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Titolo:
Highly branched block copolymers: Design, synthesis, and morphology
Autore:
Trollsas, M; Kelly, MA; Claesson, H; Siemens, R; Hedrick, JL;
Indirizzi:
IBM Corp, Almaden Res Ctr, Div Res, San Jose, CA 95120 USA IBM Corp San Jose CA USA 95120 n Res Ctr, Div Res, San Jose, CA 95120 USA
Titolo Testata:
MACROMOLECULES
fascicolo: 15, volume: 32, anno: 1999,
pagine: 4917 - 4924
SICI:
0024-9297(19990727)32:15<4917:HBBCDS>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
ALIPHATIC POLYESTERS; RADICAL POLYMERIZATIONS; STAR POLYMERS; GRAFT; MACROMOLECULES; DENDRIMERS; INITIATION; MICELLES; PHASE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
47
Recensione:
Indirizzi per estratti:
Indirizzo: Hedrick, JL IBM Corp, Almaden Res Ctr, Div Res, 650 Harry Rd, San Jose, CA95120 USA IBM Corp 650 Harry Rd San Jose CA USA 95120 Jose, CA 95120 USA
Citazione:
M. Trollsas et al., "Highly branched block copolymers: Design, synthesis, and morphology", MACROMOLEC, 32(15), 1999, pp. 4917-4924

Abstract

Several new approaches to biodegradable dendritic aliphatic block copolymers are described, including hyperbranched and dendrimer-like star structures. The hyperbranched polymers were obtained by the co-condensation of different AB(2) macromonomers. The macromonomers were prepared by ring-opening polymerization (ROP) of either epsilon-caprolactone, L-lactide, or various substituted lactones using the benzyl ester of 2,2'-bis(hydroxymethyl)propionic acid as initiator. Catalytic hydrogenation of the benzyl ester generated the requisite acid functional AB(2) macromonomer. The second route utilizes a new type of molecular architecture, denoted as dendrimer-like star polymers. These block copolymers are described by a radial geometry where the different layers or generations are comprised of high molecular weight polymer emanating from a central core. With this architecture, more control in the placement of the different blocks is afforded over the hyperbranched analogue. As a means of imparting desirable mechanical properties to the dendritic copolymers, a series of new substituted lactones were prepared. The use of such monomers prevents crystallization of the poly(lactone), allowingdendritic polyesters with a range of mechanical properties from thermoplastic elastomers to rubber toughened systems, depending on the relative composition of the two components. The synthesis, characterization, and morphology of these new copolymers are discussed.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/12/20 alle ore 23:58:45