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ASTM-D4001:2006 Edition

ASTM-D4001:2006 Edition

$44.96

D4001-93(2006) Standard Test Method for Determination of Weight-Average Molecular Weight of Polymers By Light Scattering

Published By Publication Date Number of Pages
ASTM 2006 12
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1.1 This test method describes the test procedures for determining the weight-average molecular weight M w of polymers by light scattering. It is applicable to all nonionic homopolymers (linear or branched) that dissolve completely without reaction or degradation to form stable solutions. Copolymers and polyelectrolytes are not within its scope. The procedure also allows the determination of the second virial coefficient, A 2 , which is a measure of polymer-solvent interactions, and the root-mean-square radius of gyration ( s 2 ) 1/2 , which is a measure of the dimensions of the polymer chain.

1.2 The molecular-weight range for light scattering is, to some extent, determined by the size of the dissolved polymer molecules and the refractive indices of solvent and polymer. A range frequently stated is 10,000 to 10,000,000, but this may be extended in either direction with suitable systems and by the use of special techniques.

1.2.1 The lower limit to molecular weight results from low levels of excess solution scattering over that of the solvent. The greater the specific refractive increment d n /d c (difference in refractive indices of solution and solvent per unit concentration), the greater the level of solution scattering and the lower the molecular weight that can be determined with a given precision.

1.2.2 The upper limit to molecular weight results from the angular dependence of the solution scattering, which is determined by the molecular size. For sufficiently large molecules, measurements must be made at small scattering angles, which are ultimately outside the range of the photometer used.

1.3 The values stated in SI units are to be regarded as standard.

This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

There are no similar or equivalent ISO standards.

PDF Catalog

PDF Pages PDF Title
1 Scope
Referenced Documents
Terminology
Significance and Use
Apparatus
2 Reagents and Materials
Sample
Preparation of Dust-Free Cell and Contents
Procedure
4 Calculation
5 Report
Precision and Bias
Keywords
6 X1. PHOTOMETERS
X1.1 Typical Photometers
X1.2 Light-Source System
X1.3 Projection Optical System
X1.4 Sample-Cell Area
X1.5 Detector Optical System
X1.6 Detector System
X1.7 Recording System
7 X2. CALIBRATION
X2.1 Purpose and Method
X2.2 Purification of 12-TSA
X2.3 Measurements
8 X2.4 Calculation
X3. TYPICAL DATA
X3.1
X3.2
X3.3
X3.4
X3.5
X3.6
X3.7
X3.8
X3.9
9 TABLE X3.1
FIG. X3.1
10 X4. CORRECTION FACTORS
X4.1 Introduction
X4.2 Absorption Factor
X4.3 Amplification Factor
X4.4 Depolarization Factor
X4.5 Filter Factor
X4.6 Polarization Factor
X4.7 Reflection Factor
11 X4.8 Refraction Factor
X4.9 Volume Factor
REFERENCES

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