molecular weight distribution (MWDpolymerSummary Gel permeation chromatography (GPC) is the technique of choice for rapid and reliable characterization of molecular weight (MW) averages, molecular weight distribution (MWD), and molecular structure for all types of macromolecules鈥攑roteins, oligomers, ...
A novel and simple method is described for evaluation of molecular weight – viscosity relationships for a polymer where only broad molecular weight distribution samples are available. The method demands measurement of the intrinsic viscosity and GPC chromatograms of several samples. Results of applying...
Also, unlike the conventional method of measuring η using a viscometer or rheometer, the FCVJ-based η measurement does not require any external mechanical perturbation. The term "molecular rotor" has been frequently referred to a group of intramolecular charge-transfer complexes that undergo non...
We report developments in the measurement of transverse elastic properties of a range of polymer fibres. The cylindrical fibre specimen is compressed across a diameter between a pair of parallel flat plates by a known load, while two qua... T Kotani,J Sweeney,IM Ward - 《Journal of Materials...
(TOF)-time-resolved microwave conductivity (TRMC) measurement and photoinduced charge extraction by linearly increasing voltage (photo-CELIV) technique. The charge separation and recombination were found to be stronger power conversion efficiency-governing factors than mobilities and their balance, as ...
Response Factor Variation and Uncertainty Factors in E&L Analysis Additionally, by dissolving a small sample of the failed component in a solvent and assessing the molar mass of the analyte through chromatographic measurement, it is utilized to assess material degradation for failure analysis of polymer...
19, No. 4, pp 413--424 (1987) NMR Measurement of Identical Polymer Samples by Round Robin Method I. Reliability of Chemical Shift and Signal Intensity Measurements Riichiro CH0J6, Koichi HATADA,* Ryozo KITAMARU,** Tatsuki KITAYAMA,* Hisaya SATO,*** and Yasuyuki TANAKA*** Department of ...
Common examples are the number average molecular weight (Mn) and the weight average molecular weight (Mw). The ratio of these two values is the polydispersity index, which is commonly used to express the extent of the molecular weight distribution. A final measurement is the contour length, ...
(ENR) were prepared by dynamic vulcanization technology. The processing torque, crosslink density, morphology of PLA/ENR blends, and PLA's molecular weight during the processing were investigated by HAAKE rheometer, swelling measurement, scanning electron microscopy (SEM), and gel permeation ...
The thermally stimulated depolarization current (TSDC) measurement confirms that blending the molecular semiconductors into a typical heat-resistant dielectric polymer (PEI, i.e., polyetherimide) brings extra carrier trap sites in the resultant all-organic composites, with the trap energy level estimated...