Pregled bibliografske jedinice broj: 20596
ANALYSIS OF STRUCTURAL CHANGES INFLUENCE ON RADIATION CROSSLINKING OF UNSATURATED POLYESTER RESINS
ANALYSIS OF STRUCTURAL CHANGES INFLUENCE ON RADIATION CROSSLINKING OF UNSATURATED POLYESTER RESINS // 9th "Tihany" Symposium on Radiation Chemistry
Budimpešta: Hungarian Chemical Society, 1998. (poster, međunarodna recenzija, sažetak, znanstveni)
CROSBI ID: 20596 Za ispravke kontaktirajte CROSBI podršku putem web obrasca
Naslov
ANALYSIS OF STRUCTURAL CHANGES INFLUENCE ON RADIATION CROSSLINKING OF
UNSATURATED POLYESTER RESINS
Autori
Pucić, Irina ; Ranogajec, Franjo
Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni
Skup
9th "Tihany" Symposium on Radiation Chemistry
Mjesto i datum
Tata, Mađarska, 29.08.1998. - 03.09.1998
Vrsta sudjelovanja
Poster
Vrsta recenzije
Međunarodna recenzija
Sažetak
DC-electrical conductivity has shown great sensitivity toward structural changes, especially to some low intensity transitions such as liquid liquid transitions that are difficult ot observe. It also showed favorable properties for monitoring of crosslinking of unsaturated polyester resins. However, when the rates were calculated using commonly applied formula:
k ln s = ln [(ln st - ln so)/(ln sĽ - ln so)]
the sensitivity decreased. The extents of the reaction were shifted on time axis compared to non-logarithmic conductivity data and extraction analysis results. The logarithmic data had pronounced scattering at the end of the reaction so it was very difficult to determine end point of reaction and almost impossible to detect vitrification point. Some other features that can be seen on conductivity plot were lost.
Therefore the results of DC-electrical conductivity monitoring of radiation and thermally initiated crosslinking of unsaturated polyester resins were interpreted in the sam manner as the data collected by other non-electrical methods, using "raw" data instead of its in logarithmic form:
k s = ln [(st - so)/(s Ľ - so)]
By this modification of data analysis full sensitivity of electrical conductivity method to structural changes in reacting system was proven. lower data scattering allowed observation of dose rate influences. The apparent rate constants calculated from conductivity data itself showed thr the influence of upper liquid-liquid transition on the rate of radiation induced reaction that cold not be seen if logarithm of conductivity was used.
Izvorni jezik
Engleski
Znanstvena područja
Kemija
