Thermal and Mechanical Properties of Radiation Curable Networks

摘要

The effect of chemical composition of reactive mixtures prepared from bisphenol-A epoxy diacrylate, N-vinyl pyrrolidone (NVP), and trimethylolpropane, N-vinyl pyrrolidone (NVP), and trimethylolpropane triacrylate (TMPTA) on the cure and network properties of UV cured resins is studied by a variety of thermal analysis techniques (DPC, DSC, DMA and TGA) and tensile testing. The glass transition temperature (Tg) and tensile elongation of the cured network. However, being a monoacrylate, NVP decreases the thermal degradation temperature. TMPTA is most effective to enhance the tensile strength, Young's modulus, crosslink density and thermal stability. The observed thermal mechanical properties of UV cured thermoset network can be explained in terms of glass transitiontemperature and chemical crosslink density of the network can be explained in terms of glass transition temperature and chemical crosslink density of the network. Mixture experimental design is demonstrated to be a very useful tool for formulation. The predictive models from regression analysis allow for generation of three dimensional response surface plots for effective overview of trends within the design space. By graphical or numerical optimization, a region of formulation compositions with compromised but balanced properties can be obtained under a given set of requirements.