The effects of solvent type and aging on structural development in poly(vinyl chloride) thermoreversible gels |
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| Authors: | Minkyu Hwang Hoichang Yang Sanghyun Park Dae Ho Lee Kilwon Cho |
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| Institution: | 1. Department of Chemical Engineering/Polymer Research Institute, Pohang University of Science and Technology, Pohang 790‐784, Korea;2. Rensselaer Nanotechnology Center, Rensselaer Polytechnic Institute, Troy, New York 12180 |
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| Abstract: | We investigated the effects of solvent type (mono‐ester vs. di‐ester solvent) and aging on the structural development in the poly(vinyl chloride)/butyl benzoate (PVC/BB) and PVC/dibutyl phthalate(DBP) gels, as well as on their viscoelastic and mechanical behaviors. It was found that aged PVC/DBP gels held at RT for 7 days exhibit an improvement of about 100% in storage modulus (G′) compared to fresh gels, with a sudden drop in G′ around 50 °C, whereas the storage moduli of the PVC/BB gels decrease monotonically with temperature, irrespective of the postaging time. These different behaviors of the PVC/BB and PVC/DBP gels arise mainly because of the difference in the network structure produced by the formation of the polymer‐solvent complex between the C?O groups of the solvent and the polarized hydrogen moieties of PVC, as was confirmed with small angle X‐ray scattering and uniaxial tensile experiments. © 2007 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 46: 263–271, 2008 |
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| Keywords: | aging gel network gels polyvinyl chloride SAXS thermoreversible |
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