Banca de DEFESA: DANIELLE DE MORAES LÚCIO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : DANIELLE DE MORAES LÚCIO
DATA : 16/02/2017
HORA: 08:00
LOCAL: AUDITÓRIO DO CVT
TÍTULO:

EFFECT OF UREA ADDITION ON PROPERTIES OF PHENOLIC ADHESIVES PRODUCED WITH EUCALYPTUS SP. PYROLYTIC OIL

PALAVRAS-CHAVES:

phenol free adhesives; oil tar; pyrolysis; demethylated pyrolytic oil

PÁGINAS: 48
GRANDE ÁREA: Ciências Agrárias
ÁREA: Recursos Florestais e Engenharia Florestal
SUBÁREA: Tecnologia e Utilização de Produtos Florestais
ESPECIALIDADE: Tecnologia de Chapas
RESUMO:

The present work aimed to evaluate the effect of the addition of urea on properties of phenolic adhesives produced with oil from pyrolysis of Eucalyptus sp. Adhesives formulations were synthesized involving two formaldehyde/demethylated oil (F/DO) molar ratios (1.4 and 1.7), three NaOH/DO molar ratios (0.9, 1.0 and 1.1) and five levels of urea (0, 5, 10, 15 and 20%). For all synthesized adhesives, the following properties and parameters were obtained: solids content (%), gel time (s), viscosity (cP), pH, reaction time (min) and temperature (°C). Experimental data were subjected to quadratic regression analysis and models were adjusted for some adhesives properties and reaction conditions (time and temperature). Then tests were performed to verify the identity of regression models and equality of parameters. The simple correlation test indicates that there was influence in the percentages of urea in the adhesive properties. As urea levels increased, the gel time, reaction time, and temperature increased likewise. Better control of the synthesis could be obtained, avoiding the possibility of sudden gelatinization. As a conclusion, the synthesis reactions are more controllable under the following conditions: addition of urea in concentrations ranging from 5 to 10% with F/OD molar ratio of 1.7 and NaOH/OD molar ratio of 0.9.

MEMBROS DA BANCA:
Presidente - 1079298 - ALEXANDRE SANTOS PIMENTA
Interno - 1880266 - ROSIMEIRE CAVALCANTE DOS SANTOS
Interno - 2326526 - TATIANE KELLY BARBOSA DE AZEVEDO CARNAVAL
Externo à Instituição - RENATO VINÍCIUS OLIVEIRA CASTRO - UFSJ