals and complexed monomers. Therefore, it is reasonable that the heterotactic-specificity induced by an equimolar amount of 3 significantly decreased compared with that by a twofold amount of 3, although the difference in degree of association of the NIPAAm-3 complex was only 4%.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.