Influence of temperature, molecular weight, and molecular weight dispersity on the surface tension of PS, PP, and PE. I. Experimental

2001 ◽  
Vol 82 (8) ◽  
pp. 1907-1920 ◽  
Author(s):  
Jos� Carlos Moreira ◽  
Nicole Raymonde Demarquette
Keyword(s):  
Molecular Weight ◽  
Surface Tension ◽  
Influence Of Temperature

Influence of temperature, molecular weight, and molecular weight dispersity on the surface tension of polystyrene, polypropylene, and polyethylene. II. Theoretical

2002 ◽  
Vol 83 (10) ◽  
pp. 2201-2212 ◽  
Author(s):  
Nicole Raymonde Demarquette ◽  
Jos� Carlos Moreira ◽  
Renato Norio Shimizu ◽  
Mazen Samara ◽  
Musa R. Kamal
Keyword(s):  
Molecular Weight ◽  
Surface Tension ◽  
Influence Of Temperature

scholarly journals Average molecular weight of surfactants in aerosols

2007 ◽  
Vol 7 (5) ◽  
pp. 13805-13838 ◽  
Author(s):  
M. T. Latif ◽  
P. Brimblecombe
Keyword(s):  
Molecular Weight ◽  
Surface Tension ◽  
Atmospheric Aerosols ◽  
Average Molecular Weight ◽  
Molecular Size ◽  
Weight Fraction ◽  
Ozone Exposure ◽  
Before And After ◽  
Fine Mode ◽  
Active Substances

Abstract. Surfactants in atmospheric aerosols determined as methylene blue active substances (MBAS) and ethyl violet active substances (EVAS). The MBAS and EVAS concentrations can be correlated with surface tension as determined by pendant drop analysis. The effect of surface tension was more clearly indicated in fine mode aerosol extracts. The concentration of MBAS and EVAS was determined before and after ultrafiltration analysis using AMICON centrifuge tubes that define a 5000 Da (5 K Da) nominal molecular weight fraction. Overall, MBAS and to a greater extent EVAS predominates in fraction with molecular weight below 5 K Da. In case of aerosols collected in Malaysia the higher molecular fractions tended to be a more predominant. The MBAS and EVAS are correlated with yellow to brown colours in aerosol extracts. Further experiments showed possible sources of surfactants (e.g. petrol soot, diesel soot) in atmospheric aerosols to yield material having molecular size below 5 K Da except for humic acid. The concentration of surfactants from these sources increased after ozone exposure and for humic acids it also general included smaller molecular weight surfactants.

Surface Tension as a Function of Molecular Weight of Protonated Free and Conjugated Dihydroxy Bile Acids

1986 ◽  
Vol 71 (s15) ◽  
pp. 72P-72P
Author(s):  
C O Mills ◽  
G H Martin ◽  
E Elias
Keyword(s):  
Molecular Weight ◽  
Surface Tension ◽  
Bile Acids

The Surface Tension of Rubber Solutions

1931 ◽  
Vol 4 (3) ◽  
pp. 354-360
Author(s):  
G. W. Shacklock
Keyword(s):  
Molecular Structure ◽  
Molecular Weight ◽  
Surface Tension ◽  
Benzene Solution ◽  
Rubber Particle ◽  
Mechanical Action ◽  
The Past ◽  
Pure Product ◽  
Simple Molecules ◽  
Improved Methods

Abstract During the past few years much attention has been paid to the constitution of raw rubber. The much improved methods of production of plantation rubber have resulted in a reasonably pure product available for investigation, and chemical analysis undoubtedly shows an empirical formula of C5H8 for the hydrocarbon. From this point onward, knowledge becomes less certain. Osmotic pressure and molecular weight measurements give no confirmation of a simple molecular structure, but show, in benzene solution, a behavior comparable with that of colloids. This is supported by experiments on swelling and viscosity, and by ultramicroscopic examination, all of which lead to the conclusion that rubber is a lyophilic colloid. Hence arose the concept that the rubber particle is a polymer of simple molecules of formula C5H8 (possibly isoprene), such a structure being in agreement with the production of rubber-like substances by the action of sodium upon isoprene and butadiene (Harries, Annalen, 395, 211 (1912)). The decrease in viscosity of a rubber solution with increasing periods of mastication of the rubber is hence regarded as a measure of depolymerization due to mechanical action; the increased ease of solution after mastication is confirmatory evidence.

Molecular weight dependence and end-group effects on the surface tension of poly(dimethylsiloxane)

1993 ◽  
Vol 26 (12) ◽  
pp. 3069-3074 ◽  
Author(s):  
Claire Jalbert ◽  
Jeffrey T. Koberstein ◽  
Iskender Yilgor ◽  
Paula Gallagher ◽  
Val Krukonis
Keyword(s):  
Molecular Weight ◽  
Surface Tension ◽  
Molecular Weight Dependence ◽  
End Group ◽  
Group Effects
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