Materials Literature
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The kinetics for the epoxidation of methyl esters of palm olein (MEPOL) by peroxyformic acid and peroxyacetic acid generated in situ were studied. The rate‐determining step was found to be the formation of peroxy acid. Epoxidized MEPOL (EpMEPOL), with almost complete conversion of the unsaturated carbon and negligible…
An Escherichia coli strain has been constructed that produces the copolymer poly-(3-hydroxybutyrate-co-3-hydroxyvalerate) P(HB-co-HV). This has been accomplished by placing the PHB biosynthetic genes from Alcaligenes eutrophus into an E. coli fadR atoC(Con) mutant and culturing the strain in M9 minimal medium containi…
Abstract Specific infrared absorptions for each form of Nylon‐6 have been indentified. Quenched films were prepared by melt casting and converted in turn to the α‐crystalline and γ‐crystalline structures. The films were examined using Fourier transform infrared spectroscopy (FTIR) with the attenuated total reflection…
Recently the interest in ferroelectric materials for memory applications has been renewed on the basis of concepts where ferroelectric thin film capacitors are parts of an Integrated Circuit (IC) process compatible memory cell. This paper shortly reviews the field of ferroelectric memories. The selection, deposition a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe polyelectrolyte brush: poor solventR. S. Ross and P. PincusCite this: Macromolecules 1992, 25, 8, 2177–2183Publication Date (Print):April 1, 1992Publication History Published online1 May 2002Published inissue 1 April 1992https://pubs.acs.org/doi/10.1021/ma00034a018https:…
The piezoelectric and electrostrictive effects in ferroelectric ceramics are reviewed with an emphasis on those properties that are relevant for applications in actua tors. Various contributions to the piezoelectric effect in ferroelectric ceramics, especially lead zirconate titanate ceramics, are discussed in some de…
We present coherent-potential-approximation (CPA) calculations and first- and second-order Raman spectra for diamonds with varying concentrations of $^{12}\mathrm{C}$ and $^{13}\mathrm{C}$. The calculations are based on the valence-force model of Tubino, Piseri, and Zerbi [J. Chem. Phys. 56, 1022 (1972)]. Contrary to…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics and mechanism of synthesis and degradation of poly(3-hydroxybutyrate) in Alcaligenes eutrophusYasushi Kawaguchi and Yoshiharu DoiCite this: Macromolecules 1992, 25, 9, 2324–2329Publication Date (Print):April 27, 1992Publication History Published online1 May 2002Publ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAdsorption of PEO-PPO-PEO block copolymers at silicaMartin Malmsten, Per Linse, and Terence CosgroveCite this: Macromolecules 1992, 25, 9, 2474–2481Publication Date (Print):April 27, 1992Publication History Published online1 May 2002Published inissue 27 April 1992https://doi…
The ambient‐temperature subcritical growth behavior of both long and microstructurally small cracks is investigated during cyclic‐fatigue loading in a SiC‐whisker‐reinforced alumina (Al 2 O 3 –SiC w ) ceramic composite (fracture toughness, K c ∼ 4.5 MPa · m 1/2 ). Based on long‐crack experiments using compact C(T) spe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetal (iron and nickel) carbonyl bond strengths in Fe(CO)n- and Ni(CO)n-L. S. Sunderlin, Dingneng Wang, and Robert R. SquiresCite this: J. Am. Chem. Soc. 1992, 114, 8, 2788–2796Publication Date (Print):April 1, 1992Publication History Published online1 May 2002Published inis…
We report the observation of ordered capillary-wave states generated by three and four standing plane waves. The pattern produced by the four standing plane waves forms the first quasicrystal observed in a fluid dynamical system. The states are observed at aspect ratios above 45, and for amplitudes below the amplitude…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRelationship between the lateral surface free energy .sigma. and the chain structure of melt-crystallized polymersJohn D. Hoffman, Robert L. Miller, Herve Marand, and Daniel B. RoitmanCite this: Macromolecules 1992, 25, 8, 2221–2229Publication Date (Print):April 1, 1992Publi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMean-field theory of block copolymers: bulk melts, surfaces, and thin filmsKenneth R. ShullCite this: Macromolecules 1992, 25, 8, 2122–2133Publication Date (Print):April 1, 1992Publication History Published online1 May 2002Published inissue 1 April 1992https://pubs.acs.org/d…
A hypothesis for aging produced by dry band arcing in silicone rubber material used for outdoor insulation is presented and experimentally proven. Aging is indicated by permanent changes. The analytical techniques used to study the permanent changes are Fourier transform infrared (FTIR) spectroscopy, energy dispersive…
The local concentration and distribution of 1,3-bis(2-chloroethyl)-1-nitrosourea (BCNU) within normal brain tissue were studied following surgical implantation of biodegradable polymer containing BCNU in New Zealand White rabbits. Cylindrical discs of poly(bis(p-carboxyphenoxy)-propane:sebacic acid) copolymer in a 20:…
The results of an analysis of the optical properties of Er/sup 3+/ and (Er/sup 3+/, Yb/sup 3+/) doped Y/sub 2/SiO/sub 5/ single crystals that have been grown by the Czokralski method are presented. These crystals emit a very interesting fluorescence in the eye-safe spectral range around 1550 nm and they can be pumped…
In the conventional rate-theory treatment of irradiation-induced dimensional changes based on the concept of dislocation bias, it is implicitly assumed that interstitials and vacancies are produced continuously and uniformly in the form of Frenkel pairs. This implies that all produced point defects are free and are av…
Model structures of cholesteric liquid crystal droplets embedded in a medium which enforces parallel surface anchoring are treated. Structures with disclination lines of integer and half-integer strength are obtained by minimising the Frank free energy. The constant order parameter approximation appropriate for drople…
The influence of fatigue loading history and microstructural damage on the magnitude of frictional heating and interfacial shear stress in a unidirectional SiC fiber/calcium aluminosilicate matrix composite was investigated. The extent of frictional heating was found to depend upon loading frequency, stress range, and…