The analysis of poly(2,6-dimethyl-1,4-phenylene oxide) (PPO® resin) in mixtures of PPO resin,polystyrene, and copolymers of PPO resin and polystyrene

A method of determining the quantity of ungrafted poly(2,6-dimethyl-1,4-phenylene oxide) (PPO®

1 Trademark of General Electric Company.

resin) in mixtures of such polyphenylene oxide or PPO resin, polystyrene (PS), and graft copolymers of PPO resin and PS is described. The technique is a combination of physical and chemical separations and gel permeation chromatographic (GPC) analysis. The extent of grafting on PPO resin and the quantity of ungrafted PPO resin were calculated from molecular weight data and compositional analysis.