Wiley
0022-3832
1542-6238
Cơ quản chủ quản: N/A
Lĩnh vực:
Các bài báo tiêu biểu
Linear method for determining monomer reactivity ratios in copolymerization
Tập 5 Số 2 - Trang 259-262 - 1950
Polymer NSR spectroscopy. II. The high resolution spectra of methyl methacrylate polymers prepared with free radical and anionic initiatorsAbstract Spectra of methyl methacrylate polymers in chloroform solution at 90° show three α‐methyl proton peaks. Measurements of their areas in spectra of polymers prepared with free radical and anionic initiators indicate that these may be attributed to (1) isotactic sequences (ddd or lll), (2)...
Tập 44 Số 143 - Trang 173-182 - 1960
Viscosity and glass temperature relations for polymer‐diluent systemsAbstract Expressions are derived from free volume considerations which predict the concentration dependence of viscosity and glass temperature for polymer‐diluent systems. Experimental data for several systems were examined and general agreement with theory was found over broad ranges of concentration. Particular emphasis is placed on the limited amount of informati... ...
Tập 50 Số 154 - Trang 549-556 - 1961
A new method for the preparation of graft copolymers. Polymerization initiated by ceric ion redox systems
Tập 31 Số 122 - Trang 242-243 - 1958
Potentiometric titrations of polymethacrylic acidAbstract Potentiometric titrations of polymethacrylic acid were performed at different concentrations, different molecular weights, and in the presence of neutral salts, as well as in dioxane‐water mixtures. It was shown that the pH of the solutions fulfills the relation, pH = pK — n log [(1 — α)/α]. pK and n are independent of the molecular weight and concentration... ...
Tập 2 Số 4 - Trang 432-446 - 1947
Glass transition temperatures of copolymersAbstract The Gordon‐Taylor equation relating the glass transition temperature θ of a copolymer to the glass transition temperatures θ1 and θ2 of the homopolymers is equivalent to
where c 1 and c 2...
Tập 28 Số 117 - Trang 319-330 - 1958
Infrared spectra of crystalline polysaccharides. I. Hydrogen bonds in native cellulosesAbstract The infrared spectra of oriented films of valonia cellulose and of ramie and bacterial cellulose crystallites have been observed in the 3 μ region. Polarization properties of the bands have also been determined. The differences between the polarized spectra of bacterial and ramie crystallites in this region are attributed to per cent crystallinity and orien... ...
Tập 37 Số 132 - Trang 385-395 - 1959
Method of colloid titration (a new titration between polymer ions)Abstract A general discussion about the method of colloid titrations is given in this report. A new titration method is based on the stoichiometric combination of positive and negative colloid ions. The end point is decided by indicators (known as metachromatic coloring matters) like toluidine blue. The standard colloid reagents are P.V.S.‐K (potassium salt of polyv... ...
Tập 8 Số 2 - Trang 243-253 - 1952
Polypeptides. VIII. Molecular configurations of poly‐L ‐glutamic acid in water‐dioxane solutionAbstract The configuration of a poly‐L‐glutamic acid sample of 34,000 molecular weight has been studied in 0.2 M NaCl‐dioxane (2:1) as a function of pH and temperature by intrinsic viscosity, optical rotation, optical rotatory dispersion and infrared spectroscopy. The intrinsic viscosity and specific rotation fall sharply in the pH range o... ...
Tập 23 Số 104 - Trang 851-861 - 1957