I n order to investigate the chemical constitution of bagasse pith-phenol polycondensate resin, different resins were prepared by condensation of phenol with compounds that may be produced during the acid hydrolysis of bagasse pith and with different constituents of bagasse pith. The optimum conditi
Some aspects on the constitution of egyptian bagasse pith-phenol polycondensate resins. Part II. Spectroscopic analysis
โ Scribed by S. M. Sayyah; S. M. Saad; N. E. Metwally; S. M. Shaaban
- Publisher
- John Wiley and Sons
- Year
- 1988
- Tongue
- English
- Weight
- 768 KB
- Volume
- 39
- Category
- Article
- ISSN
- 0323-7648
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โฆ Synopsis
Infraredspectroscopic studies on some phenolic resins prepared by condensation of phenol with furfural, xylose, glucose, holocellulose, resistant cellulose, pure soda lignin, and bagasse pith, were carried out. The I R spectrum of soda ligninphenol resin proves the presence of aliphatic methyl, methylene, methine and strong bonded OH groups. Drastic changes in band position and intensity are observed in the I R spectra of pure soda lignin or bagasse pith and the respective phenolic resins, indicating that degradation processes could take place during the condensation reactions. The I R spectra of fractions of the bagasse pith-phenol resin give an insight in the complicated structure of this resin. NMR and UV spectroscopic studies confirm the IR data.
Zur Struktur w n Polykondemationsharzen aus agyptischem
Bagassemark und Phenol. Teil I I . Spektroskopische Untersuehungen Phenolhane, die durch Polykondensation von Phenol mit Furfural, Xylose, Glucose, Holocellulose, reinem Sodalignin und Bagassemark in saurem Medium hergestellt worden waren, wurden infrarotspektroskopisch untersucht. Im Infrarotspektrum des Sodalignin-Phenolharzes wird die Anwesenheit von aliphatischen Methyl-, Methylen-, Methin-und stark gebundenen OH-Gruppen nachgewiesen. Deutliche h d e r u n g e n der Lage und Intensitat der Banden werden in den Infrarotspektren von reinem Sodalignin bzw. Bagassemark und den entsprechenden Phenolharzen gefunden, was darauf hinweist, daB bei den Kondensationsreaktionen Abbauprozesse stattfinden. Die Infrarotspektren von Fraktionen des Bagassemark-Phenolhanes geben einen Einblick in die komplizierte Struktur dieser Verbindung. NMR-und UVspektroskopische Untersuchungen bestatigen die IR-Ergebnisse. 0 cmpyxmype nonunolu3enca~~rtHuz c.wn u3 ezunemcmii Bazaccat u g5enona. Yacmb I I . Cnecmpocxonuseciue uccneaoaartun p a n o M , KCHJIO~OR, m m ~o 3 0 8 , ~O J I O ~~J I ~~J I O ~O B , WCTHM COHOB~IM j I u r m i I o M II cepgsenmofi 6araccb1. k l K -c n e K -
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