Graft Copolymerization of N-Vinylimidazole on Poly(Ethylene Terephthalate) Fibers in a Swelling Solvent Using Azobisisobutyronitrile as Initiator
In this study, poly(ethylene terephthalate) (PET) fibers were grafted in dimethylformamide (DMF) with n-vinylimidazole (n-VI) using azobisisobutyronitrile (AIBN) as an initiator. Variations of percentage grafting with time, temperature, monomer and initiator concentrations as well as monomer and initiator diffusions were investigated. It was observed that the percentage of grafting and grafting efficiency increased as time and temperature rose up to a certain value, and then they levelled off. The percentage of grafting was found to rise with increasing monomer and initiator concentrations, and then decrease. Monomer and initiator diffusions into PET fibers were shown to follow a similar trend and increased the percentage of grafting. Optimum conditions for grafting were found to be [n-VI] = 0.5 M, [AIBN] = 1.5 x 10-3 M, T = 70 °C and t = 3 days. The rate of grafting was found to be proportional to 1.4 and 0.7 powers of monomer and initiator concentrations, respectively. The overall activation energy for grafting was 22.2 kcal/mol. Further changes in the properties of grafted PET fibers such as intrinsic viscosity, water absorption capacity, fiber diameter and elongation percentage were determined. Grafted fibers were characterized by FTIR spectroscopy and scanning electron microscopy.
Anahtar Kelimeler:
Graft copolymerization, n-vinylimidazole, radical polymerization, swelling, PET fiber
Graft Copolymerization of N-Vinylimidazole on Poly(Ethylene Terephthalate) Fibers in a Swelling Solvent Using Azobisisobutyronitrile as Initiator
In this study, poly(ethylene terephthalate) (PET) fibers were grafted in dimethylformamide (DMF) with n-vinylimidazole (n-VI) using azobisisobutyronitrile (AIBN) as an initiator. Variations of percentage grafting with time, temperature, monomer and initiator concentrations as well as monomer and initiator diffusions were investigated. It was observed that the percentage of grafting and grafting efficiency increased as time and temperature rose up to a certain value, and then they levelled off. The percentage of grafting was found to rise with increasing monomer and initiator concentrations, and then decrease. Monomer and initiator diffusions into PET fibers were shown to follow a similar trend and increased the percentage of grafting. Optimum conditions for grafting were found to be [n-VI] = 0.5 M, [AIBN] = 1.5 x 10-3 M, T = 70 °C and t = 3 days. The rate of grafting was found to be proportional to 1.4 and 0.7 powers of monomer and initiator concentrations, respectively. The overall activation energy for grafting was 22.2 kcal/mol. Further changes in the properties of grafted PET fibers such as intrinsic viscosity, water absorption capacity, fiber diameter and elongation percentage were determined. Grafted fibers were characterized by FTIR spectroscopy and scanning electron microscopy.
- ISSN: 1300-0527
- Yayın Aralığı: Yılda 6 Sayı
- Yayıncı: TÜBİTAK
Sayıdaki Diğer Makaleler
Crystal Structure of cis-bis(N,N-dimethyl-N'-benzoylthioureato)palladium(II)
Alaa-Eldin Abdel Aziz SALEM, Mohamed Mohamed OMAR
Şerife TOKALIOĞLU, Şenol Kartal And Gökhan BİROL
Crystal structure of cis-bis (N,N-dimethyl_N'-benzoylthioureato) palladium (II)
Hakan ARSLAN, Hans-Jurgen HAUPT, Nevzat KÜLCÜ, Göktürk AVŞAR
Halil İbrahim ÜNAL, Can İNEGÖLLÜ, Oya ŞANLI
Halil İbrahim ÜNAL, Can İNEGÖLLÜ, Oya ŞANLI
Iridoid and Phenylpropanoid Glycosides from Phlomis samia, P. monocephala and P. carica
Funda Nuray YALÇIN, Tayfun ERSÖZ, Pınar AKBAY, İhsan ÇALIŞ
Production of an E. coli toxin protein; Colicin A in E. coli using and inducible system