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

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Scope

This Standard specifies conditions for the determination of the reduced
viscosity (also known as viscosity) and K-value of PVC resins. It is applicable
to resins in powder form which consist of homopolymers of the monomer vinyl
chloride and copolymers, terpolymers, etc., of vinyl chloride with one or more
other monomers, but where vinyl chloride is the main constituent. The resins
may contain small amounts of unpolymerized substances (e.g. emulsifying or
suspending agents, catalyst residues, etc.) and other substances added during
the course of the polymerization. This Standard is not applicable, however, to
resins having a volatile-matter content in excess of 0.5%, when determined in
accordance with GB/T 2914. In addition to this, it is not applicable to resins
which are not entirely soluble in cyclohexanone.
The reduced viscosity and K-value of a particular resin are related to its
molecular mass, but the relationship varies depending on the concentration and
type(s) of other monomer(s) present. Hence homopolymers and copolymers
having the same reduced viscosity or K-value may not have the same molecular
mass.
The values determined for reduced viscosity and K-value, for a particular
sample of PVC resin, are influenced differently by the concentration of the
solution chosen for the determination. Hence the use of the procedures
described in this Standard will only give values for reduced viscosity and K-
value that are comparable when the concentrations of the solutions used are
identical.

Basic Data

Standard ID	GB/T 3401-2007 (GB/T3401-2007)
Description (Translated English)	Determination of the viscosity of Poly (vinyl chloride) resins in dilute solution using capillary viscometers
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	G32
Classification of International Standard	83.080.20
Word Count Estimation	23,233
Date of Issue	2007-08-13
Date of Implementation	2008-02-01
Older Standard (superseded by this standard)	GB/T 3401-1999
Quoted Standard	GB/T 2914-1999
Adopted Standard	ISO 1628-2-1998, MOD
Regulation (derived from)	National Standard Approval Announcement 2007 No.8 (Total No.108)
Issuing agency(ies)	General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary	This standard specifies the polyvinyl chloride (PVC) resin inherent viscosity (also called viscosity number) measurement conditions and K values. Homopolymers of vinyl chloride and applied to the same one or more other vinyl monomers (but where the main component vinyl chloride) copolymers and terpolymers of such powder resin. Resin may contain minor amounts of non-polymeric materials (e. g., emulsifiers or dispersing agents, residual initiator, etc.) and other substances added to fill in the polymerization process. This standard does not apply to GB/T 2914 measured volatile matter content of more than 0. 5 % of the resin and the resin can not be completely dissolved in cyclohexanone.