Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Influence of temperature and composition on the small-angle neutron scattering from polydiene star diblock copolymers and mixtures with homopolymers
Autore:
Brunacci, AS; Kiff, FT; Richards, RW; Thompson, RL; King, SM;
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 0QX, Oxon, England Rutherford Appleton Lab Didcot Oxon England OX11 0QX 1 0QX, Oxon, England
Titolo Testata:
POLYMER
fascicolo: 7, volume: 41, anno: 2000,
pagine: 2557 - 2567
SICI:
0032-3861(200003)41:7<2557:IOTACO>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
BLOCK-COPOLYMERS; POLYMER BLENDS; MULTICOMPONENT POLYMER; THERMODYNAMIC INTERACTIONS; MICROPHASE SEPARATION; 2 HOMOPOLYMERS; LIQUID-STATE; ARCHITECTURE; MORPHOLOGY; SYSTEMS;
Keywords:
small-angle neutron scattering; polydiene; diblock;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
32
Recensione:
Indirizzi per estratti:
Indirizzo: Richards, RW Univ Durham, Interdisciplinary Res Ctr Polymer Sci & Technol,Durham DH1 3LE, England Univ Durham Durham England DH1 3LE Durham DH1 3LE, England
Citazione:
A.S. Brunacci et al., "Influence of temperature and composition on the small-angle neutron scattering from polydiene star diblock copolymers and mixtures with homopolymers", POLYMER, 41(7), 2000, pp. 2557-2567

Abstract

The small-angle scattering from star diblock copolymers (SDCs) has been calculated using the incompressible random phase approximation (RPA) and methodologies recently developed. The influence of the interaction parameter and incorporation of homopolymer has been explored theoretically for SDCs of deuteriopolybutadiene and polymethylpentadiene with four arms. For the copolymer where the polybutadiene was the outer block of the arm, the scattering over a temperature range from 298 to 418 K has been explored. Fits to thedata have been obtained using the random phase expressions providing values of the interaction parameter and radius of gyration of the inner block. The dimensions of the inner block are unaltered from the unperturbed dimensions of the linear polymer of the same degree of polymerisation. The temperature variation of scattered intensity suggests a spinodal temperature for microphase separation of 196 K. Although the scattering of the mixtures of the SDC with either of the homopolymer exhibited features predicted by the random phase approximation theory, data could only be fitted by using unrealistic values of intermolecular and intramolecular interaction parameters orusing radius of gyration values of the homopolymer that indicated phase separation between SDC and homopolymer. SDC data provide support for phase separation being the pertinent explanation for these phenomena. (C) 1999 Elsevier Science Ltd, All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 24/09/20 alle ore 07:00:19