Grafting onto polypropylene. I. Effect of solvents in gamma radiation‐induced graft copolymerization of poly(acrylonitrile)

Abstract

Graft copolymerization of acrylonitrile (AN) onto isotactic polypropylene (PP) fiber has been studied by using gamma rays from a 2100 Ci 60Co source as initiator by preirradiation technique. The preirradiated PP was treated with AN and the mixture was graft copolymerized by heating to 100°C for different time periods. The percentage of grafting is determined as a function of total dose, reaction time, and monomer concentration. The effect of different solvents such as H2O, CH3OH, and dioxane upon percentage of grafting has been studied. The maximum effect was observed in water and the minimum in CH3OH. PP—g—PAN was characterized by IR spectroscopic and thermogravimetric methods. A plausible mechanism of gamma radiation induced grafting of AN onto PP in the absence and in the presence of solvents has been proposed. An attempt has been made to compare the relative abilities of different solvents to influence grafting.

Surface treatments of subdenier monofilament polypropylene fibers to optimize their reinforcing efficiency in cementitious composites

“…Graft copolymerization of hydrophilic monomer onto subdenier monofilament PP fiber by using gamma rays from a 60 Co source as initiator by a preirradiation technique was previously reported 7–9. In the present investigation, the hydrophilic monomer used was acrylic acid.…”

Reactions of polystyryl anions with poly(chlorotrifluoroethylene) film at the solution-solid interface

“…Reaction is faster at higher temperatures and higher concentrations. The product film samples varied in color, depending on the extent of reaction, Figure 13. ATR IR spectra of PCTFE film samples that had been reacted with PS-S-Li In = 50) in THF with the following conditions: a, room temperature, 0.04 M, 37 min; b, refluxing THF, 0.2 M, 3 h. over a spectrum ranging from clear to "tinted" (brown) to metallic copper-colored.…”

Radiation-induced grafting of N-isopropylacrylamide onto the brominated poly(2,6-dimethyl-1,4-phenylene oxide) membranes

“…This may the reason why the lower grafting degree is observed in those different kinds of alcohols. In the aqueous medium system, on the other hand, since water has zero chain transfer constant (Misra et al, 1985), the reaction 7 is not likely to occur in the grafting system. Therefore, the side reaction involving chain transfer is minimal in water.…”