ASTM-D4671 › Historical Revision Information
Standard Test Method for Polyurethane Raw Materials Determination of Unsaturation of Polyols
The following bibliographic material is provided to assist you with your purchasing decision:
Scope
1.1 These test methods measure unsaturation in polyether polyols. (See Note 0.)
1.1.1 Test Method A, High-Volume Reagent MethodUses about 50 mL of 0.1 M mercuric acetate reagent in methanol and 15 g or more of sample. These test methods use an indicator for colorimetric determination of an end point. It is recommended for polyols with low values (below 0.01 millequivalents per gram (meq/g)) of unsaturation where large sample sizes are required.
1.1.2 Test Method B, Low-Volume Reagent MethodUses 2 mL of ca. 0.05 M mercuric acetate reagent in methanol and about 1 g of sample or less. These test methods use a potentiometric determination of an end point.
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.
Note 0There is no equivalent ISO standard.
Significance and Use
These test methods are suitable for quality control, as specification tests, and for research.
Side reactions that form unsaturated compounds in polypropylene oxides produce small amounts of polymers with only one hydroxyl group per chain. These unsaturated polymers lower functionality and molecular weight, while broadening the overall molecular-weight distribution.
Keywords
polyether polyol; polyols; polyurethane raw materials; raw material; titration; unsaturation; ICS Number Code 83.080.20 (Thermoplastic materials)
To find similar documents by ASTM Volume:
08.02 (Plastics (II): D3222 - D5083)
To find similar documents by classification:
83.080.20 (Thermoplastic materials)
This document comes with our free Notification Service, good for the life of the document.
This document is available in either Paper or PDF format.
Document Number
ASTM-D4671-05
Revision Level
2005 EDITION
Status
Superseded
Modification Type
Revision
Publication Date
March 1, 2005
Document Type
Test Method
Page Count
4 pages
Committee Number
D20.22