Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConvergent synthesis of monodisperse dendrimers based upon 1,3,5-trisubstituted benzenesTimothy M. Miller and Thomas X. NeenanCite this: Chem. Mater. 1990, 2, 4, 346–349Publication Date (Print):July 1, 1990Publication History Published online1 May 2002Published inissue 1 Jul…
Using the generalized Landau model [Phys. Rev. A 36, 1484 (1987)], the temperature and frequency dependence of the complex dielectric constant of the ferroelectric smectic-${\mathit{C}}^{\mathrm{*}}$ (Sm-${\mathit{C}}^{\mathrm{*}}$) phase and the corresponding smectic-A (Sm-A) phase is calculated. It is demonstrated h…
Two synthetic routes have been developed to produce high‐molecular‐weight organic precursors containing a high weight fraction of nitrogen. One of the precursors is a pyrolysis residue of melamine‐formaldehyde resin. The second precursor is the byproduct of an unusual low‐temperature combustion reaction of tetrazole a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBond strengths of ethylene and acetyleneKent M. Ervin, Scott Gronert, S. E. Barlow, Mary K. Gilles, Alex G. Harrison, Veronica M. Bierbaum, Charles H. DePuy, W. C. Lineberger, and G. Barney EllisonCite this: J. Am. Chem. Soc. 1990, 112, 15, 5750–5759Publication Date (Print):…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrically conductive polymer-ultrahigh-modulus polymer alloys. A solution processing route to hybrid fibers of Kevlar-polypyrroleHiroaki Nemoto, Tobin J. Marks, Donald C. De Groot, and Carl R. KannewurfCite this: Chem. Mater. 1990, 2, 4, 349–351Publication Date (Print):Ju…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSix-coordinate quantum-mechanically weakley spin-mixed (S = 5/2, 3/2) (triflato)aquoiron(III) "picket-fence" porphyrin complex: synthesis and structural, Moessbauer, EPR, and magnetic characterizationA. Gismelseed, E. L. Bominaar, E. Bill, A. X. Trautwein, H. Winkler, H. Nas…
Polyaniline films electrodeposited from acidified nonaqueous organic media were investigated for their electropolymerization behavior and charge‐discharge characteristics. The solution system used for the electropolymerization of polyaniline film was CF 3 COOH acidified propylene carbonate, which was previously found…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of poly(diarylamines): a new class of electrochromic conducting polymersJean Guay, Royston Paynter, and Le H. DaoCite this: Macromolecules 1990, 23, 15, 3598–3605Publication Date (Print):July 1, 1990Publication History Published online1 May 200…
Abstract The oxidation kinetics of polycrystalline hafnium (Hf) at room temperature and low oxygen pressure ( P o 2 ∼ 10 −7 Torr) has been studied by x‐ray photoelectron spectroscopy (XPS). After a chemisorption stage for exposures ⩽ 5 L, Hf suboxides are initially formed and are dominant until ∼ 25 L. HfO 2 appears a…
The thermal expansion coefficients of transition‐metal‐free sinter mullite and fused mullite, and of chromium‐doped (11.5 wt% Cr 2 O 3 ) and iron‐doped (10.3 wt% Fe 2 O 3 ) sinter mullites are measured between 25° and 900°C by high‐temperature Guinier X‐ray diffraction techniques. Most mullites display low and nonline…
It is shown how a partial discharge (PD) within a test sample generates a signal that can be measured outside the apparatus under test. Because the transfer function between the phenomenon within the apparatus under test and the signal that can be measured can vary widely, measured partial-discharge magnitudes rarely…
The passage of dislocations across grain boundaries in metals has been studied by using the in situ TEM deformation technique. A detailed analysis of the interaction of glissile matrix dislocations with grain-boundary dislocations has been performed. The results show that the dislocations piled-up at the grain boundar…
New highly sensitive thermoluminescence detectors of broad application on the basis of anion-defective a-Al2O3:C single crystals have been developed. The decisive role of non-stoichiometry in forming luminescence properties of crystals has been ascertained by methods of optical, luminescence and exoemission spectrosco…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDabco-metalloporphyrin binding: ternary complexes, host-guest chemistry and the measurement of .pi.-.pi. interactionsChristopher A. Hunter, M. Nafees Meah, and Jeremy K. M. SandersCite this: J. Am. Chem. Soc. 1990, 112, 15, 5773–5780Publication Date (Print):July 1, 1990Publi…
Alcaligenes latus, Alcaligenes eutrophus, Bacillus cereus, Pseudomonas pseudoflava, Pseudomonas cepacia, and Micrococcus halodenitrificans were found to accumulate poly-(beta-hydroxybutyric-co-beta-hydroxyvaleric) acid [P(HB-co-HV)] copolymer when supplied with glucose (or sucrose in the case of A. latus) and propioni…
A systematic study of hysteresis in model continuum and lattice spin systems is undertaken by constructing a statistical-mechanical theory wherein spatial fluctuations of the order parameter are incorporated. The theory is used to study the shapes and areas of the hysteresis loops as functions of the amplitude (${\mat…
Abstract Organic acids can form stable complexes with metals and therefore can affect metal solubility and speciation. The low‐molecular‐weight aliphatic organic acids extracted in water and present in soil solution from O, A, Bh and Bt horizons from a group of forested Utlisols, Entisols and Spodosols were identified…
Abstract We present chain structure, phase morphology, and toughness relationships in thermoplastic polymers and polymer/rubber blends. In neat polymers, molecular aspects of craze/yield behavior are controlled by two chain parameters: entanglement density ν e and characteristic ratio C ∞ . The crazing stress is propo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA new ambient-pressure organic superconductor, .kappa.-(ET)2Cu[N(CN)2]Br, with the highest transition temperature yet observed (inductive onset Tc = 11.6 K, resistive onset = 12.5 K)Aravinda M. Kini, Urs Geiser, Hau H. Wang, K. Douglas Carlson, Jack M. Williams, W. K. Kwok,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTActivation hardness: new index for describing the orientation of electrophilic aromatic substitutionZhongxiang Zhou and Robert G. ParrCite this: J. Am. Chem. Soc. 1990, 112, 15, 5720–5724Publication Date (Print):July 1, 1990Publication History Published online1 May 2002Publi…