Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Partitioning of a heterotelechelic polystyrene to separate interfaces of thin films
Autore:
Hutchings, LR; Richards, RW; Thompson, RL; Bucknall, DG; Clough, AS;
Indirizzi:
Univ Durham, Interdisciplinary Res Ctr Polymer Sci & Technol, Durham DH1 3LE, England Univ Durham Durham England DH1 3LE ci & Technol, Durham DH1 3LE, England Rutherford Appleton Lab, ISIS Sci Div, Didcot OX11 0QZ, Oxon, England Rutherford Appleton Lab Didcot Oxon England OX11 0QZ 1 0QZ, Oxon, England Univ Surrey, Dept Phys, Sch Phys & Chem, Guildford GU2 5XH, Surrey, England Univ Surrey Guildford Surrey England GU2 5XH ord GU2 5XH, Surrey, England
Titolo Testata:
EUROPEAN PHYSICAL JOURNAL E
fascicolo: 4, volume: 5, anno: 2001,
pagine: 451 - 464
SICI:
1292-8941(200107)5:4<451:POAHPT>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
ADSORBED POLYMER BRUSHES; MATRIX MOLECULAR-WEIGHT; NEUTRON REFLECTIVITY; SURFACE-LAYER; END; BLENDS; PROFILES; CHAINS; MELT; SEGREGATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
39
Recensione:
Indirizzi per estratti:
Indirizzo: Hutchings, LR Univ Durham, Interdisciplinary Res Ctr Polymer Sci & Technol, Durham DH1 3LE, England Univ Durham Durham England DH1 3LE Durham DH1 3LE, England
Citazione:
L.R. Hutchings et al., "Partitioning of a heterotelechelic polystyrene to separate interfaces of thin films", EUR PHY J E, 5(4), 2001, pp. 451-464

Abstract

Heteratelechelic deuteropolystyrenes have been synthesised with a tertiaryamine functionality at one end and a fluorocarbon group at the other end of the polymer chain. A layer of this polymer. circa 120 Angstrom thick, hasbeen attached to the surface of a silicon substrate and subsequently covered with a much thicker layer of hydrogenous polystyrene. The combination has then been annealed at 413 K under vacuum for defined times and the subsequent distribution of the deutero heterotelechelic polymer determined using nuclear reaction analysis and neutron reflectometry. The influences of annealing time, molecular weight and thickness of the hydrogenous polymer have been examined. Nuclear reaction analysis showed that an excess of the heterotelechelic polymer formed at both interfaces with a larger excess remaining at the substrate-polymer interface. When the molecular weight of the hydrogenous polymer is lower than that of the deuteropolymer, the deutero layeris initially swollen by the hydrogenous polymer but the thickness then decreases as deutero polymer becomes detached from the silicon substrate and an additional excess layer is eventually formed at the vacuum-polymer surface. When the molecular weight of the hydrogenous polymer is higher, there isan initial shrinkage of the deuteropolymer layer. but the original thickness (similar to radius of gyration of the. deuteropolymer) is regained on prolonged annealing. There is no evidence for bridging between the two interfaces by the heterotelechelic polymer. After five days annealing the volume fraction distribution of the deuteropolymer at the silicon substrate was well described by a self-consistent field model where the only adjustable parameter was the sticking energy of the tertiary amine group to the silicon substrate for which a value of 8 k(B)T was obtained. Comparison of the dependence of the equilibrium layer thickness of the deuteropolymer on the equilibrium grafting density at the silicon surface with the predictions of scaling theory for brush-like polymer layers suggested that the grafted molecules were in the ideal, unperturbed brush region.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 09/08/20 alle ore 23:35:42