Materials Literature
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Surfaces of commercial polyurethanes (PUs) were modified by poly(ethylene oxide) (PEO) grafting and/or heparin immobilization for long-term biomedical applications. PU surfaces were treated with diisocyanate and then reacted with PEO or heparin. The heparin immobilized by various methods on the PU surface was very sta…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereoregularity in synthetic β-hydroxybutyrate and β-hydroxyvalerate homopolyestersSteven Bloembergen, David A. Holden, Terry L. Bluhm, Gordon K. Hamer, and Robert H. MarchessaultCite this: Macromolecules 1989, 22, 4, 1656–1663Publication Date (Print):April 1, 1989Publicati…
Gadolinium diethylenetriaminepentaacetic acid (DTPA) has not proved particularly useful for hepatosplenic magnetic resonance imaging. However, by entrapping the Gd-DTPA within lipid vesicles, one may exploit the ability of the reticuloendothelial system to endocytose particulates, permitting passive delivery of contra…
Abstract Organic conjugated polymers and oligomers constitute a three‐dimensional network of molecular wires, in which all monomeric units can be functionalized with various prosthetic groups. By varying the nature of these groups, specific interactions with external physical or chemical phenomena can be developed in…
Mechanical properties of polypropylene (PP) filled with wood flour was studied. To improve adhesion at the interface, different surface treatments of the fiber were carried out. Polymethylene polyphenylisocyanate (PMPPIC) and silane coupling agents (silane A-172, A-174, and A-1100) were used to pretreat the fiber befo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRegioselective oxidation catalysis in synthetic phospholipid vesicles. Membrane-spanning steroidal metalloporphyrinsJohn T. Groves and Ronny NeumannCite this: J. Am. Chem. Soc. 1989, 111, 8, 2900–2909Publication Date (Print):April 1, 1989Publication History Published online1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA study of the linear viscoelastic properties of cyclic polystyrenes using creep and recovery measurementsG. B. McKenna, B. J. Hostetter, N. Hadjichristidis, L. J. Fetters, and D. J. PlazekCite this: Macromolecules 1989, 22, 4, 1834–1852Publication Date (Print):April 1, 1989…
A survey is given of the present state of understanding of leader breakdown of electronegative gases in nonuniform field gaps and under fast-rising voltage waveforms. The basic physical processes involved are the formation of a pulsed streamer corona, the transformation of one of the streamers into a leader step, the…
Abstract The molecular process whereby light induces color changes in certain substances, namely photochromism, is currently a topic of active research. Many reactions—mainly monomolecular—have been reexamined in greater detail from the standpoint of photochromism. Those found to be especially suitable for such studie…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicrostructure of bacterially synthesized poly(3-hydroxybutyrate-co-3-hydroxyvalerate)Naoko Kamiya, Yasuhiko Yamamoto, Yoshio Inoue, Riichiro Chujo, and Yoshiharu DoiCite this: Macromolecules 1989, 22, 4, 1676–1682Publication Date (Print):April 1, 1989Publication History Pub…
Abstract Wood cellulose, a versatile and renewable natural resource, has potential for use as a reinforcement for synthetic organic polymers. During the past 80 years a number of materials using the reinforcing properties of wood cellulose have found major markets. Forms of wood cellulose proposed as reinforcements in…
Ergodic behavior in liquids, supercooled liquids, and glasses is examined with a focus on the time scale needed to obtain ergodicity. A measure, d(t), which is based on the time-averaged energies of the individual particles and which is referred to as the ``energy metric,'' is introduced to probe the approach to ergod…
The reaction products formed in a series of fully “equilibrated,” roomtemperature‐hydrated, fumed colloidal silica plus lime water mixtures were examined using 29 Si magic angle spinning nuclear magnetic resonance. The data suggest that two structurally distinct calcium silicate hydrate (C‐S‐H) phases exist in the sys…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOn the double-melting behavior of poly(ether ether ketone)Youngchul Lee, Roger S. Porter, and J. S. LinCite this: Macromolecules 1989, 22, 4, 1756–1760Publication Date (Print):April 1, 1989Publication History Published online1 May 2002Published inissue 1 April 1989https://pu…
Spray‐drying is a convenient process for producing a granulated, flowable powder of uniform bulk density. In this review the effect of feed slurry solids content, viscosity, binder type, and atomization technique on the granule character are discussed. Also, mechanisms of hollow granule formation and binder migration…
The pullout of fibers in the crack wake makes an important contribution to the toughness of ceramic‐matrix composites. The pullout is, in turn, influenced by the properties of the fibers and by the sliding resistance of the interface. Basic relationships governing the pullout are developed analytically and investigate…
ADVERTISEMENT RETURN TO ISSUEPREVArticleOrganoalkali compounds by radical anion induced reductive metalation of phenyl thioethersTheodore Cohen and Mahadevan BhupathyCite this: Acc. Chem. Res. 1989, 22, 4, 152–161Publication Date (Print):April 1, 1989Publication History Published online1 May 2002Published inissue 1 Ap…
Electric‐field‐forced antiferroelectric‐to‐ferroelectric phase transitions in several compositions of modified lead zirconate titanate stannate antiferroelectric ceramics are studied for ultra‐high‐field‐induced strain actuator applications. A maximum field‐induced longitudinal strain of 0.85% and volume expansion of…
The resonance Raman spectrum of 45(+−3) Å diameter CdSe clusters was measured. The incident photons were resonant with the HOMO–LUMO transition in the clusters. At low temperature, one mode at 205 cm−1 is observed, as well as two overtones, with the integrated areas under these peaks in the ratio of 9:3:1. This mode i…
One method of obtaining useful information about the physical chemistry of peptide/bilayer interactions is to relate thermodynamic parameters of the interactions to structural parameters obtained by diffraction methods. We report here the results of the application of this approach to interactions of hydrophobic tripe…