Synthesis Of Functionalized Poly(ethylene Terephthalate) Fibers By Grafting Of Crotonic Acid/methacrylamide Monomer Mixture

摘要

Functionalized poly(ethylene terephthalate) (PET) fibers were synthesized with graft copo-lymerization of crotonic acid - methacrylamide (CrA-MAAm) comonomers by using ben-zoylperoxide as initiator onto PET fibers in an aqueous medium. The functionalized fibers were characterized by Fourier transform infrared spectroscopy, thermogravimetric analysis, differential scanning calorimeter, scanning electron microscopy, and X-ray diffractom-etry. The effects of reaction conditions, such as monomer mixture ratio, monomer mixture and initiator concentration, polymerization time, and temperature on grafting were investigated. In alone grafting of CrA, a graft yield as low as 2.2% was observed. However, the use of MAAm as a comonomer increased the amount of CrA inserted to the PET fiber up to 23.9%. An increase in the temperature between 65 ℃ and 95 ℃ and also, increase in monomer mixture concentration between 0.25 M and 1.00 M increased the grafting rate and saturation graft yield. The graft yield has shown an increase up to an initiator concentration of 1.0 × 10~(-2) M and decreased afterwards. The rate of grafting was found to be proportional of the 0.89 and 0.47 powers of CrA/MAAm and Bz_2O_2 concentrations, respectively. The grafting increased the crystallinity, dyeability with acidic and basic dyes, and water absorption capacity but decreased the thermal stability of the fibers.