Graft Copolymerization of N-Vinylimidazole on Poly(Ethylene Terephthalate) Fibers in a Swelling Solvent Using Azobisisobutyronitrile as Initiator

Halil İbrahim ÜNAL; Can İNEGÖLLÜ; Oya ŞANLI

Article Details

Graft Copolymerization of N-Vinylimidazole on Poly(Ethylene Terephthalate) Fibers in a Swelling Solvent Using Azobisisobutyronitrile as Initiator

Authors:

Halil İbrahim ÜNAL | Can İNEGÖLLÜ | Oya ŞANLI

Publisher:

TUBITAK

Journal:

Turkish Journal of Chemistry 2003 Vol.27 Issue 3, pp.403-415

Document Type:

Article

Publication Date:

2/2003

Document Language:

Turkish

Document ID (Org No.):

2000729602

Frequency:

Bimonthly

eISSN:

1303-6130

pISSN:

1300-0527

Abstract:

 

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.

 

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.

Article Details

Graft Copolymerization of N-Vinylimidazole on Poly(Ethylene Terephthalate) Fibers in a Swelling Solvent Using Azobisisobutyronitrile as Initiator

Authors: Halil İbrahim ÜNAL | Can İNEGÖLLÜ | Oya ŞANLI

Publisher: TUBITAK

Journal: Turkish Journal of Chemistry 2003 Vol.27 Issue 3, pp.403-415

Document Type: Article

Publication Date: 2/2003

Document Language: Turkish

Document ID (Org No.): 2000729602

Frequency: Bimonthly

eISSN: 1303-6130

pISSN: 1300-0527

Issues

Authors:

Halil İbrahim ÜNAL | Can İNEGÖLLÜ | Oya ŞANLI

Publisher:

TUBITAK

Journal:

Turkish Journal of Chemistry 2003 Vol.27 Issue 3, pp.403-415

Document Type:

Article

Publication Date:

2/2003

Document Language:

Turkish

Document ID (Org No.):

2000729602

Frequency:

Bimonthly

eISSN:

1303-6130

pISSN:

1300-0527