Banca de DEFESA: KAROLINE NÓBREGA CELINO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : KAROLINE NÓBREGA CELINO
DATA : 15/09/2016
HORA: 14:00
LOCAL: LAPET
TÍTULO:

Synthesis and Characterization of copolymers Poly(N-isopropylacrylamide-co- 6-O-vinyladipoyl-D-glucose)

PALAVRAS-CHAVES:

synthesis of polymers; associative polymers; rheometry; hydrophobic association; Stimulus-responsive polymer

PÁGINAS: 74
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Química
SUBÁREA: Química Orgânica
ESPECIALIDADE: Polímeros e Colóides
RESUMO:

In this study was performed synthesis and characterization of copolymers from N-isopropylacrylamide (Nipam) and 6-O-vinyladipoyl-D-glucose) (ADG) using the molar ratios  of Nipam:ADG 1:9, 3:7, 1:1, 7:3 and 9:1. The homopolymers were also synthesized and characterized, Nipam and ADG, aiming to evaluate the influence of the addition of ADG in polymer. The polymers were submitted to characterization using spectroscopy in the infrared (FTIR), nuclear magnetic resonance of hydrogen (¹H), rheometry and elemental analysis (CHNO). The copolymers obtained from 30, 50 and 70 mol% of ADG feed had water insolubility. This result was associated with the formation of micellar aggregates compact with predominantly hydrophilic surface and core predominantly hydrophobic. In such cases, the percentage of embedded ADG, indicated by ¹H NMR and CHNO, was about the same, which explains the decrease in the yield of these reactions. The FTIR and ¹H NMR spectra of the copolymers confirmed the insertion of Nipam and the ADG for all samples. The copolymers obtained from 10 to 90 mol% of the feed ADG were soluble in water and its composition was determined by ¹H NMR, respectively, Nipam:ADG 9:1 and 3:7. The poly (Nipam-co-ADG) 9:1 produced a significant increase of viscosity in water, even at low concentrations, which can be attributed to its associative character.

MEMBROS DA BANCA:
Interno - 2203888 - MARCIA RODRIGUES PEREIRA
Externo à Instituição - REGINA CELIA MONTEIRO DE PAULA - UFC
Presidente - 1149440 - ROSANGELA DE CARVALHO BALABAN