Abstract
The network segment density (γg) by solvent-swollen compression modulus of gum stocks and of stocks containing nonreinforcing fillers was calculated to be 6.6093 × 10−9h0Sf/ϕBd2 in mmole/m3 of gel at 25°C, where h0 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.), ϕB is the volume fraction of binder, d is the diameter of the initial sample in cm, and f is a factor equal to (1− ϕs/ϕB)1/3/(1− ϕS)2/3, where ϕS is the volume fraction of extract. The volume fraction of crosslinked polymer containing nonreinforcing fillers at equilibrium in a solvent (V2) 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 V2 fell on single straight-line curves with respect to log γg for gum stocks and filled stocks both when V2 was measured in solvents which dissolved none or dissolved part of the fillers.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
