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Effects of pore-forming agents and polymer composition on the properties of novel poly(N,N-dimethylaminoethyl methacrylate sulfate-co-N,N-dimethylacrylamide) hydrogels / Gulten Gurdag in Industrial & engineering chemistry research, Vol. 50 N° 13 (Juillet 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 13 (Juillet 2011) . - pp. 8295-8303 Titre : Effects of pore-forming agents and polymer composition on the properties of novel poly(N,N-dimethylaminoethyl methacrylate sulfate-co-N,N-dimethylacrylamide) hydrogels Type de document : texte imprimé Auteurs : Gulten Gurdag, Auteur ; Aysegul Gokalp, Auteur Année de publication : 2011 Article en page(s) : pp. 8295-8303 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Polymer  composition  Novel  poly Résumé : Homopolymer of N,N-dimethylaminoethyl methacrylate sulfate (DMAEMASA) and its copolymer with N,N-dimethylacrylamide (DMAm) [P(DMAEMASA-co-DMAm)] were synthesized in the presence and absence ofpore-forming agents NaHCO3, poly(ethylene glycol) 2000 (PEG), and sucrose (SUC). The polymers were characterized by equilibrium swelling measurements (ESVs) in distilled water (20-60 °C) and buffer solutions (I=0.1 M, pH=2.2-10.0,20 °C), FTIR, DSC, and SEM methods. The presence of DMAm in monomer feed and the use of pore-forming agents during the polymerization enhanced the swelling of polymers. ESVs of both porous and nonporous PDMAEMASA and P(DMAEMASA-co-DMAm) gels decreased with pH, and displayed a phase transition at pH = 5. Among the pore-formers, NaHCO3 made the highest contribution to the swelling of polymers, but poly(ethylene glycol) and sucrose slightly affected the swelling values of gels. While glass transition temperature (Tg) of nonporous DMAEMASA homopolymer was determined to be 168.4 °C, Tgs of nonporous copolymer with 20- and 40-mol % DMAm were found to be 154.5 and 147.8 °C, respectively. Pore-formers decreased the Tg of homopolymer in the order NaHCO3 < PEG < SUC. In case of copolymers, NaHCO3 and PEG had nearly no effect on Tgs, but sucrose led to approximately 7 °C decrease in Tgs of copolymers. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24332155 [article] Effects of pore-forming agents and polymer composition on the properties of novel poly(N,N-dimethylaminoethyl methacrylate sulfate-co-N,N-dimethylacrylamide) hydrogels [texte imprimé] / Gulten Gurdag, Auteur ; Aysegul Gokalp, Auteur . - 2011 . - pp. 8295-8303. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 13 (Juillet 2011) . - pp. 8295-8303 Mots-clés : Polymer  composition  Novel  poly Résumé : Homopolymer of N,N-dimethylaminoethyl methacrylate sulfate (DMAEMASA) and its copolymer with N,N-dimethylacrylamide (DMAm) [P(DMAEMASA-co-DMAm)] were synthesized in the presence and absence ofpore-forming agents NaHCO3, poly(ethylene glycol) 2000 (PEG), and sucrose (SUC). The polymers were characterized by equilibrium swelling measurements (ESVs) in distilled water (20-60 °C) and buffer solutions (I=0.1 M, pH=2.2-10.0,20 °C), FTIR, DSC, and SEM methods. The presence of DMAm in monomer feed and the use of pore-forming agents during the polymerization enhanced the swelling of polymers. ESVs of both porous and nonporous PDMAEMASA and P(DMAEMASA-co-DMAm) gels decreased with pH, and displayed a phase transition at pH = 5. Among the pore-formers, NaHCO3 made the highest contribution to the swelling of polymers, but poly(ethylene glycol) and sucrose slightly affected the swelling values of gels. While glass transition temperature (Tg) of nonporous DMAEMASA homopolymer was determined to be 168.4 °C, Tgs of nonporous copolymer with 20- and 40-mol % DMAm were found to be 154.5 and 147.8 °C, respectively. Pore-formers decreased the Tg of homopolymer in the order NaHCO3 < PEG < SUC. In case of copolymers, NaHCO3 and PEG had nearly no effect on Tgs, but sucrose led to approximately 7 °C decrease in Tgs of copolymers. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24332155

Synthesis and characterization of novel poly (N - isopropylacrylamide - co - N,N' - dimethylaminoethyl methacrylate sulfate) hydrogels / Gulten Gurdag in Industrial & engineering chemistry research, Vol. 49 N° 24 (Décembre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 24 (Décembre 2010) . - pp. 12675-12684 Titre : Synthesis and characterization of novel poly (N - isopropylacrylamide - co - N,N' - dimethylaminoethyl methacrylate sulfate) hydrogels Type de document : texte imprimé Auteurs : Gulten Gurdag, Auteur ; Bestenur Kurtulus, Auteur Année de publication : 2011 Article en page(s) : pp. 12675-12684 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Hydrogels Résumé : Poly(N-isopropylacrylamide-co-N,N'-dimethylaminoethyl methacrylate sulfate) [P(NIPAM-co-DMAEMASA)] was prepared from N-isopropylacrylamide (NIPAM) and N,N-dimethylaminoethyl methacrylate sulfate (DMAEMASA) monomers, and its properties were compared with those of poly(N-isopropylacrylamide-co-N,N'-dimethylaminoethyl methacrylate) [P(NIPAM-co-DMAEMA)]. The copolymers were characterized by swelling measurements in distilled water (10-40 °C) and buffer solutions (I = 0.1 M, pH = 2.2-10.0), FTIR, DSC, and SEM methods. The ESV's of the NIPAM-DMAEMASA copolymers in distilled water were 5 times higher than those of P(NIPAM-co-DMAEMA); they decreased with an increase in comonomer (DMAEMASA/DMAEMA) content for both copolymers. While NIPAM-DMAEMASA copolymers did not display any phase transition with temperature, the LCST of the NIPAM-DMAEMA copolymer was determined as 20 °C. Both copolymers displayed a phase transition at pH = 5.0, but the pH of the phase transition for NIPAM-DMAEMA gels shifted to 7.0 with increased DMAEMA content. Glass transition temperatures of NIPAM copolymers did not change with the type and content of comonomer. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23692024 [article] Synthesis and characterization of novel poly (N - isopropylacrylamide - co - N,N' - dimethylaminoethyl methacrylate sulfate) hydrogels [texte imprimé] / Gulten Gurdag, Auteur ; Bestenur Kurtulus, Auteur . - 2011 . - pp. 12675-12684. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 24 (Décembre 2010) . - pp. 12675-12684 Mots-clés : Hydrogels Résumé : Poly(N-isopropylacrylamide-co-N,N'-dimethylaminoethyl methacrylate sulfate) [P(NIPAM-co-DMAEMASA)] was prepared from N-isopropylacrylamide (NIPAM) and N,N-dimethylaminoethyl methacrylate sulfate (DMAEMASA) monomers, and its properties were compared with those of poly(N-isopropylacrylamide-co-N,N'-dimethylaminoethyl methacrylate) [P(NIPAM-co-DMAEMA)]. The copolymers were characterized by swelling measurements in distilled water (10-40 °C) and buffer solutions (I = 0.1 M, pH = 2.2-10.0), FTIR, DSC, and SEM methods. The ESV's of the NIPAM-DMAEMASA copolymers in distilled water were 5 times higher than those of P(NIPAM-co-DMAEMA); they decreased with an increase in comonomer (DMAEMASA/DMAEMA) content for both copolymers. While NIPAM-DMAEMASA copolymers did not display any phase transition with temperature, the LCST of the NIPAM-DMAEMA copolymer was determined as 20 °C. Both copolymers displayed a phase transition at pH = 5.0, but the pH of the phase transition for NIPAM-DMAEMA gels shifted to 7.0 with increased DMAEMA content. Glass transition temperatures of NIPAM copolymers did not change with the type and content of comonomer. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23692024