Wiley
0022-3832
1542-6238
Cơ quản chủ quản: N/A
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 initiators
Tập 44 Số 143 - Trang 173-182 - 1960
AbstractSpectra 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) syndiotactic
sequences (ldl or dld), and (3) heterotactic sequences (ldd, dll, ddl, or lld).
The conform...
Viscosity and glass temperature relations for polymer‐diluent systems
Tập 50 Số 154 - Trang 549-556 - 1961
AbstractExpressions 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 information required for
the application o...
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 acid
Tập 2 Số 4 - Trang 432-446 - 1947
AbstractPotentiometric 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 if a suitable activity
factor is...
Glass transition temperatures of copolymers
Tập 28 Số 117 - Trang 319-330 - 1958
AbstractThe 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 c1 and c2 are the weight fractions of the
constituents and A1 and A2 are constants. It can be recast into the following
forms suitable for linear plots and where k = A2/A1. Data from the literature on
10 copolymer sy...
Infrared spectra of crystalline polysaccharides. I. Hydrogen bonds in native celluloses
Tập 37 Số 132 - Trang 385-395 - 1959
AbstractThe 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 orientation effects. Two new bands
in ...
Method of colloid titration (a new titration between polymer ions)
Tập 8 Số 2 - Trang 243-253 - 1952
AbstractA 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 polyvinyl alcohol sulfate) and
Macrami...
Polypeptides. VIII. Molecular configurations of poly‐L ‐glutamic acid in water‐dioxane solution
Tập 23 Số 104 - Trang 851-861 - 1957
AbstractThe 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 of 5.4–6.4 reaching values that remain
constant at higher pH....