GB/T 1632.4-2020Plastics. Determination of the viscosity of polymers in dilute solution using capillary viscometers - Part 4: Polycarbonate(PC) moulding and extrusion materials (English PDF)

1 Scope

This part of GB/T 1632 specifies a method for determining the viscosity (also known as reduced viscosity) and relative viscosity in a dilute solution of polycarbonate:

This section applies to polycarbonate (PC) pure materials and blends and mixtures with or without other fillers:

2 Normative references

The following documents are indispensable for the application of this document: For dated reference documents, only the dated version applies to this article

Pieces: For undated references, the latest version (including all amendments) applies to this document:

GB/T 1632:1-2008 Plastics use capillary viscometer to determine the viscosity of polymer dilute solutions Part 1: General rules (ISO 1628-1:1998, IDT)

GB/T 11415-1989 Laboratory sintered (porous) filter pore size, classification and grade (ISO 4793:1980, NEQ)

GB/T 30514-2014 glass capillary kinematic viscometer specifications and operating instructions (ISO 3105:1994, MOD)

3 Definitions and units

The definition of the viscosity number VN (in mL/g) is shown in formula (1):

VN=eta

-eta0

eta0c

nurho-nu0rho0

nu0rho0c

nurho

rho0

-nu0

nu0c =

nu-nu0

nu0 (1)

Where:

eta --- the dynamic viscosity of the solution, in Pascal seconds (Pa s);

eta0 --- the dynamic viscosity of the solvent, in Pascal seconds (Pa s);

rho ---The density of the solution, in kilograms per cubic meter (kg/m3);

rho0 ---Solvent density, in kilograms per cubic meter (kg/m3);

nu=eta/rho --- kinematic viscosity of the solution, in square meters per second (m2/s);

nu0=eta0/rho0---solvent kinematic viscosity, in square meters per second (m2/s);

c --- The mass concentration of the polymer solution, in grams per milliliter (g/mL):

Since the difference between the density rho of the solution and the density rho0 of the solvent is very small, the eta in the formula for calculating the reduced viscosity can be replaced by nu: Solution

The relative viscosity etarel (dimensionless), defined in formula (2):

etarel=

nu0 (2)

Where:

nu=eta/rho --- kinematic viscosity of the solution, in square meters per second (m2/s);

nu0=eta0/rho0---Kinematic viscosity of the solvent, in square meters per second (m2/s): […]