Polystyrene/Styron

Styrene HzC CHCeHs Polystyrene, Styron Foam and molded articles... 

Dow became involved in making styrene and polystyrene in the mid-1930s. Two excellent historical accounts are available (1, 2). Styron 666 general purpose polystyrene was introduced in 1938, and the first impact polystyrene, Styron 475, was introduced in 1948. These early processes were batch, but a continuous process was introduced in 1952. World War II increased the availability of information concerning styrene and polystyrene because of the cooperative U.S. effort to make styrene butadiene rubbers (SBR)... 

Styron LR-175. See Polystyrene Styron XL-8023VC Styron XL-8028 Styron XL-8035 MFD. See Polystyrene, hIgh-Impact... 

Polystyrenes Styron (Dow Chemical) Lustrex (Monsanto) Dylene (Koppers) Rexolite (American Enka)... 

PS Polystyrene Atochem BASF BP Dow Lacqrenc Polystyrol BP Polystyrene Styron... 

SHELLAC COMPOUNDS ORGANIC POLYSULFIDES POLYSTYRENE (Styron)... 

The fourth and final article in this series [34] investigates the significance of MA as a copolymer with styrene as regards exfoliation of montmorillonite and mechanical performance. The control was the pure polystyrene, Styron 678 CW manufactured by Dow Chemical. SAN from the previous study was re-evaluated in the range of 2 to 31 wt.% of acrylonitrile content. The SMA copolymers that were evaluated had ... 

In a study by Bosak etaL the core polymer was polypropylene and the sheath material consisted of immiscible blends of two polymers. Polystyrene (Styron 484, designated as PS) and two polyamide-6 polymers (BS-400 and BS-700, designated as PA6) were used as the dispersed particles in the blend that was used as the sheath. Polyethylene (Affinity SM1300 PE) was used as the continuous phase in the sheath for all results reported here. We also conducted preliminary studies using PP as the matrix phase in the sheath. However, the PP matrix containing PS inclusions could not be spun into fibres at any of the drawing speeds, and could be spun at the lowest speed for the PA6 inclusions. Consequently, the researchers did not investigate PP further as the matrix material for blends used as the sheath. Rbres made of pure polypropylene were used as control specimens. 

Figure 6.6 Plots of relaxation time X versus the reciprocal of absolute temperature T for (O) LDPE (Rexene 111), (A) LDPE (PE 510), ( ) LDPE (NPE 962), (V) polypropylene (Profax 6423), and (O) polystyrene (Styron 678), where the values of X, appearing in Eq. (3.39), were determined by curve fitting the experimentally obtained log versus log y plot to the theoretical prediction of the Spriggs model, Eq. (3.38).

Let us observe further how polydispersity affects the steady-state shear flow properties of linear flexible homopolymers. Figure 6.32 gives log r] versus log y plots for two commereial polystyrenes (Styron 678 and Styron 685, Dow Chemical Company) at 200 and 220 °C. Note that Styron 678 has a lower molecular weight but broader... 

Impact polystyrene (IPS) is one of a class of materials that contains mbber grafted with polystyrene. This composition is usually produced by polymerizing styrene (by mass or solution free-radical polymerization) in the presence of a small amount (ca 5%) of dissolved elastomer. Some of the important producers of impact-resistant polystyrenes are BASE (Polystyrol), Dow (Styron), and Monsanto (Lustrex). The 1988 U.S. production of impact polystyrene was more than 1 million t (92). 

STYROFOAM , polystyrene insulation, 122 STYRON A-TECH , polystyrene resins, 122 Subtilisins, 122 Sucrose, 122... 

In this respect, additional results, as obtained on polymer melts 40), seem of interest. Fig. 1.9 shows results obtained on a polystyrene melt (Styron 666 at 190° with the aid of the discussed slit-apparatus. In this figure the total path difference is plotted in the form (P/d) against apparent shear rate Ds. Extrusion defect occurs only at the highest... 

Fig. 1.9. Total path difference P, divided by slit width d, as a function of apparent shear rate D, for a polystyrene melt (Styron 666) at 190° C [Wales (40)]...

Styron [Dow]. TM for polystyrene resins, general purpose, medium and high impact, heat and impact-heat resistant, and light-stabilized resins... 

Sulfonated Polystyrene (S-PS). The preparation of S-PS has been described in detail in Ref. 6. The following procedure was generally followed 104 g of PS (Styron 666 manufactured by Dow Chemical Company) were dissolved in 490 mL of 1,2-dichloroethane. The solution was heated to 50°C, and the requisite amount of acetyl sulfate was added, in this case, 30 mL of 0.996M acetyl sulfate (29.9 meq). The solution was stirred for 60 min at 50°C, and the reaction was terminated by the addition of 25 mL of methanol. Sufficient sodium hydroxide (diluted with methanol) was added to neutralize all acid present. The polymer solution was precipitated into a substantial excess of methanol with vigorous agitation, followed by filtration and washing with methanol. The product was then vacuum dried. Analyses were conducted for sulfur and sodium. The level of sulfonate incorporated was determined by sulfur analysis. 

Styron. [Dow Plastics] Polystyrene general-purpose, impact, and structural foam resins. 

Styrene CH2=CH 6 Polystyrene (PS) —(-CH,—CH 6" Transparent and brittle used for cheap molded objects, e.g., Styron, Carlnex, Hostyren, Lustrex. Modified with rubber to improve toughness, e.g.. High impact Polystyrene (HIPS) and acrylonitriie-butadiene-styrene copolymer (ABS). Expanded by volatilization of a blended blowing agent (e.g., pentane) to make polystyrene foam, e.g., Styrocell, Styrofoam. 

Styron 41 O, Styron 421, Styron 425, Styron 437, Styron 455C, Styron 469R, Styron 478 Styron 479, Styron 484, Styron 484C, Styron 489, Styron 498. See Polystyrene, high-impact Styron 613, Styron 615APR, Styron 623, Styron 666D, Styron 667 Styron 685 Styron 685D Styron 688 Styron 695 Styron 697. See Polystyrene... 

Styron 6061. See Polystyrene, high-impact Styron 6075 Styron 6087 SF Styron 6515 ... 

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