Degradation of Poly[vinyl Fluoride] and Poly[vinylidene Fluoride]
(1985). Degradation of Poly[vinyl Fluoride] and Poly[vinylidene Fluoride] Journal of Macromolecular Science, Part C: Vol. 25, No. 2, pp. 227-275.
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Dispersed Systems ‐ Recent Developments
Abstract Direct methods for determining the electrostatic force of interaction between molecularly smooth mica plates are compared with a less direct method (osmotic pressure) of determining the forces between particles (flat plates) in a colloidal dispersion. It is shown that macroscopic surfaces and particles exhibi…
Synthesis and geometry determination of cofacial diporphyrins. EPR spectroscopy of dicopper diporphyrins in frozen solution
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and geometry determination of cofacial diporphyrins. EPR spectroscopy of dicopper diporphyrins in frozen solutionSandra S. Eaton, Gareth R. Eaton, and C. K. ChangCite this: J. Am. Chem. Soc. 1985, 107, 11, 3177–3184Publication Date (Print):May 1, 1985Publication Hi…
Coconut-fiber-reinforced thermosetting plastics
Thermosetting plastic composites have been prepared with phenol–formaldehyde resins as well as unsaturated polyesters as binders and coconut hair as fibrous reinforcement. Using resole-type phenol–formaldehyde resins, the effect of coconut fiber pretreatment by NaOH, the precondensation time of the impregnated fibrous…
Sulfur Vulcanization and Oxidative Aging of Epoxidized Natural Rubber
Abstract 1. Vulcanization by sulfur alone is faster and more efficient for ENR than for NR because isolated double bonds react more rapidly than contiguous double bonds. This vulcanization may be accelerated by sodium carbonate, which also protects the cured rubber against the subsequent effect of oxidative aging, and…
Theory of the isotropic-liquid crystal phase separation for a solution of bidisperse rodlike macromolecules
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTheory of the isotropic-liquid crystal phase separation for a solution of bidisperse rodlike macromoleculesTheo Odijk and Henk N. W. LekkerkerkerCite this: J. Phys. Chem. 1985, 89, 10, 2090–2096Publication Date (Print):May 1, 1985Publication History Published online1 May 200…
Complexes of 1,5‐Di(p‐tolyl)‐1,4‐pentaazadien‐3‐ide, Crystal Structures of [Cu(tolylNNNNNtolyl)]3 and [Ni(tolylNNNNNtolyl)2]2
Three linearly arranged Cu ⊕ ions, coordinated by three parallel N 5 zig‐zag chains in such a way that each metal ion is surrounded by a trigonal planar array of N atoms, are present in the pentaazadienide complex 1 . The red crystals of 1 exhibit weak paramagnetism; the CuCu distances in the chains are the shortest…
Production rates for oxyfluorides SOF2, SO2F2, and SOF4 in SF6 corona discharges
The most abundant, long-lived stable gaseous species generated by corona discharges in SF 6 gas containing trace levels of 0, and H,0 are the oxyfluorides SOF,, SOF, and SOF 4 . Absolute energy and charge rates-ofproduction of these and the minor products SO,, OCS, and CO2 have been measured at different total gas pre…
Heat capacity of semicrystalline, linear poly(oxymethylene) and poly(oxyethylene)
Abstract The heat capacities of 38 semicrystalline poly(oxymethylene)s and poly(oxyethylene)s were determined by differential scanning calorimetry from 205 K through the melting transition. By comparison with the well known limiting heat capacities of the supercooled liquids and the crystals of the macromolecules it w…
Theoretical study on the dimerization of silanone and the properties of the polymeric products (H2SiO)n (n = 2, 3, and 4). Comparison with dimers (H2SiS)2 and (H2CO)2
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTheoretical study on the dimerization of silanone and the properties of the polymeric products (H2SiO)n (n = 2, 3, and 4). Comparison with dimers (H2SiS)2 and (H2CO)2Takako Kudo and Shigeru NagaseCite this: J. Am. Chem. Soc. 1985, 107, 9, 2589–2595Publication Date (Print):Ma…
Polylactones 3. Copolymerization of glycolide with L, L-lactide and other lactones
Numerous copolymerizations of glycolide with β-propiolactone, γ-butyrolactone, δ-valerolactone and ϵ-caprolactone were conducted either in bulk or in nitrobenzene solution at temperatures in the range of 20–150°C. Three classes of catalysts were used, namely acidic catalysts initiating cationic polymerizations, comple…
Thermal regeneration of diesel‐particulate monolithic filters
Abstract A mathematical model is developed to describe the process of thermal regeneration in diesel‐particulate monolithic filters. The model shows that a typical regeneration cycle consists of four stages: preheating, ignition, transport‐controlled combustion, and cooling. The total regeneration time and the peak te…
Anisotropy of Fracture Toughness of Piezoelectric Ceramics
The anisotropy of fracture toughness of PZT‐ and barium titanate‐based piezoelectric ceramics was studied using doubletorsion and indentation methods. The influence of elastic anisotropy and the piezoelectric effect in calculating the K c value are discussed. The fracture toughness in the polarization plane is greater…
Polymorphic transformations in ferroelectric copolymers of vinylidene fluoride induced by electron irradiation
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymorphic transformations in ferroelectric copolymers of vinylidene fluoride induced by electron irradiationAndrew J. LovingerCite this: Macromolecules 1985, 18, 5, 910–918Publication Date (Print):May 1, 1985Publication History Published online1 May 2002Published inissue 1…
Statistical ensembles and molecular dynamics studies of anisotropic solids. II
We have recently discussed how the Parrinello–Rahman theory can be brought into accord with the theory of the elastic and thermodynamic behavior of anisotropic media. This involves the isoenthalpic–isotension ensemble of statistical mechanics. Nosé has developed a canonical ensemble form of molecular dynamics. We comb…
The 266 nm photolysis of ICN: Recoil velocity anisotropies and nascent E,V,R,T excitations for the CN+I(2P3/2) and CN+I(2P1/2) channels
We report the detection of nascent CN(X 2Σ+, v″=0) following the 266 nm photodissociation of 300 K ICN, using sub-Doppler resolution laser-induced fluorescence, and polarized photolysis and probe lasers. When monitoring a particular CN internal state, the translational energies of the I+CN and I*+CN channels differ by…
Residual Stresses in Meta/Ceramic Bonded Strips
Residual stresses that develop during cooling of a metal/ ceramic strip are calculated analytically. It is shown that the metal may behave elastically or plastically (with full or partial plasticity) depending on the mechanical properties, the thickness of the two constituents, and the mismatch in thermal expansion. R…
Chemical bonding and reaction at metal/polymer interfaces
A combination of surface spectroscopy and microanalytical techniques have been used to investigate the chemical and material characteristics of interfaces formed between metal and a high temperature polymer, polyimide. Results reveal significant chemical reactivity at the interface, as manifested by intermixing and cl…
Crystal morphology engineering by "tailor-made" inhibitors; a new probe to fine intermolecular interactions
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal morphology engineering by "tailor-made" inhibitors; a new probe to fine intermolecular interactionsZiva Berkovitch-Yellin, J. Van Mil, L. Addadi, M. Idelson, M. Lahav, and L. LeiserowitzCite this: J. Am. Chem. Soc. 1985, 107, 11, 3111–3122Publication Date (Print):May…
Structure of rhodium in an ultradispersed rhodium/alumina catalyst as studied by EXAFS and other techniques
The structure of rhodium in an ultradispersed 0.57 wt % Rh/y-Al,O, catalyst before and after CO adsorption was studied with extended X-ray absorption fine structure (EXAFS), X-ray photoelectron spectroscopy (XPS), electron spin resonance (ESR), temperature programmed reduction (TPR), CO infrared spectroscopy, and H2 a…