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Structure and properties of GPTMS/DETA and GPTMS/EDA hybrid polymers
M.R. Gizdavic-Nikolaidis,N.R. Edmonds,C.J. Bolt,A.J. Easteal 한국물리학회 2008 Current Applied Physics Vol.8 No.3,4
Silica/epoxy hybrid polymers were synthesised from 3-glycidoxypropyltrimethoxysilane (GPTMS) by hydrolysis of the silane func-tional groups in strongly acidic (pH 2) or basic (pH 10) conditions, followed by epoxy ring opening and crosslinking using diethylaminetriamine (DETA) and ethylene diamine (EDA). Structural characterization of the hybrid polymers was performed using FTIR spectros-copy. The thermal properties of GPTMS/DETA and GPTMS/EDA hybrid polymers were investigated by dierential scanning calorim-inuence of pH on the structure and properties of the synthesised GPTMS/DETA and GPTMS/EDA hybrids is discussed
HESSER J. E.,STETSON P. B.,HARRISM W. E.,BOLTE M.,SMECKER-HANE T. A.,VANDENBERG D. A.,BELL R. A.,BOND H. E.,BERGH S. VAN DEN,MCCLURE R. D.,FAHLMAN G. G.,RICHER H. B. The Korean Astronomical Society 1996 Journal of The Korean Astronomical Society Vol.29 No.suppl1
We review observational evidence bearing on the formation of a prototypical large spiral galaxy, the Milky Way. New ground- and space-based studies of globular star clusters and dwarf spheroidal galaxies provide a wealth of information to constrain theories of galaxy formation. It appears likely that the Milky Way formed by an combination of rapid, dissipative collapse and mergers, but the relative contributions of these two mechanisms remain controversial. New evidence, however, indicates that initial star and star cluster formation occurred simultaneously over a volume that presently extends to twice the distance of the Magellanic Clouds.