Synthesis and characterization of the copolymer of dodecyl methacrylate/styrene containing an amidine functional group

Abstract

A copolymer of dodecyl methacrylate/styrene (DMA/St) containing the amidine functionality was synthesized and characterized. The one‐step solution copolymerization process was carried out using a mixed solvent, high temperature, and a functional azo initiator, 2,2′‐azobis[N,N′‐dimethylene isobutyramidine]. Copolymers with different compositions (DMA/St 10/1 to 1/2), molecular weight (Mn 2000–9000), and functionality (1.0–2.0) were prepared and characterized by NMR, FTIR, DSC, and elemental analysis. The molecular weight of the copolymers could be controlled by the amount of the initiators. Copolymer composition depends on the feed molar ratio of comonomers. The amidine functionality of the copolymers was determined by elemental analysis. It was found that 72% of the polymer chain has one functionality. The Tg of the copolymer depends on the feed molar ratio. This copolymer could be used as a potential dispersant for lubricant oil. Published 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 1684–1691, 2002

Synthesis and Characterization of Polyol Poly-12-Hydroxy Stearic Acid: Applications in Preparing Environmentally Friendly Overbased Calcium Oleate Detergent

“…Many studies of the polymeric hyperdispersants − and the overbased detergents − have been described previously. The conversions of THSA to PTHSA and PTHSA to polyol-PTHSA were all confirmed from the acid values of the reaction mixtures.…”

“…Polymeric hyperdispersants are specifically designed and synthesized polymeric additives. − In their structures, they can be simply described as having two key components: anchoring groups (such as −NH 2 , −COOH, −SO 3 H, and −OH, etc.) that adsorb onto the particle surface and polymeric chains that provide the steric stabilization barrier around the particles and prevent agglomeration.…”