TY - GEN
T1 - Glassy-rubbery transition behavior of epoxy resins used in FRP structural strengthening systems
AU - Jaipuriar, Anurag
AU - Flood, Jeffrey P.
AU - Bakis, Charles E.
AU - Lopez, Maria M.
AU - He, Xiongjun
PY - 2011/1/1
Y1 - 2011/1/1
N2 - The glass transition behavior of five different epoxies, commercially available as primers and saturants for FRP strengthening systems, have been investigated using dynamic mechanical analysis. Glass transition temperatures, Tg, were assigned using three methods: storage modulus onset, loss modulus peak, and tan δ peak. Based on the Tg values, a comparison of the five epoxies as well as the three different methods of T g assignment were made. It was observed that post-curing during the DMA test procedure can have a dramatic effect on the glass transition behavior, with Tg values increasing up to 22° C on two short exposures to the maximum test temperature. For a given product, the difference in T g values as a function of test method ranged from 12°C to 42°C on the first thermal cycle. Two Tg values were observed for one of the products, indicating the presence of secondary polymer as a blend or copolymer. Epoxy polymers used as saturants showed a higher transition temperature than those used as primers and adhesives.
AB - The glass transition behavior of five different epoxies, commercially available as primers and saturants for FRP strengthening systems, have been investigated using dynamic mechanical analysis. Glass transition temperatures, Tg, were assigned using three methods: storage modulus onset, loss modulus peak, and tan δ peak. Based on the Tg values, a comparison of the five epoxies as well as the three different methods of T g assignment were made. It was observed that post-curing during the DMA test procedure can have a dramatic effect on the glass transition behavior, with Tg values increasing up to 22° C on two short exposures to the maximum test temperature. For a given product, the difference in T g values as a function of test method ranged from 12°C to 42°C on the first thermal cycle. Two Tg values were observed for one of the products, indicating the presence of secondary polymer as a blend or copolymer. Epoxy polymers used as saturants showed a higher transition temperature than those used as primers and adhesives.
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U2 - 10.1007/978-3-642-17487-2_86
DO - 10.1007/978-3-642-17487-2_86
M3 - Conference contribution
AN - SCOPUS:84896478098
SN - 9783642174865
T3 - Advances in FRP Composites in Civil Engineering - Proceedings of the 5th International Conference on FRP Composites in Civil Engineering, CICE 2010
SP - 397
EP - 400
BT - Advances in FRP Composites in Civil Engineering - Proceedings of the 5th International Conference on FRP Composites in Civil Engineering, CICE 2010
PB - Springer Berlin Heidelberg
T2 - 5th International Conference on FRP Composites in Civil Engineering, CICE 2010
Y2 - 27 September 2010 through 29 September 2010
ER -