Graft copolymerization of N-vinyl-2-pyrrolidone onto sodium carboxymethylcellulose with azobisisobutyronitrile as the initiator
Yükleniyor...
Tarih
2007
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
John Wiley & Sons Inc
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Graft copolymers of sodium carboxymethylcellulose with N-vinyl-2-pyrrolidone were prepared in aqueous solutions with azobisisobutyronitrile as the initiator. The graft copolymers [sodium carboxymethylcellulose-g-poly(N-vinyl-2-pyrrolidone)] were characterized with Fourier transform infrared spectroscopy, elemental analysis, nuclear magnetic resonance spectroscopy, differential scanning calorimetry, and scanning electron microscopy. The grafting parameters, including the graft yield of the graft copolymer and the grafting efficiency of the reaction, were evaluated comparatively. The effects of reaction variables such as the time, temperature, and monomer and initiator concentrations on these parameters were studied. The graft yield and grafting efficiency increased and then decreased with increasing concentrations of N-vinyl-2-pyrrolidone and azobisisobutyronitrile and increasing polymerization temperatures. The optimum temperature and polymerization time were 70 degrees C and 4.30 h, respectively. Further changes in the properties of grafted sodium carboxymethylcellulose, such as the intrinsic viscosity, were determined. The overall activation energy for the grafting was also calculated to be 10.5 kcal/mol. (c) 2007 Wiley Periodicals, Inc.
Açıklama
Anahtar Kelimeler
graft copolymers, hydrophilic polymers, radical polymerization, copolymerization
Kaynak
Journal Of Applied Polymer Science
WoS Q Değeri
Q3
Scopus Q Değeri
Q2
Cilt
104
Sayı
2
Künye
closedAccess
