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Control of Molar Mass Distribution by Polymerization in the Analytical Ultracentrifuge [PDF]
Angewandte Chemie International Edition, 2018 AbstractMolar mass distributions are of high interest in macromolecular chemistry because they directly determine the physical and chemical properties of polymers. A principal approach to obtain and control the shape of broad molar mass distributions is adjusting the initiator concentration in free radical polymerizations.
Andreas Spinnrock, Helmut Cölfen
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Renaturation behavior of xanthan with high molar mass and wide molar mass distribution
Polymer Journal, 2016 Light scattering and viscosity measurements were carried out for thermally renatured xanthan samples with various molar masses and molar mass distributions. The increases in the molar mass, radius of gyration, and intrinsic viscosity of a xanthan sample with high molar mass and wide molar mass distribution upon renaturation were smaller than in xanthan
Yasuhiro Matsuda +3 more
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Applied Rheology, 2005 Commercially available, blended methylhydroxyethyl celluloses with similar weight-average molar masses but varying molar mass distributions were characterized by different techniques like steady shear flow and uniaxial elongation in capillary breakup ...
Plog J. P., Kulicke W.-M., Clasen C.
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Polyethylene loss of ductility during oxidation: Effect of initial molar mass distribution [PDF]
Polymer Degradation and Stability, 2018 This paper reports a study of thermal oxidation induced embrittlement in several polyethylene grades differing mainly by the broadness of the molar mass distribution (ranging for lower than 3 to more than 30). Thermal oxidation was monitored at macromolecular scale (Gel Permeation Chromatography, Differential Scanning Calorimetry) and macroscopic scale
Reano, Armando F. +3 more
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Stress relaxation of narrow molar mass distribution polystyrene following uniaxial extension [PDF]
Journal of Rheology, 2008 The stress in the startup of uniaxial elongational flow until steady state, followed by stress relaxation, has been measured for a narrow molar mass distribution polystyrene melt with a molecular weight of 145kg∕mol. The experiments are conducted on a filament stretching rheometer, where a closed loop control of the midfilament diameter ensures ...
Nielsen, Jens Kromann +2 more
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Elongational Viscosity of Narrow Molar Mass Distribution Polystyrene
Macromolecules, 2003 Transient and steady elongational viscosity has been measured for two narrow molar mass distribution polystyrene melts of molar masses 200 000 and 390 000 by means of a filament stretching rheometer. Total Hencky strains of about five have been obtained. The transient elongational viscosity rises above the linear viscoelastic prediction at intermediate
Anders Bach +3 more
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Dispersity-controlled ring-opening polymerization of epoxide [PDF]
Nature CommunicationsDispersity or molar mass distribution (Ð M) profoundly influences polymer properties, but its control remains a challenge, especially for ring-opening polymerization (ROP).
Yubo Zhou, Junpeng Zhao, Guangzhao Zhang
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Cellulose, 2022 Oil-immersed paper insulation and paper pressboards for structural support are widely used in electrical power transformers. Cellulose thus fulfills an essential task for the smooth power supply of our societies.
Paul Jusner +5 more
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Polymer Testing, 2023 Polyethylene terephthalate (PET) films are used when mechanical strength, thermal and chemical stability, and barrier properties to atmospheric gases are required in combination with good processability.
Gernot Oreski +5 more
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Water Science and Technology, 2021 The high resilience to biological treatments from the landfill leachate is generally associated with the presence of humic substances (HS). The brown color characteristic of this effluent is also related to these substances.
Wagner Guadagnin Moravia +4 more
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