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ASTM D3644-15(2022)

(Test Method)

Standard Test Method for Acid Number of Styrene-Maleic Anhydride Resins

Standard Test Method for Acid Number of Styrene-Maleic Anhydride Resins

SIGNIFICANCE AND USE
4.1 This test method is used to determine the property of styrene-maleic anhydride resins functionality. Acid functionality determines the utility of resin as well as being a significant quality control test.  
4.2 Because some of the anhydride functionality has been hydrolyzed in the manufacturing process, direct titration with base will produce erroneous data on the total acid content of the fully hydrolyzed resin in use. This test method charges excess alkali to hydrolize the anhydride functionality and neutralize the resulting acid. The remaining unreacted alkali is then back titrated with a standardized acid solution and the acid content is determined by difference.
SCOPE
1.1 This test method covers the measurement of the free acidity present in styrene-maleic anhydride resins.  
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.3 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

Status
Published
Publication Date
30-Nov-2022
ICS
83.080.10 - Thermosetting materials
Technical Committee
D21 - Polishes
Drafting Committee
D21.02 - Raw Materials
Current Stage
Ref Project

Relations

Refers
ASTM D329-07 - Standard Specification for Acetone
Effective Date
01-Jun-2007
Refers
ASTM D329-07e1 - Standard Specification for Acetone <a href="#fn00002"></a>
Effective Date
01-Jun-2007
Refers
ASTM D1193-06 - Standard Specification for Reagent Water
Effective Date
01-Mar-2006
Refers
ASTM D329-02 - Standard Specification for Acetone
Effective Date
10-Dec-2002
Refers
ASTM D329-99 - Standard Specification for Acetone
Effective Date
10-Dec-1999
Refers
ASTM D1193-99e1 - Standard Specification for Reagent Water
Effective Date
10-Feb-1999
Refers
ASTM D1193-99 - Standard Specification for Reagent Water
Effective Date
10-Feb-1999

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ASTM D3644-15(2022) - Standard Test Method for Acid Number of Styrene-Maleic Anhydride ResinsASTM D3644-15(2022) - Standard Test Method for Acid Number of Styrene-Maleic Anhydride Resins
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ASTM D3644-15(2022) - Standard Test Method for Acid Number of Styrene-Maleic Anhydride Resins
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This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D3644 − 15 (Reapproved 2022)
Standard Test Method for
Acid Number of Styrene-Maleic Anhydride Resins
This standard is issued under the fixed designation D3644; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 4.2 Because some of the anhydride functionality has been
hydrolyzed in the manufacturing process, direct titration with
1.1 This test method covers the measurement of the free
base will produce erroneous data on the total acid content of
acidity present in styrene-maleic anhydride resins.
the fully hydrolyzed resin in use. This test method charges
1.2 The values stated in SI units are to be regarded as
excess alkali to hydrolize the anhydride functionality and
standard. No other units of measurement are included in this
neutralize the resulting acid. The remaining unreacted alkali is
standard.
thenbacktitratedwithastandardizedacidsolutionandtheacid
1.3 This standard does not purport to address all of the content is determined by difference.
safety concerns, if any, associated with its use. It is the
5. Reagents and Materials
responsibility of the user of this standard to establish appro-
priate safety, health, and environmental practices and deter-
5.1 Purity of Reagents—Reagent grade chemicals shall be
mine the applicability of regulatory limitations prior to use.
used in all tests. Unless otherwise indicated, it is intended that
1.4 This international standard was developed in accor-
all reagents shall conform to the specifications of the Commit-
dance with internationally recognized principles on standard-
tee onAnalytical Reagents of theAmerican Chemical Society,
ization established in the Decision on Principles for the
where such specifications are available. Other grades may be
Development of International Standards, Guides and Recom-
used, provided it is first ascertained that the reagent is of
mendations issued by the World Trade Organization Technical
sufficiently high purity to permit its use without lessening the
Barriers to Trade (TBT) Committee.
accuracy of the determination.
5.2 Purity of Water—Unless otherwise indicated, references
2. Referenced Documents
to water shall be understood to mean reagent water conforming
2.1 ASTM Standards:
to Specification D1193.
D329 Specification for Acetone
5.3 Acetone, conforming to the requirements described in
D1193 Specification for Reagent Water
Specification D329.
3. Terminology
5.4 Phenolphthalein Indicator Solution (20 g/L)—Dissolve
10 g of phenolphthalein in 100 mL of acetone.
3.1 Definitions:
3.1.1 acid number—the number of milligrams of potassium
5.5 Sodium Hydroxide, Standard Solution (0.1 N)—
hydroxide (KOH) required to neutralize the alkali-reactive
Dissolve7gof sodium hydroxide (NaOH) in 7 mL of water,
groups in1gof material under the conditions of test.
and filter the resulting solution through a glass mat in a Gooch
crucible with the aid of suction. Do not wash the residue.
4. Significance and Use
Dilute two thirds of the clear filtrate to 1 L with freshly boiled
4.1 This test method is used to determine the property of
water. Standardize against National Institute of Standards and
styrene-maleic anhydride resins functionality.Acid functional-
Technology standard sample of acid potassium phthalate No.
ity determines the utility of resin as well as being a significant
84, using phenolphthalein as the indicator. Do not adjust the
quality control test.
concentration of the solution, but calculate the normality.
5.6 Sulfuric Acid, Standard Solution (0.1 N)—Measure out
1 3mLofconcentratedsulfuricacid(H SO )(d = 1.84)andpour
ThistestmethodisunderthejurisdictionofASTMCommitteeD21onPolishes 2 4
and is the direct responsibility of Subcommittee D21.02 on Raw Materials.
Current edition approved Dec. 1, 2022. Published December 2022. Originally
approved in 1983. Last previous edition
...

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5.1 This method provides a simple means of characterizing the cure behavior of a thermosetting resin specimen that is a representation of a composite part. The diameter of the specimen is approximately 38 mm and the thickness ranges from 2.6 mm to 3.2 mm. This corresponds to a sample volume of approximately 3 cm3 to 4 cm3. The data may be used for quality control, research and development, and verifying the cure within processing equipment including autoclaves.  
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5.5 This method is valid for a wide range of oscillation frequencies typically from 0.002 Hz to 50 Hz.
Note 1: It is recommended tha...
SCOPE
1.1 This method covers the use of dynamic mechanical instrumentation for determination and reporting of the thermal advancement of cure behavior of thermosetting resin on an inert filler or fiber in a laboratory. It may also be used for determining the cure properties of resins without fillers or fibers. These encapsulated specimens are deformed in torsional shear using dynamic mechanical methods.  
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Standard Test Methods for Polyurethane Raw Materials: Determination of Total Chlorine in Isocyanates

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5.1 These test methods are suitable for use for research or for quality control to determine the total chlorine content of aromatic isocyanates. In some instances total chlorine content may correlate with performance in polyurethane systems.
SCOPE
1.1 These test methods determine the total chlorine content of aromatic isocyanates used as polyurethane raw materials. The difference between the total chlorine content and the hydrolyzable chlorine content (see Test Method D4663) is a measure of the amount of chlorobenzene, o-dichlorobenzene, and other ring-substituted chlorinated products that are present. Both procedures are applicable to a variety of organic compounds but the amount of sample used is varied. (See Note 1.)  
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.  
1.3 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
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