Comparison of model prediction with experiment for concentration-dependent modulus of poly(vinyl alcohol) (PVA) gels near the gelation point
✍ Scribed by Toshikazu Takigawa; Masaoki Takahashi; Kenji Urayama; Toshiro Masuda
- Publisher
- Elsevier Science
- Year
- 1992
- Tongue
- English
- Weight
- 368 KB
- Volume
- 195
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
The value of the critical exponent for modulus (t) was estimated by using a model based on the percolation theory, and the t value was experimentally determined for poly(viny1 alcohol) (PVA) gels. The model proposed in this study has shown that there is a critical strain (ye), which distinguishes two regimes in the elastic response of the gel network near the gelation point. The theory has also shown that ye is intinitesimally small for a realistic gelation in the 3D space. The exponent t for y> yc scales as d,,,,. de )u z 2.27 with fractal dimensions, dmin and dB, and the exponent v for correlation length for gels near the gelation point. The value oft for PVA gels has been found to be 2.3 1 f 0.04 and is close to the one predicted by the model proposed.