Results 201 to 210 of about 2,713 (253)
MECHANISMS OF CHAIN MOTION OF MACROMOLECULAR SUBSTANCES
, 2020 George Wypych
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Thermal Activation Energy and Semiconducting Properties of Macromolecular Substances
Journal of Polymer Science Part C: Polymer Symposia, 1969 Marian Kryszewski, Aleksander Szymański
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Imaging of Humic Substance Macromolecular Structures in Water and Soils
Science, 1999Humic substances (HSs) are the natural organic polyelectrolytes formed from the biochemical weathering of plant and animal remains. Their macromolecular structure and chemistry determine their role in biogeochemical processes. In situ spectromicroscopic evidence showed that the HS macromolecular structures (size and shape) vary as a function of HS ...
W. Meyer-Ilse +3 more
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Modification of Macromolecular Substances
2012The term “modification of macromolecular substances” is used for chemical and physical processes that are carried out after the actual synthesis, i.e., on the finished macromolecule. Chemical modifications are, for example, the conversion of ester side groups to hydroxy groups, chemical degradation and crosslinking reactions. Physical modifications are
Helmut Ritter +4 more
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The Crystalline State of Macromolecular Substances
Angewandte Chemie International Edition in English, 1974AbstractUnlike low molecular weight substances, high polymers do not crystallize completely. However long the crystallization process is continued, they still consist of a mixture of crystalline and non crystalline regions. In the undrawn material, these regions form larger units which are known as spherulites.
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Macromolecular changes of humic substances induced by interaction with organic acids
European Journal of Soil Science, 1996SummaryTwo different humic materials, one from a forest soil and the other from wormcasts, were used to study the influence of mineral and organic acids on the conformational properties of humic substances. The macromolecular changes were followed by low pressure gel permeation chromatography after titrating humic material to low pHs with acids.
PICCOLO A +2 more
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Chapter 49 Macromolecular substances and plastics
1975Publisher Summary This chapter discusses macromolecular substances and plastics. In industry, gel permeation chromatography (GPC) serves as a method for characterizing and analyzing new polymeric products and for controlling the quality of standard products (Harmon).
J. Čoupek, M. Kubín
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Pharmacological Research Communications, 1975
Summary Some principles at the basis of the potential interest of macromolecular drugs are defined. The main lines of a research on purposely tailored synthetic high polymers acting as precursors of non-macromolecular active substances are given. The chemical aspects of proper design of these polymers are discussed in detail.
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Summary Some principles at the basis of the potential interest of macromolecular drugs are defined. The main lines of a research on purposely tailored synthetic high polymers acting as precursors of non-macromolecular active substances are given. The chemical aspects of proper design of these polymers are discussed in detail.
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On the mechanism of collapse of monolayers of macromolecular substances II. Cellulose acetate
Journal of Colloid and Interface Science, 1980Abstract The phenomenon of collapse of monolayers of cellulose acetate, describable according to the Prout-Tompkins law, that is as a phenomenon of nucleation and growth with interference during growth, was studied. Ellipsometric measurements and measurements made by optical and electronic microscopy confirm the above mechanism.
Piero Baglioni +2 more
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