의미와 용도

4.1 이 테스트는 열 작용으로 인한 셀룰로오스 분해에 대한 민감한 측정입니다., 빛, acids, 기지, oxidants and reducing agents during processing or purification. 만약 원한다면, the intrinsic viscosity value can be converted to degree of polymerization (DP) or intrinsic fluidity.

4.2 Cellulose solutions are not Newtonian liquids; 그건, their viscosity depends on the shear rate or velocity gradient during the measurement. For low molecular weight (DP) samples and low concentration samples, this effect is smaller than for high DP samples and high concentration samples. For cellulose and concentrations contained within the limits described in this test method, the effect of shear rate is assumed to be negligible for judging purposes. This assumption may not be valid for other conditions and for research purposes, but a way to discuss this effect is beyond the scope of this test method.

ASTM D1795-2013 셀룰로오스의 특성 점도에 대한 표준 테스트 방법

단계 1: 범위

1.1 This test method includes the determination of the intrinsic viscosity of purified cellulose, such as bleached wood pulp, cotton lint and regenerated cellulose. It is suitable for all cellulose samples with an intrinsic viscosity of 15dl/g or less. Most natural (unpurified) cellulose has intrinsic viscosity values that are too high to be measured by this test method.

메모 1 – The use of cuprammonium hydroxide solution for conventional viscosity determination is described in Method T206m-55 of the Pulp and Paper Industry Technical Association on “Cuprammonium Dispersion Viscosity of Pulp” and Joint Army-Navy Specification JAN-C-. 206.

1.2 SI 단위로 표현된 값은 표준값으로 간주됩니다.. 이 표준에는 다른 측정 단위가 포함되어 있지 않습니다..

1.3 이 표준은 모든 안전 문제를 해결하기 위한 것이 아닙니다., 만약에 어떠한, 그 사용과 관련된. 적절한 안전 및 보건 관행을 확립하고 사용 전에 규제 제한의 적용 가능성을 결정하는 것은 이 표준 사용자의 책임입니다..