Notícias

Banca de QUALIFICAÇÃO: SÂMIA DANTAS BRAGA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE: SÂMIA DANTAS BRAGA
DATA: 18/08/2017
HORA: 08:30
LOCAL: Auditório do GERATEC - UESPI
TÍTULO: Copolymerization of norbornene with different mono- or diesters of norbornene 2,3-dicarboxylic acid monomers via ROMP
PALAVRAS-CHAVES: copolymers, new materials, norbornene, ROMP, TGA.
PÁGINAS: 21
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Química
SUBÁREA: Físico-Química
ESPECIALIDADE: Cinética Química e Catálise
RESUMO:

Mono- or diesters of norbornene 2,3-dicarboxylic acid (NBE-(COOR)x), in which (COOR)x is the group R, were synthesized from one-pot synthesis method with 5-norbornene-2,3-dicarboxylic acid and methanol, ethanol or propanol. The new monomers were, respectively, the dimethyl ester NBE-(COOCH3)2, 1, diethyl ester NBE-(COOCH2CH3)2, 2, and monopropyl ester NBE-(COOH)(COOCH2CH2CH3), 3. Norbornene was mixtured with 1, 2 or 3 in different proportion and copolymerized via ROMP with 1st generation Grubb’s catalyst under air atmosphere. Yield results show that the elongation of the aliphatic group mono- or diesters influenced the copolymerization process. In the same proportion of co-monomers (0.5:0.5 and 1.0:1.0), the yield decreased as a function of the R group elongation, being from 41.5 to 22.9% and 32.2 to 22.4% for the respective proportions. TGA was performed and in all cases more than one thermal degradation processes was observed, in the same or different co-monomer proportion. The first degradation process was assigned to pendent group degradation and the second one to main chain degradation. Some thermal processes were also influenced by different elongation of the aliphatic group of pendent chain.


MEMBROS DA BANCA:
Presidente - 756.483.183-91 - GERALDO EDUARDO DA LUZ JUNIOR - UESPI
Interno - 1714171 - JANILDO LOPES MAGALHAES
Interno - 1714193 - JOSE MILTON ELIAS DE MATOS
Externo à Instituição - JOSÉ LUIZ SILVA SÁ - UESPI
Notícia cadastrada em: 09/12/2017 21:33
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