Potřebujeme váš souhlas k využití jednotlivých dat, aby se vám mimo jiné mohly ukazovat informace týkající se vašich zájmů. Souhlas udělíte kliknutím na tlačítko „OK“.
Standard Test Method for Intrinsic Viscosity of Cellulose
Přeložit název
NORMA vydána dne 1.6.2021
Označení normy: ASTM D1795-13(2021)
Datum vydání normy: 1.6.2021
Kód zboží: NS-1028034
Počet stran: 6
Přibližná hmotnost: 18 g (0.04 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
Keywords:
cellulose, intrinsic viscosity,, ICS Number Code 85.040 (Pulps)
Significance and Use | ||||||||
4.1?This test is a sensitive measure of the degradation of cellulose resulting from the action of heat, light, acids, alkalies, oxidizing and reducing agents, and the like, used in its processing or purification. The intrinsic viscosity value may be converted to degree of polymerization (DP) or to intrinsic fluidity, if desired. 4.2?Solutions of cellulose are not Newtonian liquids; that is, their viscosity depends upon the rate-of-shear or velocity gradient during measurement. This effect is smaller for samples of low molecular mass (DP) and at low concentrations than for high-1.1?This test method covers the determination of the intrinsic viscosity of purified celluloses such as bleached wood pulps, cotton linters, and regenerated cellulose. It is applicable to all cellulose samples with an intrinsic viscosity of 15 dL/g or less. Most native (unpurified) celluloses have intrinsic viscosity values too high for measurement by this test method. Note 1:?The use of cuprammonium hydroxide solution for regular
viscosity determination is described in Method T 206 m-55 of the
Technical Association of Pulp and Paper Industry on Cuprammonium
Disperse Viscosity of Pulp, and Joint Army-Navy Specifications
JAN-C-206.
1.2?The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3?This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.4?This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. |
||||||||
2. Referenced Documents | ||||||||
|
Poslední aktualizace: 05.05.2024 (Počet položek: 2 897 047)
© Copyright 2024 NORMSERVIS s.r.o.