标准编号：ISO 307:2007
中文名称：塑料 聚酰胺 粘度值的测定
英文名称：Plastics — Polyamides — Determination of viscosity number
发布日期：2007-05
标准范围
This International Standard specifies a method for the determination of the viscosity number of dilute solutionsof polyamides in certain specified solvents.Polyamide samples must be completely soluble in the solvents mentioned. Additives such as flame-retardantsand modifiers often interfere with the viscosity measurement, having an increasing effect on the viscositynumber in formic acid and a decreasing effect on the viscosity number in sulfuric acid. The extent of the effectfor polyamide compounds depends on the additive, the quantity of the additive, the presence of otheradditives and the compounding conditions.For pure polyamides or polyamides containing additives that do not interfere with the viscosity measurement,the determination of the viscosity number of a polyamide provides a measure of the molecular mass of thepolymer. The viscosity number of pure polyamides or polyamides which contain additives that do not interferewith the viscosity measurement can be converted from one solvent to another.The viscosity number of polyamides containing additives that do interfere with the viscosity measurement isspecific to the solvent used and the material composition. In this case, the measured viscosity number cannotbe converted from one solvent to another.The method is applicable to the polyamides designated PA 46, PA 6, PA 66, PA 69, PA 610, PA 612, PA 11,PA 12, PA 6T/66, PA 6I/6T, PA 6T/6I/66, PA 6T/6I, PA 6I/6T/66 and PA MXD6 as defined in ISO 1874-1, aswell as to copolyamides, compounds of polyamides and other polyamides that are soluble in one of thespecified solvents under the specified conditions.The method is not applicable to polyamides produced by anionic polymerization of lactams or produced withcross-linking agents; such polyamides are normally insoluble in the specified solvents.The viscosity number is determined by the general procedure specified in ISO 1628-1, observing the particularconditions specified in this International Standard.
立即下载标准文件