Premium
Mercury Porosimetry Studies III: A Check on the Validity of the Critical pressure technique for porous powders
Author(s) -
Davidson John A.
Publication year - 1985
Publication title -
particle and particle systems characterization
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.877
H-Index - 56
eISSN - 1521-4117
pISSN - 0934-0866
DOI - 10.1002/ppsc.19850020111
Subject(s) - porosimetry , porosity , wetting , materials science , mercury (programming language) , mineralogy , composite material , porous medium , chemistry , computer science , programming language
Abstract In any determination of the internal porosity (intra particle porosity) by mercury porosimetry, the penetration curve must be interpreted in such a way that the contribution of the interparticle porosity is deleted. In an earlier communication an experimental technique, known as the critical pressure technique, was developed to accomplish this goal. In this communication a hot stage microscopy image analysis technique is described for the determination of the intra particle porosity of PVC resins. This enables the validity of the critical pressure method to be independently tested. On 12 samples of PVC resin a 1 – 1 correlation between the two methods was found indicating the validity of the critical pressure technique. Another porosity determination technique described earlier, based on the uptake of wetting oil, is also discussed in the light of these findings. This work also illustrates that hot stage microscopy, combined with image analysis, can be used to determine the glass transition of polymers on samples as small as 1·10 −8 grams.