GB/T 3401-2007 (English Version) PDF

Standard No.: GB/T 3401-2007
Language: Chinese, Available in English version
Release Date: 2007
Published By: General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
Latest: GB/T 3401-2007
Replace: GB/T 3401-1999

Scope: This standard specifies the conditions for the determination of the reduced viscosity (also known as viscosity number) and K value of polyvinyl chloride (PVC) resins, and is applicable to homopolymers of vinyl chloride and those composed of vinyl chloride and one or more other monomers (but among them The main component is powder type resins such as binary copolymers and terpolymers of vinyl chloride. The resin may contain small amounts of non-polymerizable substances (eg, emulsifiers or dispersants, residual initiators, etc.) and other substances added during polymerization. However, this standard does not apply to resins with a volatile matter content exceeding 0.5% measured according to GB/T 2914 and resins that cannot be completely dissolved in cyclohexanone. The reduced viscosity and K value of a particular resin are related to its relative molecular mass, but the relationship varies depending on the concentration and type of other monomers present. Therefore, homopolymers and copolymers with the same reduced viscosity or K value may also have different relative molecular masses. For a particular PVC resin sample, the concentration of the assay solution chosen will have a different effect on the value used to determine the reduced viscosity or K value. Therefore, the reduced viscosities and K values obtained by following the steps described in this standard can be compared only when the solutions used have the same concentration.

GB/T 3401-2007 Referenced Document

GB/T 2914-1999 Plastics--Homopolymer and copolymer resins of vinyl chloride--Determination of volatile matter(including water)

2007 GB/T 3401-2007 Determination of the viscosity of Poly(vinyl chloride)resins in dilute solution using capillary viscometers
1999 GB/T 3401-1999 Determination of viscosity number of PVC resins in dilute solution