Synthesis and characterization of stereoregular poly(N-ethylacrylamide) hydrogel by using Y(OTf)(3) Lewis acid

Macroporous poly(N-ethylacrylamide) (PNEAM) hydrogels have been prepared in a methanol-water (1:1, v/v) mixture in the presence of 0, 0.05, 0.1, 0.15, and 0.2 M yttrium trifluoromethanesulfonate [Y(OTf)(3)] Lewis acid (LA) concentrations. SEM micrographs show that the resulted hydrogels are highly porous. Swelling ratios of all the hydrogels in water decrease with the increase in the temperature, and the hydrogels show lower critical solution temperature (LCST) volume phase transition at around 75 A degrees C. LCST of PNEAM homopolymers gradually increases with the increase in the isotacticity of the polymers. Moreover, the hydrogels show cononsolvency in different methanol-water mixtures at 50 A degrees C. Deswelling rate of the hydrogels prepared in the presence of LA is higher than the gel prepared in the absence of LA and this rate increases with increase in the LA concentration. The reswelling rate of the hydrogels also follows the same order, that is reswelling rate also increases with the increase in the LA loading in the gels. All these results are explained on the basis of the formation of the highly porous hydrogels with a higher isotactic PNEAM chain segment in a methanol-water mixture in the presence of LA.

Eser Adı
[dc.title]
Synthesis and characterization of stereoregular poly(N-ethylacrylamide) hydrogel by using Y(OTf)(3) Lewis acid
Yazar
[dc.contributor.author]
Biswas, Chandra Sekhar
Yazar
[dc.contributor.author]
Hazer, Baki
Yayın Yılı
[dc.date.issued]
2015
Yayıncı
[dc.publisher]
SPRINGER
Yayın Türü
[dc.type]
article
Özet
[dc.description.abstract]
Macroporous poly(N-ethylacrylamide) (PNEAM) hydrogels have been prepared in a methanol-water (1:1, v/v) mixture in the presence of 0, 0.05, 0.1, 0.15, and 0.2 M yttrium trifluoromethanesulfonate [Y(OTf)(3)] Lewis acid (LA) concentrations. SEM micrographs show that the resulted hydrogels are highly porous. Swelling ratios of all the hydrogels in water decrease with the increase in the temperature, and the hydrogels show lower critical solution temperature (LCST) volume phase transition at around 75 A degrees C. LCST of PNEAM homopolymers gradually increases with the increase in the isotacticity of the polymers. Moreover, the hydrogels show cononsolvency in different methanol-water mixtures at 50 A degrees C. Deswelling rate of the hydrogels prepared in the presence of LA is higher than the gel prepared in the absence of LA and this rate increases with increase in the LA concentration. The reswelling rate of the hydrogels also follows the same order, that is reswelling rate also increases with the increase in the LA loading in the gels. All these results are explained on the basis of the formation of the highly porous hydrogels with a higher isotactic PNEAM chain segment in a methanol-water mixture in the presence of LA.
Açıklama
[dc.description]
WOS: 000347696100012
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]
Poly(N-ethylacrylamide)
Konu Başlıkları
[dc.subject]
Thermoresponsive polymer
Konu Başlıkları
[dc.subject]
Stereoregularity
Konu Başlıkları
[dc.subject]
Lower critical solution temperature
Konu Başlıkları
[dc.subject]
Cononsolvency
Künye
[dc.identifier.citation]
Biswas, C. S. ve Hazer, B. (2015). Synthesis and characterization of stereoregular poly(N-ethylacrylamide) hydrogel by using Y(Otf)3 Lewis acid. Colloid and Polymer Science, 293(1), 143-152. doi:10.1007/s00396-014-3399-1
Haklar
[dc.rights]
info:eu-repo/semantics/closedAccess
ISSN
[dc.identifier.issn]
0303-402X
ISSN
[dc.identifier.issn]
1435-1536
Sponsor YAYINCI
[dc.description.sponsorship]
TUBITAK, Government of TurkeyTurkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK); TUBITAKTurkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [211T016]; Bulent Ecevit University Research FundBulent Ecevit University [BEU-2012-10-03-13]
Sponsor YAYINCI
[dc.description.sponsorship]
We gratefully acknowledge the financial support from TUBITAK, Government of Turkey, through 2216 fellowship program for the foreign citizens (CSB). This work was also supported by both TUBITAK (grant no. 211T016) and the Bulent Ecevit University Research Fund (#BEU-2012-10-03-13). We personally thank Elvan Sulu for her technical assistance.
İlk Sayfa Sayısı
[dc.identifier.startpage]
143
Son Sayfa Sayısı
[dc.identifier.endpage]
152
Dergi Adı
[dc.relation.journal]
COLLOID AND POLYMER SCIENCE
Dergi Sayısı
[dc.identifier.issue]
1
Dergi Cilt Bilgisi
[dc.identifier.volume]
293
Tek Biçim Adres
[dc.identifier.uri]
https://dx.doi.org/10.1007/s00396-014-3399-1
Tek Biçim Adres
[dc.identifier.uri]
https://hdl.handle.net/20.500.12628/3409
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08 Şubat 2024 15:53
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Tıklayınız
hydrogels increase prepared increases presence methanol-water highly porous temperature reswelling higher mixture degrees Deswelling mixtures different Moreover polymers cononsolvency Macroporous segment isotactic formation explained results absence loading follows concentration isotacticity (LCST) gradually [Y(OTf)(3)] trifluoromethanesulfonate yttrium
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