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Crosslink density and solvent swelling of filled and unfilled stocks
Author(s) -
French David M.
Publication year - 1980
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1980.070250413
Subject(s) - swelling , solvent , materials science , composite material , plasticizer , filler (materials) , volume (thermodynamics) , volume fraction , modulus , polymer chemistry , mass fraction , chemistry , organic chemistry , physics , quantum mechanics
The network segment density (γ g ) by solvent‐swollen compression modulus of gum stocks and of stocks containing nonreinforcing fillers was calculated to be 6.6093 × 10 −9 h 0 Sf /ϕ B d 2 in mmole/m 3 of gel at 25°C, where h 0 is the height of the unswollen sample in cm, S is the slope of the height versus applied weight curve in g per mil (0.001 in.), ϕ B is the volume fraction of binder, d is the diameter of the initial sample in cm, and f is a factor equal to (1− ϕ s /ϕ B ) 1/3 /(1− ϕ S ) 2/3 , where ϕ S is the volume fraction of extract. The volume fraction of crosslinked polymer containing nonreinforcing fillers at equilibrium in a solvent ( V 2 ) was determined for the cases where the filler is insoluble and partially adheres to the binder, where the filler is partially solube and there is no binder–filler adhesion, and where the filler is completely soluble in the swelling solvent. The relations were tested and found to hold for polyester–polyurethane stocks containing plasticizer and soluble and insoluble fillers. Log V 2 fell on single straight‐line curves with respect to log γ g for gum stocks and filled stocks both when V 2 was measured in solvents which dissolved none or dissolved part of the fillers.