Data/hora: 18/06/2024 01:05:09

Biblioteca(s): 	Embrapa Instrumentação.	
Data corrente: 	12/02/2001	
Data da última atualização: 	14/04/2008	
Autoria: 	MELLO, N. C.; FERREIRA, F. C.; CURVELLO, A. A. S.; COLNAGO, L. A.; MATTOSO, L. H. C.	
Afiliação: 	Embrapa Instrumentacao Agropecuaria; USP-Instituto de Fisica e Quimica de Sao Carlos.	
Título: 	Analysis of benzylated sisal fibres by solid state NMR.	
Ano de publicação: 	2000	
Fonte/Imprenta: 	In: CONGRESS AMPERE ON MAGNETIC RESONANCE AND RELATED PHENOMENA, 30., Lisbon. Book of abstracts... Lisboa: Universidade Nova de Lisboa-Fac. Ciencias e Tecnologia, 2000. p. 89.	
Idioma: 	Inglês	
Conteúdo: 	Sisal fibres have been used to replace synthetic fibres, including fibre glass, in many technological applications due its excellent biodegradability. To improve its chemical and physical properties we are treating the fibres with benzyl chloride. To evaluate the effects of this reaction in the sisal and the degree of substitution of the cellulose we used 13C solid state NMR. With this technique we are able to evaluated the effect of reaction in the crystallinity of cellulose, the remotion of lignin and polioses, and measurement of the degree of benzylation in a semi quantitative way. For the amount of cellulose in crystalline state we used the area of the signal in 89 ppm. For lignin presence we used the carbonil signal in 173 ppm and metil group in 23 ppm. To measure the degree of substitution we used the signal area in 129 and 138 ppm (benzyl group) and the cellulose signal from 105 to 65 ppm. A graphic of these ratios versus the reaction times shws a rapid incorporation of benzyl group and a plateau, in 12 hours of reaction, given the maximum degree of substitution.	
Palavras-Chave: 	Evento cientifico; Fibras; Instrumentacao; Polioses.	
Thesagro: 	Biodegradação; Celulose; Sisal.	
Thesaurus Nal: 	instrumentation.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Instrumentação (CNPDIA)	
Exemplares: 	CNPDIA - (5835-1) - UPC - SP - -- - PROCI-00.00111 -  - 2000.00111 - DIS