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Titolo:
Dilution wave and negative-order crystallization kinetics of chain molecules
Autore:
Ungar, G; Mandal, PK; Higgs, PG; de Silva, DSM; Boda, E; Chen, CM;
Indirizzi:
Univ Sheffield, Dept Mat Engn, Sheffield S1 3JD, S Yorkshire, England UnivSheffield Sheffield S Yorkshire England S1 3JD S Yorkshire, England Univ Manchester, Sch Biol Sci, Manchester M13 9PT, Lancs, England Univ Manchester Manchester Lancs England M13 9PT M13 9PT, Lancs, England
Titolo Testata:
PHYSICAL REVIEW LETTERS
fascicolo: 20, volume: 85, anno: 2000,
pagine: 4397 - 4400
SICI:
0031-9007(20001113)85:20<4397:DWANCK>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
POLYETHYLENE SINGLE-CRYSTALS; POLYMER CRYSTALS; GROWTH-KINETICS; NORMAL-PARAFFINS; RATES; TEMPERATURE; LENGTHS; ALKANES; ONSET;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
32
Recensione:
Indirizzi per estratti:
Indirizzo: Ungar, G Univ Sheffield, Dept Mat Engn, Sheffield S1 3JD, S Yorkshire, England Univ Sheffield Sheffield S Yorkshire England S1 3JD ire, England
Citazione:
G. Ungar et al., "Dilution wave and negative-order crystallization kinetics of chain molecules", PHYS REV L, 85(20), 2000, pp. 4397-4400

Abstract

We show that the crystal growth rate of a very long-chain n-alkane C198H398 from solution can decrease with increasing supersaturation and follow strongly negative order kinetics. The experimental behavior can be well represented by a theoretical model which allows the molecule to attach and detachas either extended or folded in two. The obstruction of extended-chain growth by unstable folded depositions increases disproportionately with increasing concentration. As a consequence of this abnormal kinetics, a "dilutionwave" can propagate and trigger a folded-to-extended-chain transformation on its way.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/11/20 alle ore 15:52:36