ISSN:
1435-1528
Keywords:
Yield stress
;
ultrafine SiO2
;
master curve
;
master-master curve
;
critical surface tension
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
Abstract The yield stress of polymethylmethacrylate (PMMA) composites filled with ultrafine SiO2 particles was measured as a function of the draw temperature, rate of strain and filler content. The yield stress of the composites increased with increasing filler content and decreasing filler size. The tensile yield stress was found to be reducible with regard to draw temperature, rate of strain and filler content. At a given filler content, a master curve was obtained for the yield stress plotted versus the logarithm of the strain rate. The Arrhenius plot of the shift factors (a T ) used to produce the strain rate-temperature master curve formed a single curve for all sizes and loadings of the filler. The master curves obtained for different loadings of a filler of given size could be further reduced into a master-master curve by shifting them along the axis of strain rate, with the logarithm of the second shift factors (loga c ) proportional to the 4/5th power of the filler volume fraction (V f ). The proportionality constant and the exponent represent the extent of the filler reinforcing effect in the polymer. These values were found to be correlated with the critical surface tension of the polymers.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01329191
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