Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
MICROSTRUCTURE OF COPOLYMERS OF METHACRYLONITRILE N-ALKYL METHACRYLATE MIXTURES GRAFTED ONTO AMYLOMAIZE BY C-13-NMR SPECTROSCOPY
Autore:
VAZQUEZ B; GURRUCHAGA M; GONI I; VALERO M; GUZMAN GM; ROMAN JS;
Indirizzi:
CSIC,INST CIENCIA & TECNOL POLIMEROS,JUAN CIERVA 3 E-28006 MADRID SPAIN CSIC,INST CIENCIA & TECNOL POLIMEROS,JUAN CIERVA 3 E-28006 MADRID SPAIN UNIV PAIS VASCO,FAC QUIM,DEPT CIENCIA & TECNOL POLIMEROS SAN SEBASTIAN SPAIN
Titolo Testata:
Macromolecules
fascicolo: 16, volume: 26, anno: 1993,
pagine: 4298 - 4303
SICI:
0024-9297(1993)26:16<4298:MOCOMN>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
NMR-SPECTROSCOPY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
11
Recensione:
Indirizzi per estratti:
Citazione:
B. Vazquez et al., "MICROSTRUCTURE OF COPOLYMERS OF METHACRYLONITRILE N-ALKYL METHACRYLATE MIXTURES GRAFTED ONTO AMYLOMAIZE BY C-13-NMR SPECTROSCOPY", Macromolecules, 26(16), 1993, pp. 4298-4303

Abstract

The microstructure and stereochemical configuration of copolymers of methacrylonitrile (MAN) with methyl methacrylate (MMA), ethyl methacrylate (EMA), and butyl methacrylate (BMA) grafted onto amylomaize are analyzed by C-13-NMR spectroscopy. The graft copolymers were prepared at high conversion by free radical copolymerization in aqueous medium initiated by a redox mechanism with the amylomaize/Ce(IV) system. The composition and distribution of comonomeric units of these copolymers are compared with those of the bulk copolymerization at low conversion using AIBN as initiator. The results obtained indicate that random copolymers with a statistical distribution of comonomeric sequences are obtained at low conversion, but BMA-MAN copolymers prepared at high conversion seem to have relatively long sequences of BMA units in a wide feed composition interval. This behavior is explained taking into consideration the relative solubility of the corresponding alkyl methacrylate and methacrylonitrile in the reaction medium.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 12/07/20 alle ore 06:28:45