Effects of an Ionomer Additive on the Rheological Properties of a RandomCopolymer Poly(Isobutyl Methacrylate-(Tert-Butylamino)ethyl Methacrylate)

摘要

The random copolymer poly(isobutyl methacrylate-(tert-butylamino)ethylmethacrylate) (poly(iBMA-tBAEMA)) is a useful polymer additive, which, for example, can be used in motor oils as a viscosity enhancer because of its ability to alter the rheological properties in a variety of organic solvents. A considerable body of patents concerning the preparation and the properties of this class of polymers has been reviewed. Our recent light scattering and viscosity studies of poly(iBMA-tBAEMA) in polar and nonpolar solvents at room temperature have revealed an aggregation phenomenon in most solvents spanning a large range of concentration from the dilute to the semidilute solution regimes. The coexistence of intra-and intermolecular interactions could most likely be attributed to the semidilute solution regimes. The coexistence of intra-and intermolecular interactions could most likely be attributed to the interactions between the basic amino groups on the side chains and the carboxylate groups.