Molecular Weight Testing

molecular weight testing

Polyhedron Laboratories performs molecular weight testing according to ASTM standards, such as Gel Permeation Chromatography (ASTM D 5296-05), Inherent Viscosity (ASTM D 1601-99), Inherent Viscosity (ASTM D 4603-03) Dilute Solution Viscosity (ASTM D 1243-95) and Laser Light Scattering (multi-angle, ASTM D 4001-93). All ASTM standard descriptions below are paraphrased from the ASTM website. Due to copyright restrictions, Polyhedron Laboratories cannot make available copies of standards. Standards can be found and are available at www.astm.org.

ASTM D 6474

High Temperature GPC Molecular Weight Testing
Polyhedron Laboratories ASTM D 6474 test methods measure the molecular weight distribution and molecular weight averages of polyethylene and polypropylene resins. The variation in molecular weights and molecular weight distributions significantly affect physical properties and can determine product strength and flow rates. Polyhedron Laboratories ASTM D 6474 tests are used for quality control and failure analysis applications.
More on ASTM D 6474

ASTM D 5296-05

Standard Test Method for Molecular Weight Averages and Molecular Weight Distribution of Polystyrene by High Performance Size-Exclusion Gel Permeation Chromatography
This test procedure deals with the determination of molecular weight averages and the distribution of molecular weights for linear, soluble polymers by liquid high-performance size-exclusion chromatography (HPSEC). This test procedure method calls for the use of commercially available narrow molecular weight distribution (MWD) polystyrene standards for calibration. This test procedure is valid for specimens containing molecular weight components that have elution volumes falling within the range defined by polystyrene standards.

ASTM D 1601-99

Standard Test Method for Dilute Solution Viscosity of Ethylene Polymers
This test procedure deals with the determination of the dilute solution viscosity of ethylene polymers at 135 degrees Centigrade. This is applicable to a wide spectrum of ethylene polymers having densities from 0.910 to 0.970 g/cm2. Instructions are explained for the determination of the viscosity ratio, inherent viscosity (also referred to as the logarithmic viscosity number), and the limiting viscosity number (intrinsic viscosity).

ASTM D 4603-03

Standard Test Method for Determining Inherent Viscosity of Polyethylene Terephthalate (PET) by Glass Capillary Viscometer
This test procedure is for the determination of the inherent viscosity of polyethylene terephthalate (PET) soluble at 0.50 % concentration in a 60/40 phenol/1,1,2,2-tetrachloroethane solution using a glass capillary viscometer.

ASTM D 1243-95

Standard Test Method for Dilute Solution Viscosity of Vinyl Chloride Polymers
This test procedure deals with the determination of the dilute solution viscosity of vinyl chloride polymers in cyclohexanone. The viscosity is expressed in terms of inherent viscosity (also referred to as the logarithmic viscosity number).

ASTM D 4001-93

Standard Test Method for Determination of Weight-Average Molecular Weight of Polymers By Light Scattering
This test procedure explains the test methods for determining the weight-average molecular weight of polymers by light scattering. It applies to all nonionic homopolymers (branched or linear) that dissolve completely without degradation or reaction to form stable solutions.
Gel Permeation Chromatography ASTM D 5296 (in THF)
Inherent Viscosity ASTM D 1601
Inherent Viscosity ASTM D 4603
Inherent Viscosity ASTM D 1243
Laser Light Scattering (multi-angle) ASTM D 4001

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