Effect of the composition of methanol-water mixtures on tacticity of poly(N-ethylacrylamide) gel

Two series of macroporous poly(N-ethylacrylamide) (PNEAM) gels are synthesized in different composition of methanol-water mixtures (xm=0, 0.06, 0.13, 0.21, 0.31, and 0.43; where xm=mole fraction of methanol) in presence as well as in the absence of 0.1M Y(OTf)3 Lewis acid as additive. The gels synthesized in the absence of Lewis acid are atactic and in the presence of the same are isotactic. Synthesis of the corresponding linear PNEAM homopolymers shows that, the isotacticity (meso dyad, %) of the resulted polymers increases for the gels prepared in the presence of Lewis acid (LA) and remains constant for the gel prepared in the absence of LA, respectively, with the increase in the concentration of the synthesis solvent methanol. SEM micrographs reveal that, the hydrogels synthesized in the presence of LA are more porous than the gels prepared in the absence of LA. Swelling ratio of all the hydrogels decreases with the increase in the temperature and LA gels show higher swelling ratio values than non LA gels (NLA). Deswelling rate of the hydrogels prepared in methanol-water mixture in presence of LA is faster than the hydrogels prepared in absence of LA. Moreover, reswelling rate increases with increase in the isotacticity of the PNEAM segment in the gel. All these results have been explained on the basis of the formation of highly porous hydrogels with higher isotactic PNEAM chain segment in the presence of LA in methanol-water mixtures. © 2014 Wiley Periodicals, Inc.

Dergi Adı Journal of Applied Polymer Science
Dergi Cilt Bilgisi 132
Dergi Sayısı 12
Sayfalar -
Yayın Yılı 2015
Eser Adı
[dc.title]
Effect of the composition of methanol-water mixtures on tacticity of poly(N-ethylacrylamide) gel
Yazar
[dc.contributor.author]
Biswas, Chandra Sekhar
Yazar
[dc.contributor.author]
Sulu, Elvan
Yazar
[dc.contributor.author]
Hazer, Baki
Yayın Yılı
[dc.date.issued]
2015
Yayıncı
[dc.publisher]
John Wiley and Sons Inc.
Yayın Türü
[dc.type]
article
Özet
[dc.description.abstract]
Two series of macroporous poly(N-ethylacrylamide) (PNEAM) gels are synthesized in different composition of methanol-water mixtures (xm=0, 0.06, 0.13, 0.21, 0.31, and 0.43; where xm=mole fraction of methanol) in presence as well as in the absence of 0.1M Y(OTf)3 Lewis acid as additive. The gels synthesized in the absence of Lewis acid are atactic and in the presence of the same are isotactic. Synthesis of the corresponding linear PNEAM homopolymers shows that, the isotacticity (meso dyad, %) of the resulted polymers increases for the gels prepared in the presence of Lewis acid (LA) and remains constant for the gel prepared in the absence of LA, respectively, with the increase in the concentration of the synthesis solvent methanol. SEM micrographs reveal that, the hydrogels synthesized in the presence of LA are more porous than the gels prepared in the absence of LA. Swelling ratio of all the hydrogels decreases with the increase in the temperature and LA gels show higher swelling ratio values than non LA gels (NLA). Deswelling rate of the hydrogels prepared in methanol-water mixture in presence of LA is faster than the hydrogels prepared in absence of LA. Moreover, reswelling rate increases with increase in the isotacticity of the PNEAM segment in the gel. All these results have been explained on the basis of the formation of highly porous hydrogels with higher isotactic PNEAM chain segment in the presence of LA in methanol-water mixtures. © 2014 Wiley Periodicals, Inc.
Kayıt Giriş Tarihi
[dc.date.accessioned]
2019-12-23
Açık Erişim Tarihi
[dc.date.available]
2019-12-23
Yayın Dili
[dc.language.iso]
eng
Konu Başlıkları
[dc.subject]
gels
Konu Başlıkları
[dc.subject]
morphology
Konu Başlıkları
[dc.subject]
stereochemistry and tacticity
Konu Başlıkları
[dc.subject]
stimuli-sensitive polymers
Konu Başlıkları
[dc.subject]
swelling
Künye
[dc.identifier.citation]
Biswas, C. S., Sulu, E. ve Hazer, B. (2015). Effect of the composition of methanol−water mixtures on tacticity of poly(N-ethylacrylamide) gel. Journal of Applied Polymer Science, 132(12). doi:10.1002/app.41668
Haklar
[dc.rights]
info:eu-repo/semantics/closedAccess
ISSN
[dc.identifier.issn]
0021-8995
Dergi Adı
[dc.relation.journal]
Journal of Applied Polymer Science
Dergi Sayısı
[dc.identifier.issue]
12
Dergi Cilt Bilgisi
[dc.identifier.volume]
132
Tek Biçim Adres
[dc.identifier.uri]
https://dx.doi.org/10.1002/app.41668
Tek Biçim Adres
[dc.identifier.uri]
https://hdl.handle.net/20.500.12628/5391
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presence absence hydrogels prepared increase methanol-water synthesized isotacticity segment higher isotactic increases mixtures porous Swelling decreases temperature Periodicals swelling values explained results formation highly reswelling micrographs Moreover faster mixture Deswelling reveal Y(OTf)3 methanol) fraction xm=mole
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