Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorRing-Opening Copolymerization of (R)-β-Butyrolactone with Cyclic Carbonates: New Biodegradable Poly(ester carbonate)sYoji Hori, Yoshiharu Gonda, Yoko Takahashi, and Toshimitsu HagiwaraView Author Information Central Research Laboratory,…
Poly( l -lysine) was reacted with p -phenylazobenzenesulfonyl chloride to give polypeptides containing azobenzene units linked to the Lys chains by means of sulfonamide functions. The azo-modified polymers were soluble in hexafluoro-2-propanol (HFP), in which they exhibited photochromism due to the trans/cis photoisom…
We have developed the WPI cavitational materials process for the production of phase-pure, nanostructured materials. Hydrodynamic cavitation is generated mechanically using a high-pressure fluid system. The method begins with a precipitant stream that experiences a large pressure drop (21 000 psi ambient) across a pat…
Extracorporeal therapies based on membrane hybrid liver support devices using primary hepatocytes are an interesting approach to the treatment of acute hepatic failure. In such devices, semipermeable polymeric membranes are effectively used as immunoselective barriers between a patient's blood and the xenocytes in ord…
The kinetics of the solid-state phase transformation of form β to γ of sulfanilamide in powdered samples have been investigated using energy-dispersive X-ray diffraction (EDXRD) combined with synchrotron radiation. The β to γ transformation which is relatively fast has been followed in real time, courtesy of the high…
Two homologous series of polymers based on poly(vinyl chloride) (PVC) have been prepared by chemical reduction of PVC with lithium aluminum tetrahydride and by chemical substitution of PVC with sodium benzenethiolate. The general formula for both series of copolymers is (CH 2 CHCl) m −(CH 2 CHX) n, with X = H or SC 6…
The synthesis and structural characterization of three mixed-valence π-cation radical derivatives of (octaethylporphinato)metal(II) species, [M(OEP • /2 )] 2 +, (M = Ni, Cu, and (Zn,H 2 )), are reported. The species thus have the same formal ring oxidation level as the photooxidized special pair of photosynthetic reac…
Simple conditions were discovered to afford tripyrranes by reaction of 2,5-bis(α-hydroxymethyl)furan or 2,5-bis(α-hydroxy-α-phenylmethyl)thiophene with excess pyrrole in the presence of acid catalyst. Stepwise synthesis of porphyrins with core-ligand modification and synthesis of meso-tetraarylporphyrins bearing two d…
Behaviour: the contribution of micromechanical approaches to the modelling of inelastic behaviour of polycrystals micromechanisms of plasticity under multilaxial cyclic loading stacking fault energy and cyclic hardening FOC solid solutions undermultiaxial nonproportional loadings yield surfaces and dislocation structu…
Decay rates of four leaf species and birch wood in a softwater stream, changes in ergosterol content of the substrate, and release of conidia of aquatic hyphomycetes from these substrates were followed over time. On all leaves, maximum conidium production occurred before ergosterol content peaked; on birch wood, the t…
The oxidation of lineal, cyclic, and bicyclic aliphatic p -chlorobenzoic and p -chorobenzenesulfonic acid esters 2 with methyl(trifluoromethyl)dioxirane (TFDO) ( 1 ) occurs at positions in the hydrocarbon chain distant from the directing group with a significant degree of selectivity to give the corresponding keto or…
ESR spectroscopy has been used to identify the paramagnetic species trapped at 77 K upon γ-irradiation of glassy water prepared by hyperquenching of liquid water at cooling rates exceeding 10 5 K/s. Besides OH radicals, which are the only paramagnetic intermediates of water radiolysis stabilized at 77 K in hexagonal i…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTEffect of Chain Stiffness on Polymer Phase BehaviorY.-J. Sheng, A. Z. Panagiotopoulos, and S. K. KumarView Author Information School of Chemical Engineering, Cornell University, Ithaca, New York 14850-5201 Department of Materials Science and Engineering, The Pennsylvania State…
Using a two-dimensional self-consistent field theory, we investigate the interaction between two planar surfaces where (1) each surface is grafted with both A and B homopolymers and (2) one surface is coated with end-grafted A's and the other is coated with end-grafted B's. The chains are grafted at low densities and…
The UV (3.8 eV) photolysis of atomically-dispersed Rh I (CO) 2 species supported on an Al 2 O 3 surface in the presence of N 2 at 175 K caused the replacement of CO by N 2 ligands. Therefore dinitrogen chemisorption effectively probes the coordinatively unsaturated Rh(CO) species generated during photodecomposition of…
Small-angle X-ray scattering (SAXS) was employed to investigate the order−disorder transition of low molecular weight polystyrene- block -polyisoprene (SI diblock) copolymers with widely varying composition. The SI diblock copolymers investigated in the present study have molecular weight varying from 15 000 to 41 000…
The deflection of bimorphs consisting of thin films of nickel on silicon substrates has been accurately measured as a function of applied in-plane magnetic field, using an optical method. Striking differences in the magnetoelastic behavior are observed for these systems compared with bulk nickel, mainly due to the ani…
Metallophthalocyanines (MPc's) [M being one of the following metal ions: Co(II), Ni(II), Cu(II), or Zn(II)], bearing amide side chains and being highly soluble in organic solvents, have been synthesized by starting from the corresponding phthalonitrile. All four compounds can form Langmuir and Langmuir−Blodgett films,…
Abstract Carbosilane dendrimers with up to 108 end groups were prepared by a divergent synthetic route via repeated alternating Grignard‐reaction with allylmagnesium bromide and hydrosilylation. Quantitative hydroboration of the dendrimers was achieved with 9‐BBN/H 2 O 2 ,OH − . Employing this synthetic route, rather…
The contact line quadrilateral relation is a generalization of the classical Neumann triangle relation that includes the effect of line tension. The relation is derived using a minimum free energy principle that may be graphically represented by a quadrilateral whose four sides consist of three surface tension quantit…