PNIPAM-based graft copolymers prepared using potassium persulfate as free-radical initiator: synthesis reproducibility
| Autor: | Bruna Luiza Batista de Lima, Nívia do Nascimento Marques, Bruna V. Lima, Ana M. S. Maia, Rosangela de Carvalho Balaban, Valdelice R. Silveira |
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| Rok vydání: | 2016 |
| Předmět: |
chemistry.chemical_classification
Materials science Polymers and Plastics Chemical modification 02 engineering and technology Potassium persulfate Polymer 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Thermogravimetry chemistry.chemical_compound Colloid and Surface Chemistry Chemical engineering chemistry Rheology Polymer chemistry Materials Chemistry Copolymer Radical initiator Thermal stability Physical and Theoretical Chemistry 0210 nano-technology |
| Zdroj: | Colloid and Polymer Science. 294:981-991 |
| ISSN: | 1435-1536 0303-402X |
| DOI: | 10.1007/s00396-016-3854-2 |
| Popis: | The use of free radicals has been considered an easy way to get grafted polymers. However, its reproducibility has not yet been evaluated. In this paper, the synthesis reproducibility of copolymers obtained by combining carboxymethylcellulose with N-isopropylacrylamide, in a free-radical copolymerization with potassium persulfate, was investigated. Poly(N-isopropylacrylamide) (PNIPAM) homopolymer and a PNIPAM/CMC blend were also prepared, in order to confirm the success of the synthesis. The polymers were characterized by infrared spectroscopy, thermogravimetry, and rheology. Copolymers and PNIPAM/CMC spectra exhibited characteristic absorptions of the precursor polymers. TGA analyses showed that the copolymers had better thermal stability than CMC and blend. The rheological studies demonstrated that the copolymers exhibited, at low temperatures, an improved thermosensitive performance, higher viscosity, and greater shear thinning behavior, in comparison with PNIPAM and PNIPAM/CMC. The copolymers solutions also exhibited greater thermal stability with increasing temperature. The spectroscopic and rheological properties confirmed the reproducibility of the chemical modification. |
| Databáze: | OpenAIRE |
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