Benzoyl peroxide-induced graft polymerization of 2-methyl-5-vinylpyridine onto polyester/wool blend

Abstract

SynopsisGraft polymerization of 2-methyl-5-vinylpyridine (MVP) onto polyester/wool blended fabric was carried out using benzoyl peroxide as initiator. The graft polymerization reaction was conducted under a variety of conditions. The graft yield increased by increasing benzoyl peroxide concentration from 0.559 mmolefl. to 1.657 mmoieA. Further increase in benzoyl peroxide concentration (i.e., up to 2.795 mmolefl.) decreased grafting. Increasing the M W concentration from 4% to 10% caused a significant enhancement in grafting. The same held true for raising the polymerization temperature within the range of 65O-85OC. The grafting reaction proceeded initially at a fast rate and decreased with time to a slower rate. The grafted samples showed improved dyeability toward acid dye, increased density, and decreased moisture regain as compared with the untreated blend. Furthermore, a tentative mechanism for initiation of grafting was suggested.

Graft polymerization onto wool fibre for improved functionality

“…Pre-treated wool can swell which makes the inner functional groups available to the surface where the reaction is commenced. BPO alone was reported to be ineffective in initiating the graft polymerization reaction, and the presence of hydrogen ions was helpful for the initiation of the grafting (Abdel-Fattah, Shalaby et al 1977).…”

In Textiles

“…A new redox system -potassium monopersulfate/ Iron (II) -has been used for the grafting of acrylamide on wool in aqueous medium; a 40% grafting yield has been obtained by this method [37] . Graft polymerization of 2 -methyl 5 -vinyl pyridine onto polyester/wool (50:50) blended fabric has also been carried out using benzoyl peroxide as the initiator [46] . The grafted sample has shown improved dyeability toward acid dyes and decreased moisture regain.…”

Heat Induced Grafting of Poly(glycidyl methacrylate) on Polybutylene Terephthalate Nonwovens for Bioseparations

“…Heat induced vinyl polymerization is commonly used industrially to create bulk polymerizations in solution but has found limited application for surface modification of membranes . A few studies have been conducted investigating thermal grafting of vinyl monomers on polyethylene terephthalate (PET) and PP. − Arslan has successfully grafted polyGMA onto PET and then further functionalized the material for removal of chromium from aqueous solutions . Carroll et al grafted acrylic acid, 2-( N , N -dimethyl amino)­ethyl methacrylate, and poly­(ethylene glycol) monomethyl ether monoacrylate to PP to reduce membrane fouling by organic waste .…”

“…Bz 2 O 2 is a thermal initiator very similar in structure and function to the photoinitiator benzophenone used for photoinduced grafting of polyGMA onto PBT nonwovens. Additionally, Bz 2 O 2 has been shown to initiate heat grafting on polyester fabrics, ,, and the homolysis of Bz 2 O 2 at elevated temperatures has the potential to create radical polymerization sites on the PBT surface for polyGMA propagation. The epoxy end groups in polyGMA introduce chemical functionality to the PBT surface that enables the covalent attachment of amines, thiols, and hydroxyl groups. , Of course, the heat-induced-grafting method requires heating as well as solvents that could be problematic, but it does allow for grafting materials that are thicker and more complex as stated previously.…”