| Summary: | 碩士 === 國立臺北科技大學 === 有機高分子研究所 === 97 === The polymer used in this study is PU-acrylate dendrimer with different numbers of functional groups synthesized from our laboratory. It contains two systems: IPDI and TDI system; with five, nine and thirteen functional groups respectively. A series of results were concluded after the polymer exposed to UV-light. The discussion is to explore the effects of UV-curing kinetic and conversion under various temperature (20.40.60.80℃) and different concentration of photo-initiator (DC-1773). The major continued test is done by DPA(Double Beam Photo-calorimetric Accessory). Through the results of tests, we discovered that the conversion, reaction rate and reaction order enhanced before the concentration of photo-initiator reach to a optimum level. After over the certain optimum concentration, the conversion, reaction rate and reaction order go down because numerous free radicals re-combine rapidly. However, the conversion, reaction rate and reaction order is enhanced when the reaction temperature increased. In the mechanical properties, PU-acrylate dendrimer with only five functional groups so that its hardness is not strong. Therefore, we incorporate PETA(Pentaeythritol triacrylate) to react with resin.With adding to 25wt% of PETA, its toughness increase substantially and its adhesion on the wood plate is better than aluminium plate obviously.
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