ASTM+D+2857(高聚物的稀释溶液的粘度)VIP专享

Designation: D 2857 – 95 (Reapproved 2001)Standard Practice forDilute Solution Viscosity of Polymers1This standard is issued under the fixed designation D 2857; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This practice covers the determination of the dilutesolution viscosity of polymers. There are several ASTMstandards (Test Methods D 789, D 1243, D 1601, and D 4603,and Practice D 3591) that describe dilute solution viscosityprocedures for specific polymers, such as nylon, poly(vinylchloride), polyethylene, and poly(ethylene terephthalate). Thispractice is written to augment these standards when problemsarise with which the specific procedure is not concerned, orwhen no standard is available for the polymer under investi-gation.1.2 This practice is applicable to all polymers that dissolvecompletely without chemical reaction or degradation to formsolutions that are stable with time at a temperature betweenambient and 150°C. Results are usually expressed as relativeviscosity (viscosity ratio), inherent viscosity (logarithmic vis-cosity number), or intrinsic viscosity (limiting viscosity num-ber) (see 3.1).1.3 For polyamides, relative viscosity values by this proce-dure are not equivalent to those determined by Test MethodsD 789.1.4 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-...