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Study by thermal analysis of composites prepared from silica gel, furfuryl alcohol and acetaldehyde
Author(s) -
García Teresita de la C,
Gómez Maria R,
Martínez Ricardo,
Alonso Cristina
Publication year - 2003
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.1033
Subject(s) - furfuryl alcohol , acetaldehyde , enthalpy , thermal stability , alcohol , materials science , composite material , polymer , catalysis , chemistry , ethanol , nuclear chemistry , organic chemistry , physics , quantum mechanics
Composites from furfuryl alcohol, acetaldehyde and silica gel were prepared with trifluoracetic acid as a catalyst. The composites were studied by TGA and DSC. The TGA results showed three main losses of weight, the first of which was ascribed to water. The percentage of polymer in the composites reached a limit value, independently of the ratio of furfuryl alcohol/acetaldehyde used. The layer of polymer that covers the silica was not completely cross‐linked. The composites contain soluble oligomers with 97: M n < 580 g mol −1 , that could be extracted with THF. The soluble fraction of composites prepared from mixtures of furfurylic alcohol and acetaldehyde decreased as the proportion of the acetaldehyde increased. The DSC of the samples indicated a T g between −8 and −15 °C that disappeared after an extraction with THF. The DSC of the oligomers removed showed a possible T g at 13 °C and an exothermic peak between 70 and 170 °C which corresponded to an enthalpy of 326.1 J g −1 . © 2003 Society of Chemical Industry