Materials Literature
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Abstract A theory of the stress‐induced crystallization of polymeric networks is presented which takes into account 1) the free energy of fusion, 2) crystal surface energies and 3) entropic changes in the amorphous sections of crystallizing chains. It is assumed that the vector running from one end to the other of the…
Abstract Polymerization behavior of hexamethylcyclotrisiloxane (D 3 ) in toluene solution with the use of benzyltrimethylammonium bis( o ‐p;henylenedioxy)phenylsiliconate as a catalyst, dimethyl sulfoxide as promoter, and adventitious moisture as initiator was investigated. The polymerization system gives a linear dif…
Abstract Poly(vinylidene fluoride) (PVdF) was irradiated by 60 Co γ‐rays with and without potassium hydroxide (KOH) under vacum. KOH tablets were added to absorb completely hydrogen fluoride (HF) which is the main volatile product of radiolysis of PVdF in the irradiation cell. In the presence of HF, the rates of radia…
The detailed mass-spectrometric evidence for our original findings [Magnusson et al. (1974) FEBS Lett. 44, 189-193] of ten gamma-carboxyglutamic acid residues in the N-terminal calcium-binding polypeptide of prothrombin is presented. The identification and sequence location of gamma-carboxyglutamic acid was made by el…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyurethane Interpenetrating Polymer Networks. II. Density and Glass Transition Behavior of Polyurethane-Poly(methyl methacrylate) and Polyurethane-Polystyrene IPN'sS. C. Kim, D. Klempner, K. C. Frisch, and H. L. FrischCite this: Macromolecules 1976, 9, 2, 263–266Publicatio…
Abstract The surface morphology of a number of films of AB block copolymers of polydimethylsiloxane and polystyrene was examined by ESCA and contact angle measurements. In all cases the immediate surface is shown to consist of an essentially pure polydimethylsiloxane component. By comparing the intensities of elastic…
Abstract Although the reaction mechanism is obscure at present, 2,4,4,6-tetrabromo-2,5-cyclohexadien-1-one (2) was found to be a good reagent for the selective bromination of polyenes, that is, terminal double bond of geranyl and farnesyl cyanides was selectively brominated by merely being stirred with equimolar amoun…
Abstract A high molecular weight polybutadiene was prepared in hexane solvent by using alkali metal (Li, Na, K) and metal tert ‐butoxide (Li, Na, K) as a polymerization initiator. The microstructure of polybutadiene varies, depending on the type of modifiers and polymerization and temperatures. The results and mechani…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNitrate-induced corrosion of tin plate as affected by organic acid food componentsAna Albu-Yaron and A. SemelCite this: J. Agric. Food Chem. 1976, 24, 2, 344–348Publication Date (Print):March 1, 1976Publication History Published online1 May 2002Published inissue 1 March 1976…
A high-temperature fast-flow reactor (HTFFR) has been adapted to the study of the kinetics of diatomic radicals via laser induced fluorescence. In this work, the homogeneous gas-phase reaction of AlO with O2 has been investigated near 1400 K. The reaction proceeds via AlO(v)+O2→AlO2 +O; k (v) = (3.1±1.7) ×10−13 ml mol…
The polarized Raman spectra of the single-crystalline Cs2[ZnCl4] in the frequency region Δν=0–350 cm−1 at room temperature, and the Raman spectra of the polycrystalline Cs2[ZnCl4] in the same frequency region at 293, 80, and 36 K have been measured. A complete analysis of the spectra in both the metal–ligand optical m…
Relaxation of stress in simple extension of polyisobutylene (viscosity-average molecular weight 2.3×106) has been measured at stretch ratios (λ) up to about 2. Data at 3, 25, and 50°C were reduced to 25°C. At any instant of reduced time, the dependence of stress on λ could be described by the Mooney-Rivlin equation; t…
Abstract The 110 Sn Mössbauer spectrum and the Raman phonons in polycrystalline samples of K 2 [SnCl 5 ] have been investigated in the temperature range from 4 and 150 K, respectively, to 300 K. With decreasing temperature a discontinuous increase of the halfwidth of the Sn‐Mössbauer line and a concommitant change in…
Abstract Part II discusses numerous examples of a morphological fibrillar‐to‐lamellar transformation that has reportedly been observed in stretched polymers upon additional thermal treatment (or TIC), Stretched polymers containing initially a typical fibrillar morphology for either crystallites in cold‐drawn polymers,…
One of the theories of moiré pattern prediction uses the technique of partial sum extraction in the Fourier series expansion of the transmittance distribution which is obtained as the product of composite gratings transmittances. Based on this technique a simple method for the profile prediction of moiré fringes produ…
Pentabromonitrobenzene, pentabromobenzoic acid, pentabromobenzamide, pentabromoacetanilide, barium pentabromobenzenesulphonate, 1,2,4,5 - tetrabromo -3-chloro-6-(trifluoromethyl)benzene, 2,3,5,6-tetrabromo-4-methoxytoluene 2,3,5,6-tetrabromo-4-methoxybenzamide, methyl 2,3,5,6-tetra- bromo-4-methoxybenzoate, and 1,2,5-…
A thermodynamic criterion was developed for predicting the compatibility of insulating ceramics with liquid Na and Li. Nonmetallic impurities in liquid metals were shown to have a profound effect on the compatibility behavior of ceramics. Attempts were made to identify the structural parameters which affect the corros…
Raman and ir spectra in the stretching region of all HgX2 and HgXY molecules (X,Y=Cl, Br, I) trapped in solid Kr at 20 °K are reported. Bands are assigned to modes of monomers and dimers. Bond stretching and interaction force constants are calculated and compared. The possibility of a slightly bent structure for sever…
Abstract A theory of crystallization under stress is developed about the premise that the direction a chain takes through a crystallite, relative to its end‐to‐end vector, is determined by the first few links of a chain that initially deposit onto the crystallite surface. Since these few links are quickly trapped by s…
Lysine aspartate, C 6 H 15 N 2 O 2 ·C 4 H 6 NO 4 , a crystalline complex or lysine and aspartic acid, crystallizes in the monoclinic space group P2 1 with two formula units in a unit cell of dimensions a = 5.539 (3), b = 7.848 (4), c = 15.324 (I5) A, β = 99.1 (I)°. The structure was solved by direct methods and Fourie…