Abstract
Photopolymerization of methyl methacrylate and methyl cinnamate was carried out using benzoin ethyl ether (BEE) to yield light-focussing plastic rods with parabolic gradient of refractive index in the region near center axis. The gradient constant (A), which was measured by light tracing method, increased with the increase of BEE concentration. To improve the mechanical strength plasticizer was added, but most of general plasticizers caused the reduction of A value. However, the plasticizer which has a photoinitiating property did not. The mechanical strength of the plastic rods observed by the tensile properties showed maximum of 2.0 kg/mm2 at 7% addition of such a plasticizer.
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