Graft Polymerization of Methacrylamide onto Poly(ethylene terephthalate) Fibers with Benzoyl Peroxide as Initiator and their Characterization

Abstract

Summary: The effects of polymerization temperature and time, initiator and monomer concentrations, ratio of water and solvent employed on the grafting of methacrylamide onto poly(ethylene terephthalate) fibers by the use of benzoyl peroxide initiator were studied. The graft yield was observed to increase with temperature and monomer concentration. The highest graft yield was obtained with an initiator concentration of 1 × 10−2 mol/L. The rate of grafting was proportional to the power 0.48 and 1.6 of the methacrylamide and benzoyl peroxide concentrations, respectively. The overall activation energy for grafting calculated was 42.8 kcal/mol. The thermogravimetric data revealed that the thermal stability of poly(ethylene terephthalate) fibers decreased with grafting.SEM micrographs of ungrafted PET fiber (a) and 44.9% MAAm‐grafted fiber (b).magnified imageSEM micrographs of ungrafted PET fiber (a) and 44.9% MAAm‐grafted fiber (b).

Preparation of methacrylamide grafted and dye‐ligand immobilized PET fibers: Studies of adsorption and purification of lysozyme

“…25 PET fibers prepared as bundles (0.3 6 0.001 g) were washed with distilled water and Soxhlet-extracted for 6 h with acetone and dried at ambient conditions before graft copolymerization. The fibers were transferred into the reaction chamber containing various amount of MAAm monomer.…”

“…In this study, metharylamide was grafted on the PET fibers, and a dye‐ligand was covalently immobilized on the amide groups of the grafted metharylamide brushes. The effects of reaction conditions on the graft polymerization, such as the initiator concentration, ratio of MAA to PET, temperature, and polymerization time were investigated and optimized in the previous study 25. Metharylamide grafted fibers were characterized by FTIR spectroscopy, scanning electron microscopy, and thermogravimetric analysis.…”

Study of crosslinking of polyphosphazene with allyl pendant groups initiated by benzoyl peroxide

“…In some studies about chemical grafting,22–24 this type of change trend was also reported. Based on their work, the results of our experiments could be explained by the following reasons: (1) the excessive BPO may act as a terminator of free radicals and decreases the rate of reaction; (2) during the course of crosslinking the flexibility of phosphazene chains decreased, which lowered the diffusion coefficient of BPO, especially for high concentration of BPO 11…”

Synthesis of Poly(o-toluidine) in DMF/Water Mixture Using Benzoyl Peroxide

“…[17,18] Therefore, Bz 2 O 2 dissolved in different organic solvents was added to the polymerization tube containing acidic water and monomer to start the polymerization, where the organic solvent=water mixture ratio was kept at a value of 20=80 (v=v). The data for the yield and conductivity of POT given in Table I were obtained.…”