Polystyrene absorption behavior

Several investigations have determined tbe absorption behavior of surfactant adsorption on particles of aqueous polymer dispersions by adsorption titration. The results have been similar to those observed by Wolfram for adsorption on a planar polymer surface determined from the wettipg angle. Thus, Paxton (1969) established that the area occupied by a sodium dodecylbenzylsulfonate molecule in a saturated adsorption layer (ylsiim) the surface of PMMA latex particles is 1.31 nm, whereas on the surface of polystyrene latex particles it is only 0.53 nm. The author considers that previous studies of adsorption of this emulsifier, which gave adsorption area Msitm) were carried out on interfaces with similar adsotption... 

P. Saini, V. Choudhary, B. P. Singh, R. B. Mathur, S. K. Dhawan, Enhanced Microwave Absorption Behavior of Polyaniline-CNT/Polystyrene Blend in 12.4-18.0GHz Range. Synth. Met. 2011,161,1522-1526. 

Saini P, Choudhary V, Singh BP, Mathur RB, Dhawan SK. Enhanced microwave absorption behavior of polyaniline-CNT/polystyrene blend in 12.4-18.0GHz range. Synth Met 2011 161(15-16) 1522-6. 

The penetration of visible light through foamed polystyrene has been shown to foUow approximately the Beer-Lambert law of light absorption (22). This behavior presumably is characteristic of other ceUular polymers as weU. 

Figure 1 Transient absorption spectra obtained in the pulse radiolysis in 200 mM (base mM unit) polystyrene solutions in CH2CI2 at the pulse end ( ) and 100 nsec after the pulse (A). Inset time-dependent behavior observed at 1200 nm.

A good dispersion of rubber particles appears to favor the nucleation and growth of a large number of thick crazes uniformly distributed in the polystyrene matrix. This is believed to be an efficient source of energy absorption for the material under mechanical loading. The concepts of stress field overlap and critical volume of stress concentration zone for craze initiation were introduced to explain the observed mechanical behavior of HIPS. 

As microwave absorption is combined effect of dielectric and magnetic losses along with finite conductivity and matching thickness therefore, efforts have also been made to fine time these parameters. For example, Li and co-workers [153] synthesized polystyrene polypyrrole nickel (PSi PPy Ni) composite microspheres. These composites with ferromagnetic behavior display maximum R value of -20 dB at 10.69 GHz. 

The data in Table 3-23 indicate that no material lost more than about 5% in tensile strength in one year. Also, the three-month loss was comparable to the loss for the entire year. For example, the tensile strength of polystyrene had California values of 12,350 psi and 12,100 psi for 3 mo and 1 yr, respectively, while the initial strength was 13,600 psi. This behavior is attributed to initial water absorption and formulation of a partially degraded or photooxidized surface which acts as a barrier to prevent further degradation. These effects are quite rapid and would certainly be complete within 3 mo. if not within the first few weeks of exposure ... 

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