Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Surface enrichment in polymer blends involving hydrogen bonding
Autore:
Duan, YZ; Pearce, EM; Kwei, TK; Hu, XS; Rafailovich, M; Sokolov, J; Zhou, KG; Schwarz, S;
Indirizzi:
Polytech Univ, Dept Chem & Chem Engn, Brooklyn, NY 11201 USA Polytech Univ Brooklyn NY USA 11201 m & Chem Engn, Brooklyn, NY 11201 USA SUNY Stony Brook, Dept Mat Sci & Engn, Stony Brook, NY 11794 USA SUNY Stony Brook Stony Brook NY USA 11794 Engn, Stony Brook, NY 11794 USA CUNY Queens Coll, Dept Phys, Flushing, NY 11367 USA CUNY Queens Coll Flushing NY USA 11367 Dept Phys, Flushing, NY 11367 USA
Titolo Testata:
MACROMOLECULES
fascicolo: 19, volume: 34, anno: 2001,
pagine: 6761 - 6767
SICI:
0024-9297(20010911)34:19<6761:SEIPBI>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
ESCA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
22
Recensione:
Indirizzi per estratti:
Indirizzo: Pearce, EM Polytech Univ, Dept Chem & Chem Engn, 6 Metrotech Ctr, Brooklyn, NY 11201 USA Polytech Univ 6 Metrotech Ctr Brooklyn NY USA 11201 Y 11201 USA
Citazione:
Y.Z. Duan et al., "Surface enrichment in polymer blends involving hydrogen bonding", MACROMOLEC, 34(19), 2001, pp. 6761-6767

Abstract

A phenolic polysiloxane, poly(4-ethenylphenolmethylsiloxane) (PEPS), that contains the phenolic hydroxyl group as a hydrogen-bond donor has been synthesized via hydrosilylation followed by hydrolysis. It was blended with a number of hydrogen-bond acceptors of different strengths, including poly(4-vinylpyridine) (PVPy) (strong), poly(vinylpyrrolidione) (PVPr) (strong), poly(dimethylacrylamide) (PDMA) (moderate), and poly(styrene-co-acrylonitrile)(PSAN) (weak). All blends were miscible in the bulk, as indicated by a single DSC T-g, and were shown to be homogeneous by optical microscopy. XPS measurements demonstrated that all PEPS blends had surface enrichment in PEPS, which has a lower surface energy. AFM images showed that the surface morphology in PVPy/PEPS, PVPr/PEPS, and PDMA/PEPS blends did not differ from that in the bulk, whereas the PSAN/PEPS blend exhibited a different surface structure that consisted of PSAN covered with a thin layer of PEPS. Depth profiling by SIMS was in agreement with the XPS analysis. The results indicated that (1) surface enrichment in hydrogen-bonding polymer blends is governed by the interplay between the difference in the surface energy of the constituents and the bulk thermodynamics and (2) hydrogen-bonding interactionsreduce surface enrichment.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/07/20 alle ore 05:20:48