Polystyrene aggregation

Karthaus, O., Ijiro, K. and Shimomura, M. (1996) Ordered self-assembly of nanosize polystyrene aggregates on mica. Chem. Lett., 821-822. 

W.C. Tang, Y.Lo, A. Nadeem Mechanical an drying shrinkage properties of structural-graded polystyrene aggregate concrete. Cement Concrete Composites 30, (2008), p.403-409. 

D. Saradhi Babu, K. Ganesh Babu, T.H. Wee Properties of lightweight expanded polystyrene aggregate concretes containing fly ash. Cement and Concrete Research 35, (2005), p. 1218-... 

Expanded polystyrene-aggregated concrete wall in steel 1 frame 100 0.75... 

Aksenov, A.A. and Bier, M.E. (2008) The analysis of polystyrene and polystyrene aggregates into the mega Dalton mass range by cryodetection MALDl TOE MS./. Am. Soc. Mass Spectrom., 19, 219-230. 

The enzymatic activity of the HRP-polystyrene aggregate was tested at 22 °C and the enzyme-polymer hybrid retained activity. After five days, the aggregates displayed a TOF of 360 h in phosphate buffer at pH 7.5, which is however two orders of magnitude lower than the native enzyme. 

The valuable characteristics of polyblends, two-phase mixtures of polymers in different states of aggregation, were also discussed in the previous chapter. This technique has been widely used to improve the toughness of rigid amorphous polymers such as PVC, polystyrene, and styrene-acrylonitrile copolymers. 

The kinetics of polymerization and conductometric studies of barium polystyrene with one active end-group per chain were reported by De Groof et al. 79,80). Formation of an unconventional anionic species, Ba2 +, (CH(Ph)CH2—)j, had to be postulated to account for the results. The existence of such a species is supported by the recent study of the kinetics of polymerization of lithium polystyrene performed in the presence of barium polystyrene endowed with two active endgroups 78). The polymerization of the lithium salt is retarded by the presence of the barium salt, and the retardation is accounted for by the formation of the inert aggregated anions,... 

Li C., Register R.A., and Cooper S.L., Direct observation of ionic aggregates in sulfonated polystyrene ionomers, Polymer, 30, 1227, 1989. 

Figure 6.5. Experiments involving mimics of sporopollenin (the principal component of spore walls] demonstrate that patterns very similar, if not identical to those of natural spores and pollen, can be produced from mixtures containing colloidal particles. All scales refer to bar in (a. (a Spore-like structures of polystyrene particles and particle aggregates formed around a droplet of hydrocarbon. Scale = 10 p.m. (b A broken structure like that shown in (a. Scale =...

Shuto, K., Oishi, Y, Kajiyama, T. and Han, C. C. (1993) Aggregation structure of a two-dimensional ultrathin polystyrene film prepared by the water casting method. Macromolecules, 26, 6589-6594. 

A theoretical prediction of water-soluble polymer solutions is difficult to obtain due to their ability to build up aggregations and associations. A prediction of the viscosity yield is much easier to observe for solutions of synthetic polystyrene due to its simple solution structure. These solutions have been well characterized in other studies [19-23] concerning their chemical composition, molar mass and sample polydispersity. 

Fig. 31. Fractal structures obtained experimentally at different stages of aggregation of a colloidal monolayer of 1 /im sulfonated polystyrene particles on the surface of an aqueous calcium chloride solution, initially uniformly distributed (Robinson and Earnshaw, 1992).

Rupture of fractal (flocculated) aggregates of polystyrene latices in simple shear flow and converging flow was studied by Sonntag and Russel (1986, 1987b). For simple shear flow and low electrolyte concentrations, the critical fragmentation number decreases sharply with agglomerate radius (R) as... 

Two fractions of atactic polystyrene dendrimer derived from monomer 12(G-2) were investigated by GPC and LS under conditions where no aggregation occurs. Whereas GPC gave Mw=82,000 and Mw= 600,000, LS furnished... 

Zhang L, Eisenberg A (1995) Multiple morphologies of crew-cut aggregates of polystyrene-6-poly(acrylic acid) block copolymers. Science 1268 1728-1731... 

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