A versatile characterization of poly(N-isopropylacrylamide-co-N,N'-methylene-bis-acrylamide) hydrogels for composition, mechanical strength, and rheology
Poly(N-isopropylacrylamide-co-N,N'-methylene-bisacrylamide) (P(NIPAAm-co-MBA)) hydrogels were prepared in water using redox initiator. The copolymer composition at high conversion (> 95%) was determined indirectly by HPLC (high performance liquid chromatography) analysis of the leaching...
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| Format: | Article |
| Language: | English |
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Budapest University of Technology and Economics
2013-01-01
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| Series: | eXPRESS Polymer Letters |
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| Online Access: | http://www.expresspolymlett.com/letolt.php?file=EPL-0003831&mi=cd |
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| author | J. Kovacs A. Chetty V. Vargha A. Meszaros J. Fekete A. Domjan A. Szilagyi Zs. Sulyok |
| author_facet | J. Kovacs A. Chetty V. Vargha A. Meszaros J. Fekete A. Domjan A. Szilagyi Zs. Sulyok |
| author_sort | J. Kovacs |
| collection | DOAJ |
| description | Poly(N-isopropylacrylamide-co-N,N'-methylene-bisacrylamide) (P(NIPAAm-co-MBA)) hydrogels were prepared in water using redox initiator. The copolymer composition at high conversion (> 95%) was determined indirectly by HPLC (high performance liquid chromatography) analysis of the leaching water and directly by solid state 13C CP MAS NMR (cross polarization magic angle spinning nuclear magnetic resonance) spectroscopy of the dried gels, and was found to be close to that of the feed. The effect of cross-linker (MBA) content in the copolymer was investigated in the concentration range of 1.1–9.1 mol% (R:90–10; R = mol NIPAAm/mol MBA) on the rheological behaviour and mechanical strength of the hydrogels. Both storage and loss modulus decreased with decreasing cross-linker content as revealed by dynamic rheometry. Gels R70 and R90 with very low cross-linker content (1.2–1.5 mol% MBA) have a very loose network structure, which is significantly different from those with higher cross-linker content manifesting in higher difference in storage modulus. The temperature dependence of the damping factor served the most accurate determination of the volume phase transition temperature, which was not affected by the cross-link density in the investigated range of MBA concentration. Gel R10 with highest cross-linker content (9.1 mol% MBA) behaves anomalously due to heterogeneity and the hindered conformation of the side chains of PNIPAAm. |
| format | Article |
| id | doaj-art-e84619ef4e1d43748824000ddc44a5de |
| institution | DOAJ |
| issn | 1788-618X |
| language | English |
| publishDate | 2013-01-01 |
| publisher | Budapest University of Technology and Economics |
| record_format | Article |
| series | eXPRESS Polymer Letters |
| spelling | doaj-art-e84619ef4e1d43748824000ddc44a5de2025-08-20T03:19:10ZengBudapest University of Technology and EconomicseXPRESS Polymer Letters1788-618X2013-01-01719510510.3144/expresspolymlett.2013.9A versatile characterization of poly(N-isopropylacrylamide-co-N,N'-methylene-bis-acrylamide) hydrogels for composition, mechanical strength, and rheologyJ. KovacsA. ChettyV. VarghaA. MeszarosJ. FeketeA. DomjanA. SzilagyiZs. SulyokPoly(N-isopropylacrylamide-co-N,N'-methylene-bisacrylamide) (P(NIPAAm-co-MBA)) hydrogels were prepared in water using redox initiator. The copolymer composition at high conversion (> 95%) was determined indirectly by HPLC (high performance liquid chromatography) analysis of the leaching water and directly by solid state 13C CP MAS NMR (cross polarization magic angle spinning nuclear magnetic resonance) spectroscopy of the dried gels, and was found to be close to that of the feed. The effect of cross-linker (MBA) content in the copolymer was investigated in the concentration range of 1.1–9.1 mol% (R:90–10; R = mol NIPAAm/mol MBA) on the rheological behaviour and mechanical strength of the hydrogels. Both storage and loss modulus decreased with decreasing cross-linker content as revealed by dynamic rheometry. Gels R70 and R90 with very low cross-linker content (1.2–1.5 mol% MBA) have a very loose network structure, which is significantly different from those with higher cross-linker content manifesting in higher difference in storage modulus. The temperature dependence of the damping factor served the most accurate determination of the volume phase transition temperature, which was not affected by the cross-link density in the investigated range of MBA concentration. Gel R10 with highest cross-linker content (9.1 mol% MBA) behaves anomalously due to heterogeneity and the hindered conformation of the side chains of PNIPAAm.http://www.expresspolymlett.com/letolt.php?file=EPL-0003831&mi=cdPolymer gelsPNIPAAmRheologyMechanical propertiesCopolymer composition |
| spellingShingle | J. Kovacs A. Chetty V. Vargha A. Meszaros J. Fekete A. Domjan A. Szilagyi Zs. Sulyok A versatile characterization of poly(N-isopropylacrylamide-co-N,N'-methylene-bis-acrylamide) hydrogels for composition, mechanical strength, and rheology eXPRESS Polymer Letters Polymer gels PNIPAAm Rheology Mechanical properties Copolymer composition |
| title | A versatile characterization of poly(N-isopropylacrylamide-co-N,N'-methylene-bis-acrylamide) hydrogels for composition, mechanical strength, and rheology |
| title_full | A versatile characterization of poly(N-isopropylacrylamide-co-N,N'-methylene-bis-acrylamide) hydrogels for composition, mechanical strength, and rheology |
| title_fullStr | A versatile characterization of poly(N-isopropylacrylamide-co-N,N'-methylene-bis-acrylamide) hydrogels for composition, mechanical strength, and rheology |
| title_full_unstemmed | A versatile characterization of poly(N-isopropylacrylamide-co-N,N'-methylene-bis-acrylamide) hydrogels for composition, mechanical strength, and rheology |
| title_short | A versatile characterization of poly(N-isopropylacrylamide-co-N,N'-methylene-bis-acrylamide) hydrogels for composition, mechanical strength, and rheology |
| title_sort | versatile characterization of poly n isopropylacrylamide co n n methylene bis acrylamide hydrogels for composition mechanical strength and rheology |
| topic | Polymer gels PNIPAAm Rheology Mechanical properties Copolymer composition |
| url | http://www.expresspolymlett.com/letolt.php?file=EPL-0003831&mi=cd |
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