Materials Literature
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Frequency dispersions with chain length have been experimentally determined from Raman-scattering data published previously on a series of oligomers and polymers of paraphenylene, paraphenylene vinylene, thiophene, N-protected pyrrole, pyrrole, and furan. The dispersion behavior changes noticeably in the different ser…
Enzyme-induced liberation of components from seven different radiolabeled polyurethanes was monitored by radiolabel counting of the incubation solutions and product isolation by high performance liquid chromatography (HPLC). The polyurethanes were selected to reflect variations in the hard-segment chemistry, soft-segm…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyimides Derived from 2,2'-Bis(trifluoromethyl)-4,4'-diaminobiphenyl. 4. Optical Properties of Fluorinated Polyimides for Optoelectronic ComponentsTohru Matsuura, Shinji Ando, Shigekuni Sasaki, and Fumio YamamotoCite this: Macromolecules 1994, 27, 22, 6665–6670Publication…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInvestigations of the Hyperpolarizability in Organic Molecules from Dipolar to Octopolar SystemsT. Verbiest, K. Clays, C. Samyn, J. Wolff, D. Reinhoudt, and A. PersoonsCite this: J. Am. Chem. Soc. 1994, 116, 20, 9320–9323Publication Date (Print):October 1, 1994Publication Hi…
Previously described dendritic and hyperbranched polyesters and a new linear polyester obtained by polymerization of 3-hydroxy-5-(t-butyldimethylsilyloxy)benzoic acid, each based on the 3,5-dihydroxybenzoic acid building block, were used in the study of differences in chemical and physical properties between the three…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReactions of Copper Group Cluster Anions with Oxygen and Carbon MonoxideTaeck Hong Lee and Kent M. ErvinCite this: J. Phys. Chem. 1994, 98, 40, 10023–10031Publication Date (Print):October 1, 1994Publication History Published online1 May 2002Published inissue 1 October 1994ht…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacterization of a Poly(ethylene oxide)-Poly(propylene oxide) Triblock Copolymer (EO27-PO39-EO27) in Aqueous SolutionOtto Glatter, Guenther Scherf, Karin Schillen, and Wyn BrownCite this: Macromolecules 1994, 27, 21, 6046–6054Publication Date (Print):October 1, 1994Public…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAlignment of Lamellar Block Copolymer Microstructure in an Electric Field. 2. Mechanisms of AlignmentKarl Amundson, Eugene Helfand, Xina Quan, Steven D. Hudson, and Steven D. SmithCite this: Macromolecules 1994, 27, 22, 6559–6570Publication Date (Print):October 1, 1994Public…
Toughness characteristics of a heterogeneous silicon carbide with a coarsened and elongated grain structure and an intergranular second phase are evaluated relative to a homogeneous, fine‐grain control using indentation–strength data. The heterogeneous material exhibits a distinctive flaw tolerance, indicative of a pr…
Pb(Zr,Ti)O3 and (Pb,La)(Zr,Ti)O3 thin films and bulk ceramics are shown to exhibit two distinct, but related types of photoinduced changes in their hysteresis behavior: (1) a photoinduced suppression of the switchable polarization and (2) a photoinduced voltage shift. Both effects give rise to stable and reproducible…
Via oxidation a well ordered Al2O3 film may be grown on an ordered NiAl(110) surface. Its structure has been studied with SPA-LEED (spot-profile analysis) as well as with scanning tunneling microscopy (STM). The oxide overlayer grows strictly two-dimensional with a thickness of close to 5 Å. Double diffraction spots h…
Solvation in macromolecular crystal structures was studied by analyzing X-ray diffraction data of two proteins, penicillopepsin and neuraminidase. The quality of several solvent models was assessed by complete cross-validation in order to prevent overfitting the diffraction data. Radial solvent distribution functions…