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Molecular Weight and Molecular Weight Distribution of Kraft Lignins
MRS Proceedings, 1990ABSTRACTKraft lignins are the lignin degradation products from kraft pulping. They are complex, heterogeneous polymers with some polar character. The molecular weight of kraft lignins greatly affect the physical properties of black liquors, and are of primary importance in separation from black liquor and in evaluating potential uses.Several purified ...
Wolfgang Schmidl +2 more
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Nature, 1962
IN a recent article Wright1 put forward the hypothesis that the molecular weights of the enzymes tabulated by Dixon and Webb2 fall near three series of numbers expressed by 2n × 12,000, 2n × 16,000 and 2n × 19,000, n taking integral values 0–4. This hypothesis was based entirely on the experimental values themselves, mainly by means of graphical ...
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IN a recent article Wright1 put forward the hypothesis that the molecular weights of the enzymes tabulated by Dixon and Webb2 fall near three series of numbers expressed by 2n × 12,000, 2n × 16,000 and 2n × 19,000, n taking integral values 0–4. This hypothesis was based entirely on the experimental values themselves, mainly by means of graphical ...
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The molecular weight of a-chymotrypsinogen
Biochimica et Biophysica Acta, 1957Abstract The molecular weight of crystalline a-chymotrypsinogen has been determined from amino acid analysis, light-scattering, and sedimentation-diffusion measurements. The values obtained by the use of these methods are, respectively, 25,100, 26,000 and 24,200.
P E, WILCOX +3 more
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Tuning Entanglement Molecular Weights with Ultrahigh-Molecular-Weight Polystyrenics
Journal of the American Chemical SocietyWe report a method to produce ultrahigh-molecular-weight (UHMW, >106 Da) styrenic polymers with tunable entanglement molecular weights (Me). The high number of primary chain entanglements (≫10) results in good mechanical strength and dimensional stability at elevated temperatures while maintaining melt and solution reprocessability over multiple cycles
Joshua D. Marquez +9 more
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Journal of Applied Polymer Science, 1980
AbstractFollowing the molecular weight characterization of two polybutadiene samples, it was found that Mw from gel permeation chromatography with universal calibration and light scattering were in agreement, but Mn by gel permeation chromatography was less than Mn from membrane osmometry.
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AbstractFollowing the molecular weight characterization of two polybutadiene samples, it was found that Mw from gel permeation chromatography with universal calibration and light scattering were in agreement, but Mn by gel permeation chromatography was less than Mn from membrane osmometry.
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Determination of Molecular Weight and Molecular-Weight Distribution
1977Molecular-weight determination methods can be classed as absolute, equivalent, or relative. Absolute methods allow the molecular weight to be calculated directly from the measured quantities; a knowledge of the physical and chemical structure of the molecules is not required.
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Determination of Molecular Weights and Molecular Weight Distribution of Polyacrylamides
SPE Annual Technical Conference and Exhibition, 1984ABSTRACT A high-performance, size-exclusion chromatography procedure has been developed for determining molecular weights and molecular weight distributions of polyacrylamides. The procedure can be applied to dry or emulsion polyacrylamides. Virgin polymers and polymers passed through Berea sandstone cores can be analyzed. The analytical
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Molecular weight and molecular weight distribution
2000Kenji Kamide, Toshiaki Dobashi
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Precise Control of Both Dispersity and Molecular Weight Distribution Shape by Polymer Blending
Angewandte Chemie - International Edition, 2021Nghia Truong Phuoc +2 more
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