| Summary: | 碩士 === 國立臺北科技大學 === 化學工程系碩士班 === 91 === Formulation of UV curable resins used in this study contains aliphatic polyester based urethane diacrylate oligomer, tripropylene glycol diacrylate as difunctional monomer diluter and photoinitiator. In this study, concentration of photoinitiator and monomer diluter and clay in the formulation was varied separately to investigate its effect on the curing behavior and the thermo- physical properties of cured film. FTIR was employed to monitor the UV curing reaction and find the radiating time for complete reaction. UV Curing kinetic study was carried out on Differential Photo Calorimeter. Thermal properties of UV cured film were determined by DSC, TGA and TMA . Surface hardness was measured by micro-scratch.
Data from Photo-DSC study pointed out that increase the concentration of photoinitiator in the formulation accompanied with an increase in curing rate, and the cured films showed a lower decomposition temperature, glass transition temperature and surface hardness. When the concentration of diluter in the formulation was increased, curing rate also increased; the cured films showed a higher decomposition temperature and glass transition temperature. The following time (t) verse conversion ratio (α) equation is used for kinetic study
where k is reaction constant, m is autoacceleration parameter, n is reaction order.
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