𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Study by thermal analysis of composites prepared from silica gel, furfuryl alcohol and acetaldehyde

✍ Scribed by Teresita de la C García; Maria R Gómez; Ricardo Martínez; Cristina Alonso

Publisher
John Wiley and Sons
Year
2003
Tongue
English
Weight
110 KB
Volume
52
Category
Article
ISSN
0959-8103

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

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

📜 SIMILAR VOLUMES

Preparation of silica/poloxamer composit
Preparation of silica/poloxamer composite by sol-gel process and pore control of silica gel obtained from the composite
✍ Koji Nakane; Fumio Suzuki 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 167 KB 👁 2 views

Silica gels that controlled the pore size were prepared by calcination of silica/organic polymer (50/50 wt %) composites prepared by the sol-gel process. Poly-(ethylene oxide) (PEO) -poly(propyrene oxide) (PPO) -PEO triblock copolymers, which are called poloxamers, were used as an organic polymer. T

Dynamic-mechanical thermal analysis of a
Dynamic-mechanical thermal analysis of aramid-silica hybrid composites prepared in a sol-gel process
✍ Z. Ahmad; M. I. Sarwar; J. E. Mark 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 225 KB 👁 2 views

Several types of nonbonded and chemically bonded composites of silica with linear and linear-nonlinear aramid polymers were prepared using the sol-gel process. The linear polyamide chains were synthesized by the reaction of a mixture of m-and p-phenylene diamines and terephthaloyl chloride in dimeth