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Nono Darsono, Hiroshi Mizunuma, Hiromichi Obara
Rheological study of the solidification of photopolymer and dispersed nanotube systems
Appl. Rheol. 21:6 (2011) 63566 (15 pages)
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We herein describe a set of rheological measurements that were carried out in order to characterize the solidification
of photopolymers. The solidification depends on the length of time of exposure to UV light, and the
intensity of that light, which reduces with distance from the irradiative surface. Liquid prepolymer was solidified
inside the gap of a parallel disk rheometer by irradiation of the prepolymer with UV light through a fixed
quartz disk. The rheological time-dependent changes were measured and analyzed for both unidirectional and
oscillatory shear. The results were compared with those obtained by direct measurement in the absence of shear.
When the thickness of the sample was less than 0.1 mm, the analysis for unidirectional shear flow yielded a reasonable
agreement for both critical exposure and solidified depth. When the thickness was greater than 0.1 mm,
the application of unidirectional shear delayed the start of the solidification but then caused it to occur more
rapidly. This dependence of the solidification on the thickness of the sample was more significant for dispersed
systems of nanotubes and for dynamic measurements made under oscillatory shear. The increase in viscosity
due to photopolymerization was also estimated, and its effect was discussed.
► Cite this publication as follows:
Darsono N, Mizunuma H, Obara H: Rheological study of the solidification of photopolymer and dispersed nanotube systems, Appl. Rheol. 21 (2011) 63566.
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