Styrene-co-methyl methacrylate

Example An unspecified copolymer of styrene and methyl methacrylate is named poly[styrene-co-(methyl methacrylate)]. 

Copolymers are composed of two or more monomers. Source-based names are conveniently employed to describe copolymers using an appropriate term between the names of the monomers. Any of half a dozen or so connecting terms may be used depending on what is known about the structure of the copolymer. When no information is known or intended to be conveyed, the connective term co is employed in the general format poly(A-co-B), where A and B are the names of the two monomers. An unspecified copolymer of styrene and methyl methacrylate would be called poly[styrene-co-(methyl methacrylate)]. 

Porous silica is most widely used as adsorbent, but bonded phase materials with polar groups or crosslinked acrylonitrile39> have also been tested. Silica requires painstaking control of activity. In the separation of poly(styrene-co-methyl methacrylate) samples with dichloroethane—chloroform mixtures, clearer results were obtained with a silica column previously rinsed with methanol40. Continuously decreasing activity of silica columns was observed in the elution of poly(styrene-co-methyl acrylate) with CCU-methyl acetate mixtures38). 

Fig. 9. Copolymer separation. Gradient elution of the mixture of three poly(styrene-co-methyl methacrylate) samples on a silica column (250 x 6 mm d0 = 5nm dP = 9pm). Gradient 1,2-dichloroethane/tetrahydro-...

Fig. 10. Copolymer separation. Gradient elution of the mixture of seven poly(styrene-co-methyl methacrylate) samples on a silica column (150x4.6 mm d0 = 6 nm dP = 5 pm). Gradient iso-octane/(tetrahydrofuran +10% methanol), 10% B (0 min), 50% (8 min), 80% (10 min), 100% (11 min) flow rate 1 ml/min, reduced to 0.3 ml/min after 9.9 min. Methyl methacrylate content (wt %) indicated. Molar mass values 11.4 — 160 kg/mol 23.8 — 250 37.0 — 150 49.5 — 185 64.0 — 235 76.2 — 220 88.5 — 220. Column temperature 50 °C. (By courtesy of Elsevier Science Publ. [43])...

I. J. Synthesis and characterization of exfoliated poly(styrene-co-methyl methacrylate)/clay nanocomposites via emulsion polymerization with AMPS, Polymer (2003), 44(20), 6387-6395. 

The polymer microstructure based on triad intensities in pyrolysates has been evaluated for poly(styrene-co-butyl acrylate), poly(styrene-co-methyl methacrylate), poly(vinyl chloride-co-vinylidene chloride), poly(styrene-co-maleic anhydride), and for chlorinated polyethylene considered as a copolymer of polyethylene and vinyl chloride [30]. 

Table 6.2.6. Compounds identified in the pyrogram of poly(styrene-co-methyl methacrylate) 40% wt. styrene, = 100,000-150,000, as shown in Figure 6.2.6.

Huelck, V. Thomas, D.A. Sperling, L.H. Interpenetrating polymer networks of poly(ethyl acrylate) and poly(styrene-co-methyl methacrylate). I. Morphology via electron microscopy and II. Physical and mechanical behavior. Macromolecules 1972, 5 (4), 340-348. 

The nomenclature of random copolymers includes the names of the monomers separated by the interfix -co-. Thus (XXII) is named as poly(styrene-co-methyl methacrylate) or poly(methyl methacrylate-co-styrene), depending on which of the monomers is the major component (if there is one). For alternating copolymers, the interfix -alt- is used, e.g., poly(styrene-a/r-maleic anhydride) (XXIII)... 

Optical densities at 269.5 nm for polystyrene solutions at concentrations of 0-1 X 10"2 mole/liter and for poly(styrene-co-methyl methacrylate) solutions at a total concentration of 1 X 10 2 mole/liter are presented in Figure 1 as functions of styrene content. The solvents were (from the top) dioxane, chloroform, tetrahydrofuran (THF), tetrachloroethane (TCE), and dichloro-ethane (DCE). It is evident that the linear relationship between optical density and styrene concentration that is valid for a polystyrene at all concentrations (open circles) does not hold for the statistical copolymers (solid circles). For example, copolymer (25-80 mole % styrene) solutions in chloroform deviate markedly from linearity the maximum per cent decrease in extinction coefficient (hypochromism) corresponds to a copolymer containing 50 mole % styrene. We define hypochromism as the decrease in absorption intensity at 269.5 nm per chromophore of the statistical copolymer relative to that of the atactic polystyrene. It is also evident from Figure 1 that the alternating copolymer also gives a sharp hypochromism whereas block copolymers and mechanical mixtures of polystyrene and poly (methyl methacrylate) do not deviate from the straight line. Similar results were obtained with the other solvents, but the composition range where hypochromism appears depends on the solvent used. 

PPE, HIPS, an ethylene-methacrylic acid copolymer, EMAA, SEES and SGMA PPE with PVDF, SEES, and poly (styrene-co-methyl-methacrylate)... 

IPN crosslinked PBA, crosslinked uncrosslinked SAN Poly(p-hydroxy styrene), PVPh and EVAl Acrylic core-shell copolymer and either PBT or PET Poly(allyl methacrylate-co-butyl acrylate-co-butanediol dimethacrylate-co-styrene-co-methyl methacrylate) or poly (aery lonitrile-co-butyl aery late-co-tricy clodeceny 1 aery late-co- styrene) Poly(acrylate-V-cyclohexyl maleimide), PMI, and a copolymer PMMA — core, crosslinked butyl acrylate-styrene copolymer — middle layer, and PMMA shell d = 200-300 nm PEG/atactic PMMA blends were characterized by PVT at T = 20-200°C and P = 0-200 MPa. Free volume fraction was calculated from an equation of state... 

Polymer (B) poly(styrene-co-methyl methacrylate) 2008SER... 

P.R. Kohl, A.M. Seifert, and G.P. Hellmann, Miscibility of poly(styrene-co-methyl methacrylate)s... 

The experimental results that will be examined consist of studies that look at the ability of a random copolymer to improve the properties of mixtures of the two homopolymers relative to the ability of a block copolymer. The three different systems that are examined include copolymers of poly(styrene-co-methyl methacrylate) (S/MMA), poly(styrene-co-2-vinyl pyridine) (S/2VP), and poly(styrene-co-ethylene) (S/E) in mixtures of the two homopolymers. The experiments that have been utilized to examine the ability of the copolymer to strengthen a polymer blend include the examination of the tensile properties of the compatibilized blend and the determination of the interfacial strength between the two homopolymers using asymmetric double cantilever beam (ADCB) experiments. 

Fig. 12. Separation of a mixture of seven statistical poly(styrene-co-methyl methacrylate)s by gradient HPLC stationary phase silica gel mobile phase iso-octane-(THF + 10% MeOH samples mass % of MMA indicated. (From [35] with permission)...

Copolymers of styrene and methyl methacrylate were separated by composition in numerous eluents. Most of them represented proper normal-phase systems with gradients increasing in polarity and a polar stationary phase. Figure 12 shows the separation of the mixture of seven statistical poly(styrene-co-methyl methacrylate)s on a silica column through a gradient i-octane/ (THF + 10% methanol) [35]. 

Since, at the critical point of a certain polymer, this polymer is always eluted at the same retention time (corresponding to = IX fiU different types of polymer blends containing this polymer as one component may be separated. This is demonstrated in Fig. 26 for PMMA- containing blends. Even chemically very similar blend components, such as poly(cyclohexyl methacrylate) (CHMA) and PMMA were separated. In addition, not only blends of homopolymers, but also blends of copolymers and PMMA may be investigated. Like the homopolymers, poly(styrene-co-acrylonitrile) and poly(styrene-co-methyl methacrylate) (CoStMMA) were eluted in the SEC mode. 

Figure 6-20. Dependence of the (03)e values on the average mass fraction wmma of the methylmethacrylate monomeric units in poly(styrene-co-methyl methacrylates). Solvent methyl-isopropyl ketone precipitant n-hexane temperature 25 C (after H.-G. Elias and U. Gruber).

Poly (styrene-co-acrylonitrile). See Styrene/acrylonitrile copolymer Poly (styrene-co-allyl alcohol). See Styrene/allyl alcohol copolymer Poly (styrene-co-butadiene). See Styrene/butadiene polymer Poly (styrene-co-divinylbenzene). See Styrene/DVB copolymer Poly (styrene-co-maleic anhydride). See Styrene/MA copolymer Poly (styrene-co-methyl methacrylate). See Styrene/methyl methacrylate copolymer Poly (styrene-co-a-methylstyrene). See Styrene/a-methyl styrene resin Poly (styrene-divinylbenzene). See Styrene/DVB copolymer Polystyrene, expandable Synonyms EPS Expandable polystyrene Expanded polystyrene XPS Definition Amorphous PS beads contg. pentane as a blowing agent and coated with a lubricant the polymer is converted to foamed articles with a closed cell structure by applic. of steam Properties Beads (0.4-1.5 mm diam.)... 

In addition to forming polymers with molecules of their own kind, many monomers can form copolymers with other monomers. The scale of possibilities is thus widely extended. In free radical polymerization, for example, styrene is converted to poly(styrene), methyl methacrylate to poly(methyl methacrylate), and vinyl acetate to poly(vinyl acetate). A mixture of styrene and methyl methacrylate gives poly(styrene-co-methyl methacrylate) even at the lowest conversions. From a mixture of styrene and vinyl acetate, on the other hand, practically pure poly(styrene) is first formed, and then, when the styrene is exhausted, almost pure poly(vinyl acetate). This is therefore a mixture (blend) and not a copolymer. Whereas stilbene, free-radically initiated, does not give a unipolymer, and maleic anhydride gives one of only low molecular weight, a mixture of both monomers leads to a copolymer of the composition 1 1. 

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