Isothermal curing reaction and mechanics
Time:2016-04-14 09:56Source:sankunClick: Number
The isothermal and dynamic mechanical properties of the curing reaction
Want urethane acrylates have better performance, more experts and synthesis of the vinyl cage half siloxane (V - POSS), methyl propyl acryloyl oxygen radicals cage and a half times the siloxane (MAP - POSS) and methyl acryloyl oxygen propyl trimethyl silane (MAPTMS) modified nano silica, UV curing machine is studied in the amount of the addition of nanoparticles of uv-curable polyurethane acrylate coatings curing behavior, the influence of the thermal and mechanical properties.
Using the differential scanning calorimetry (DSC), dynamic mechanical spectrometer (DMA) to study the V - POSS/epoxy acrylate/acrylate polyurethane non isothermal curing reaction kinetics. The results showed that the curing reaction process in line with the autocatalytic reaction mechanism, the V - POSS content of double bond for 60% of epoxy acrylate/polyurethane acrylate double bond, glass transition temperature peak, raised 5.2 oC.
Make the MAP - POSS, uv-curable polyurethane acrylate coatings modified on the MAP - POSS/methyl glycidyl ester of acrylic (GMA)/polyurethane acrylate (PUA) polymerization principle, dynamic mechanics performance, thermal performance and acid-proof alkaline test of paint film. Surface of the experimental results, the MAP - the addition of POSS, changed the thermal performance, system in the MAP - POSS addition amount to 20 wt %, the initial decomposition temperature raised 7 oC. The MAP - POSS when the mass fraction of 10%, glass transition temperature increased by 12.6 oC speed, coating have excellent acid-proof alkaline.
Made of polyurethane acrylate, and in the modification of silica, tested and dynamic mechanical properties of the coating non-isothermal curing reaction. After curing, the results show that the system can form a uniform system, curing process can use the autocatalytic Š estak - Berggren dynamic model to describe (S - B). When the modified silicon dioxide mass fraction 10%, glass transition temperature to the maximum, 7.3 oC increased performance.
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