Styrene-co-methacrylic acid

This chapter discusses the dynamic mechanical properties of polystyrene, styrene copolymers, rubber-modified polystyrene and rubber-modified styrene copolymers. In polystyrene, the experimental relaxation spectrum and its probable molecular origins are reviewed further the effects on the relaxations caused by polymer structure (e.g. tacticity, molecular weight, substituents and crosslinking) and additives (e.g. plasticizers, antioxidants, UV stabilizers, flame retardants and colorants) are assessed. The main relaxation behaviour of styrene copolymers is presented and some of the effects of random copolymerization on secondary mechanical relaxation processes are illustrated on styrene-co-acrylonitrile and styrene-co-methacrylic acid. Finally, in rubber-modified polystyrene and styrene copolymers, it is shown how dynamic mechanical spectroscopy can help in the characterization of rubber phase morphology through the analysis of its main relaxation loss peak. 

Some of the effects of random copolymerization on secondary mechanical relaxation processes will be illustrated here on styrene-co-acrylonitrile (SAN) and on styrene-co-methacrylic acid (SMAA). 

T02 Torrens, F., Soria, V., Monzo, I.S., Abad, C., and Campos, A., Treatment of poly(styrene-co-methacrylic acid)/poly(4-vinylpyridine) blends in solution under liquid-liquid phase-separation conditions. A new method for phase-separation data attainment from viscosity measurements, J. Appl. Polym. Sci., 102, 5039, 2006. 

Compatibilized blends of ethylene-methacrylic acid copolymer and PS were prepared by Kim et al. (1998) through addition of S-co-4-vinylpyridine. Similarly, blends of poly(isobutyl methacrylate) were compatibilized with poly(styrene-co-methacrylic acid) using poly(isobutyl methacrylate-co-2-(A, A -dimethylamino) ethyl methacrylate) or poly(isobutyl methacrylate-co-4-vinylpyridine) (Habi and Djadoun 1999). Turcsayii (1995) has reported compatibilized blends of PE-g-(N-vinylimidazole) with acrylic acid-modified PP. 

PBT poly(styrene-co-methacrylic acid) blends TSE Impact modifier can be added Yang and McCready 1994... 

Styrene-co-methacrylic acid Ethyl methacrylate Single Tg fluorescence study Miscible when cast from toluene or dioxane immiscible when cast from chloroform I had 93.4-96.7 mol% styrene Chen and Morawetz (1989)... 

Journal of Applied Polymer Science 63, No.12, 21st March 1997, p.1543-55 MORPHOLOGY OF POLYISOPRENE-CO-STYRENE-CO-METHACRYLIC ACID LATEX PREPARED BY TWO-STAGE SEEDED EMULSION POLYMERISATION Karlsson O Hassander H Wesslen B Lund Institute of Technology... 

Chemically blended thermoplastic IPNs were made by Siegfried et Compositions included the use of SEES triblock copolymer as polymer I and poly(styrene-co-methacrylic acid) (10% MMA) as polymer II. These materials were made with a swelling process similar to that employed in the sequential IPNs. The carboxylic acid groups were neutralized with sodium hydroxide solutions while the materials were in a Brabender. Siegfried et al. also prepared the corresponding mechanically blended thermoplastic IPNs. 

This fundamental result certainly indicates the intermolecular nature of the energy barrier to deformation in glassy polymers. An additional experimental corroboration of this viewpoint was obtained in the study of a series of poly(styrene-co-methacrylic acid) (PS-co-MAA) polymers with regularly varied IMI (Sect. 4.4). 

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