Polystyrene solvents

The existence of a true graft copolymer was concluded from the weight increase not extractable by polystyrene solvents and by the eventual leveling off of the weight increase while homopolymerization continued. Moreover, the graft of cellulose acetate and styrene after dissolution and precipitation with various solvents and precipitants still showed the infrared absorption of both substituents. In addition to this, the results fitted well with the kinetic theoiy of grafting proved on other systems. 

Schuster, R. H. Grater, H. Cantow, H.-J., "Thermodynamic Studies on Polystyrene-Solvent Systems by Gas Chromatography," Macromolecules, 17, 619 (1984). 

Fig. 2 Column Micropak AA (sulfonated polystyrene) solvent A 02M sodium citrate, pH 3.25 solvent B IM sodium citrate, pH 7.40. Gradient 5 min 100% A 100-75% A in 20 min 75-70% A in 5 min 70-35% A in 5 min 10 min 35% 35-0% A in 1 min. T = 50°C for 25 min, then 90°C. Detection after ninhydrin postcolumn reaction. (Reprinted from Amino acid analysis with ninhydrin postcolumn derivatization, LC at Work, Varian Associates with permission.)...

PHASE DIAGRAMS AND THERMODYNAMICS OF DEMIXING OF POLYSTYRENE/ SOLVENT SOLUTIONS EV (T,P,X) SPACE... 

Horita, K., Abe, R, Einaga, Y., and Yamakawa, H., Excluded volume effects on the intrinsic viscosity of oligostyrene and polystyrenes-solvent effects. Macromolecules, 26, 5067-5072 (1993). 

Xylenol 2,6-Xylenol polysiloxane resin improver Benzene phosphinic acid polystyrene derivative mfg, crosslinked Styrene/DVB copolymer polystyrene/polyamide/PC blends Polyphenylene ether polystyrenes Solvent yellow 33... 

For the polystyrene/solvent systems listed (Caneba, 1992a, b), careful selection of the solvent(s) permitted the FRRPP process to be carried out at a relatively low temperature, which made this new polymerization method more promising. For high LCST systems, specially designed reactors can be used to carry out the FRRPP process. However the limitation is, the higher the temperature, the more likely the incipience of thermal degradation in the system. Additionally, running the free-radical... 

SC2 Schuster, R.H., Grater, H., and Cantow, H.J., Thermodynamic studies on polystyrene-solvent systems by gas chromatography, Macro/wo/ecw/es, 17, 619, 1984. 

For radical grafted polystyrene (solvent toluene) the ratio Fq/Fl is dependent on the molecular weight, and lies between 0.150 and 0.035. For anionically grafted polystyrene (solvent THF), these values decrease with increasing molecular weight from 0.330 to 0.022, see Table 2. Values of Fq/F smaller than one indicate a contraction of the coil on the surface, or a mutual penetration of the coils or an extension of the coil in the molecule axis perpendicular to the surface. It is therefore suggested that the structure of the grafted molecules is a deformed ellipsoid, partly contracted and partly interpenetrated with other random coils, see Fig. 4. 

Kobayashi, M., Yoshioka, T., Kozasa, T., Tashiro, K., Suzuki, J.-I., Funahashi, S., Izumi, Y. Structure of physical gels formed in syndiotactic polystyrene/solvent systems studied by smaU-angle neutron scattering. Macromolecules, 27,1349-1354 (1994). 

Roels, T., Deberdt, E, Berghmans, H. Thermoreversible gelation in syndiotactic polystyrene solvent systems. Progr. Colloid Polym. Sci., 102,82-85 (1996). 

Van Hooy-Corstjens, C. S. J., Magusin, P. C. M., Rastogi, S., Lemstra, P. J. Comparative study on gels and clathrates of syndiotactic polystyrene Solvent mobility in polymer-solvent compounds. Macromolecules, 35, 6630-6637 (2002). 

---