Styrene-ethylacrylate copolymer

Figure 6.1 Viscosity versus shear stress for aqueous suspensions of charged poly(styrene-ethylacrylate) copolymer spheres of diameter d = 250 nm at various volume fractions 0 and T = 25°C. The NaOH concentration was varied with

Bashir MA, Radke W. Predicting the chromatographic retention of polymers application of the polymer model to poly(styrene/ethylacrylate)copolymers. J Chromatogr A 2012 1225 107-12. 

Eisenberg and coworkers have employed acid-base interactions to improve the miscibility of a number of polymer-polymer pairs. Miscible blends were prepared using acid-base interactions, e.g., with SPS (acid derivative) and poly (ethylacrylate-co-4-vinylpyrldine) (91), sulfonated polyisoprene and poly (styrene-co-4-vinylpyridine) (92), and using ion-dipole interactions, e.g., poly (styrene-co-llthium methacrylate) and poly (ethylene oxide) (93). Similarly, Weiss et al. (94) prepared miscible blends of SPS(acid) and amino-terminated poly (alkylene oxide). In addition to miscibility improvements, the interactions between two functionalized polymers offers the possibility for achieving unique molecular architecture with a polymer blend. Sen and Weiss describe the preparation of graft-copolymers by transition metal complexation of two functionalized polymers in another chapter. 

MBS with controlled size of the elastomeric particles transparent Copolymer of vinylchloride, alkyl acrylate, and vinyhdene chloride Butadiene-styrene-methylacrylate-ethylacrylate Core-shell crosslinked ABS with grafted onto it PMMA shell PB-grafted with MM A, styrene and vinyl acetate Poly(butadiene-co-butyl acrylate-co-styrene)... 

The polyacrylate used by Sim et al., (2011) is a thermoplastic acrylic copolymer synthesized (Gan, 2005) by free-radical polymerization of six monomer units added in semi batches to the reactor, as described in detail by Zhou et al., (2004). Schematic representation of the chemical stmcture of PAc showing part of the random distribution of the six monomer units viz. styrene, methyl methacrylate (MMA), butyl acrylate (BA), AA, 2-hydroxy ethylacrylate (2HEA), and isobutyl methacrylate (iBMA) in the backbone of the copolymer is shown in Figure 13 (Sim et al., 2009). The alphabets a-f denote mole fraction of 0.16, 0.17,0.39,0.19,0.06, and 0.03, respectively of each monomer unit in the copolymer. Figure 14 displays the difference in the results between a miscible and an immiscible blend systems. 

Commercial impact-modified acrylic resins (Table 19.15) exhibit five- to tenfold improvement in the notched Izod impact strength and the ultimate tensile elongation compared to the neat PMMA resin. These impact-modified acrylics are usually blended captively by the manufacturers of the acrylic resins. The base resin in a typical weatherable grade (Plexiglas DR, Rohm and Haas) could be a methyl methacrylate copolymer with ethylacrylate and styrene, while the rubber additive (ca. 10 %) could be an emulsion-polymerized, PMMA-grafted, cross-linked poly (n-butylacrylate) rubber of controlled particle size (<200 nm). The nonweatherable impact-modified acrylic (XT, CYRO) typically consists of a MMA/S/AN copolymer with MBS (ca. 10 %) rubber particle dispersions. 

In addition, it has been shown that hy introducing groups capable of ion-ion, ion-dipole, and dipole-dipole interactions, it is possible to achieve miscibility between otherwise immiscible polymer pairs. For example, although polystjrrene and poly(ethyl acrylate) are immiscible polymers, miscibility can be achieved by introducing styrene sulphonic acid units in the PS chains and ethylacrylate can be copolymerized with small quantities of 4-vinyl pyridine (19). This system is now one-phase through the effect of coulombic attractions between the two copolymers (20-22). 

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