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Titolo:
Morphological characteristics of 1,3 : 2,4-dibenzylidene sorbitol/poly(propylene glycol) organogels
Autore:
Mercurio, DJ; Spontak, RJ;
Indirizzi:
N Carolina State Univ, Dept Mat Sci & Engn, Raleigh, NC 27695 USA N Carolina State Univ Raleigh NC USA 27695 & Engn, Raleigh, NC 27695 USA N Carolina State Univ, Dept Chem Engn, Raleigh, NC 27695 USA N Carolina State Univ Raleigh NC USA 27695 em Engn, Raleigh, NC 27695 USA
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 11, volume: 105, anno: 2001,
pagine: 2091 - 2098
SICI:
1520-6106(20010322)105:11<2091:MCO1:2>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
NUCLEATING-AGENTS; DIBENZYLIDENE SORBITOL; ISOTACTIC POLYPROPYLENE; RHEOLOGICAL PROPERTIES; PHYSICAL GELS; CRYSTALLIZATION; DERIVATIVES; DEPENDENCE; GELATORS; MATRICES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
35
Recensione:
Indirizzi per estratti:
Indirizzo: Spontak, RJ N Carolina State Univ, Dept Mat Sci & Engn, Raleigh, NC 27695 USA N Carolina State Univ Raleigh NC USA 27695 eigh, NC 27695 USA
Citazione:
D.J. Mercurio e R.J. Spontak, "Morphological characteristics of 1,3 : 2,4-dibenzylidene sorbitol/poly(propylene glycol) organogels", J PHYS CH B, 105(11), 2001, pp. 2091-2098

Abstract

The organic gelator 1,3:2,4-dibenzylidene sorbitol (DBS) self-organizes toform a 3-D network stabilized by hydrogen bends at relatively low concentrations in a Variety of nonpolar organic solvents and polymers. The resultant network consists of nanofibrils and is responsible for the physical gelation of the matrix component. In this work, the morphological characteristics of organogels composed of DBS and poly(propylene glycol) (PPG) are investigated as;functions of DBS concentration, PPG molecular weight, and temperature through the use of polarized light microscopy, transmission electron microscopy, X-ray diffractometry, and spectrophotometry. Polarized light microscopy reveals thermally reversible features that become increasingly morepronounced with increasing DBS concentration. Electron microscopy verifiesthat these features arise due to the presence of a DBS nanofibrillar network, with nanofibrils measuring ca. 10 nm in diameter. Comparison of X-ray diffraction patterns of pure DBS crystals and DBS networks from which PPG isremoved by supercritical fluid extraction reveals that the DBS nanofibrilsare crystalline, differing slightly from the structure of pure DBS. Spectrophotometry is used to probe the temperature-dependent development of the molecular network in DBS/PPG organogels.

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Documento generato il 25/09/20 alle ore 22:02:07