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Titolo:
MICROSTRUCTURAL ANALYSIS OF POLY(4-N-ACRYLAMIDE-2-HYDROXYBENZOIC ACID) AND POLY(5-N-ACRYLAMIDE-2-HYDROXYBENZOIC ACID) BY C-13 NMR-SPECTROSCOPY
Autore:
BULAI A; ELVIRA C; GALLARDO A; LOZANO A; SANROMAN J;
Indirizzi:
CSIC,INST CIENCIA & TECNOL POLIMEROS,JUAN CIERVA 3 E-28006 MADRID SPAIN CSIC,INST CIENCIA & TECNOL POLIMEROS E-28006 MADRID SPAIN
Titolo Testata:
Polymer
fascicolo: 14, volume: 38, anno: 1997,
pagine: 3625 - 3635
SICI:
0032-3861(1997)38:14<3625:MAOPA>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
POLY(METHYL METHACRYLATE); CHEMICAL-SHIFTS; COPOLYMERS; DYNAMICS;
Keywords:
NMR SPECTROSCOPY; STEREOCHEMISTRY; SUBSTITUTED POLY(ACRYLAMIDES);
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
42
Recensione:
Indirizzi per estratti:
Citazione:
A. Bulai et al., "MICROSTRUCTURAL ANALYSIS OF POLY(4-N-ACRYLAMIDE-2-HYDROXYBENZOIC ACID) AND POLY(5-N-ACRYLAMIDE-2-HYDROXYBENZOIC ACID) BY C-13 NMR-SPECTROSCOPY", Polymer, 38(14), 1997, pp. 3625-3635

Abstract

The microstructural analysis of both poly(4-N-acrylamide-2-hydroxybenzoic acid) (poly(4-AHA)) and poly(5-N-acrylamide-2-hydroxybenzoic acid) (poly(S-AHA)) was carried out by one-dimensional C-13 n.m.r. spectroscopy. The sensitivity of aromatic carbon signals to the stereosequences was found to depend mainly upon the carbon ability to extend into the maximum shielding zone of the neighbouring phenyl rings and carboxyl oxygens. The sensitivity of the amide carbonyl signal to the chain microstructure is influenced mainly by the gamma-gauche shielding effect. Solvent-induced effects in the spectra of poly-(4-AHA) are rationalized in terms of H-bonds (for aromatic carbon signals) and bond conformation changes (for amide carbonyl carbon signal). The increase of amide carbonyl carbon signal sensitivity to the stereosequences in the spectrum of poly(S-AHA) in comparison with that of poly(4-AHA) reflects the conformation changes, induced by the transfer to more sterically crowded polyacrylate. For both poly(4-AHA) and poly(S-AHA) prepared by radical polymerization the Bernoullian statistics is required to fit the observed intensities at the triad and pentad level. (C) 1997 Elsevier Science Ltd.

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Documento generato il 04/12/20 alle ore 20:06:14