Anomalous behavior, polymer systems

The present study investigates the adsorption and trapping of polymer molecules in flow experiments through unconsolidated oil field sands. Static tests on both oil sand and Ottawa sand indicates that mineralogy plays a major role in the observed behavior. Effect of a surfactant slug on polymer-rock interaction is also reported. Corroborative studies have also been conducted to study the anomalous pressure behavior and high tertiary oil recovery in surfactant dilute-polymer systems(ll,12). 

R. Johnston Chain transfer to a mixture of agents The anomalous behavior of the acrylonitrile-dimethylformamide-water system. J. Polymer Sci. 39, 81-86 (1959). 

This paper, the third in a rheotechnics series, reports on rheological studies performed at y higher than 10 1 sec-1. In two-phase polymer systems, Rosen and Rodriquez (3) hypothesized anomalous behavior (yield shear stress) at y = 10 1. Recently, Zosel (9) verified this hypothesis experimentally for ABS systems. A study of the rheological behavior of ABS resins at very low y is now in progress at our laboratories. The correlation between rheological behavior and moldability will be discussed in detail in a subsequent paper. 

One of the most comprehensive comparisons of data for many filled polymer systems is given in the review by Holliday and Robinson (1973), which also provides additional expressions not discussed here. Several points are of special interest. First, equations such as Kerner s (1956a,h) and Wang and Kwei s (1969) agree reasonably well for spherical particles, while Turner s (1946) equation is better for systems in which fillers are fibrous or platelike. Second, fibers and fabrics induce the greatest deviation from additivity (see Figure 12.36). Finally, the behavior of polytetrafluoro-ethylene is strikingly anomalous. 

This behavior is probably related to the anomalous temperature dependence discussed in Section F2 of Chapter 11 and may be attributed to hyperentanglements with some kind of attraction between tactic regions in imperfectly atactic polymers. Such attractions can occur as evidenced by gel formation in solutions of mixed isotactic and syndiotactic poly(methyl methacrylate). " Similar effects might be expected in copolymer systems where hydrogen bonding can occur at widely separated points. ... 

A further, immediately obvious particularity of the present system is the anomalous swelling behavior of cellulose in water, as shown in Fig. 18. To the author s knowledge it is the only case where a high molecular weight polymer takes up more of the pure coexisting liquid than does a sample of lower molar mass. 

Papanicolaou, G. C., Kosmidou, T. V, Vatalis, A. S., Delides, C. G. (2006), Water absorption mechanism and some anomalous effects on the mechanical and visco-elastic behavior of an epoxy system, J. Appl. Polym. Sci., 99,1328-39. 

In the previous section the properties of nanopartides themsdves were considered such properties were demonstrated by various systems containing nanopartides [3-11]. This section is devot i to the description of the cooperative properties of nanosize particles in polymer matrix where the nature of a matrix is important. A number of anomalous properties exhibited by such composites consists of the interaction of small particles through the polymer matrix. In such processes the properties of the polymer matrix cannot be neglected and influence the cooperative behavior of the systems. 

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