Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Free volume distribution in monodisperse and polydisperse poly(methyl methacrylate) samples
Autore:
Suvegh, K; Klapper, M; Domjan, A; Mullins, S; Wunderlich, W; Vertes, A;
Indirizzi:
Lorand Eotvos Univ, Dept Nucl Chem, H-1518 Budapest, Hungary Lorand EotvosUniv Budapest Hungary H-1518 hem, H-1518 Budapest, Hungary Max Planck Inst Polymer Res, D-55128 Mainz, Germany Max Planck Inst Polymer Res Mainz Germany D-55128 D-55128 Mainz, Germany
Titolo Testata:
MACROMOLECULES
fascicolo: 4, volume: 32, anno: 1999,
pagine: 1147 - 1151
SICI:
0024-9297(19990223)32:4<1147:FVDIMA>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
POSITRON LIFETIME SPECTRA; ANNIHILATION; POLYETHYLENE; SIMULATION; SIZE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
14
Recensione:
Indirizzi per estratti:
Indirizzo: Suvegh, K Lorand Eotvos Univ, Dept Nucl Chem, POB 32, H-1518 Budapest, Hungary Lorand Eotvos Univ POB 32 Budapest Hungary H-1518 pest, Hungary
Citazione:
K. Suvegh et al., "Free volume distribution in monodisperse and polydisperse poly(methyl methacrylate) samples", MACROMOLEC, 32(4), 1999, pp. 1147-1151

Abstract

Several poly(methyl methacrylate) samples of different molecular weight and dispersity were prepared and studied by positron lifetime spectroscopy. According to the lifetime measurements, the free volume holes were smaller and their distribution was narrower in monodisperse PMMA. samples than in polydisperse samples. On the other hand, density measurements revealed that the overall free volume fractions are identical in both kinds of samples. Tocheck these results, we constructed a model for the polymer structure and calculated free volume distributions in it. Theoretical results have not shown dispersity-dependent free volume distributions which suggested that thestructure of compressed PMMA pellets differs from the ideal interaction-free structure considered in calculations. This latter result emphasizes the role of entanglements in the formation of the polymer structure.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 09/04/20 alle ore 00:15:50