ASTM D3644-98(2004)

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

SCOPE
1.1 This test method covers the measurement of the free acidity present in styrene-maleic anhydride resins.
1.2 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.

General Information

• Status: Historical
• Publication Date: 31-Aug-2004
• ICS: 83.080.10 - Thermosetting materials
• Technical Committee: D21 - Polishes
• Drafting Committee: D21.02 - Raw Materials

Relations

• Replaces: ASTM D3644-98 - Standard Test Method for Acid Number of Styrene-Maleic Anhydride Resins
• Effective Date: 01-Sep-2004
• Replaced By: ASTM D3644-06 - Standard Test Method for Acid Number of Styrene-Maleic Anhydride Resins
• Effective Date: 01-Jun-2006
• Referred By: ASTM D3643-15(2022) - Standard Test Method for Acid Number of Certain Alkali-Soluble Resins
• Effective Date: 01-Sep-2004

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D 3644 – 98 (Reapproved 2004)
Standard Test Method for
Acid Number of Styrene-Maleic Anhydride Resins
This standard is issued under the fixed designation D 3644; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope where such specifications are available. Other grades may be
used, provided it is first ascertained that the reagent is of
1.1 This test method covers the measurement of the free
sufficiently high purity to permit its use without lessening the
acidity present in styrene-maleic anhydride resins.
accuracy of the determination.
1.2 This standard does not purport to address all of the
5.2 Purity of Water—Unless otherwise indicated, references
safety concerns, if any, associated with its use. It is the
to water shall be understood to mean reagent water conforming
responsibility of the user of this standard to establish appro-
to Specification D 1193.
priate safety and health practices and determine the applica-
5.3 Acetone, conforming to the requirements described in
bility of regulatory limitations prior to use.
Specification D 329.
2. Referenced Documents 5.4 Phenolphthalein Indicator Solution (20 g/L)—Dissolve
10 g of phenolphthalein in 100 mL of acetone.
2.1 ASTM Standards:
5.5 Sodium Hydroxide, Standard Solution (0.1 N)—
D 329 Specification for Acetone
Dissolve7gof sodium hydroxide (NaOH) in 7 mL of water,
D 1193 Specification for Reagent Water
and filter the resulting solution through an asbestos mat in a
3. Terminology
Gooch crucible with the aid of suction. Do not wash the
residue.Dilutetwothirdsoftheclearfiltrateto1Lwithfreshly
3.1 Definition:
boiled water. Standardize against National Institute of Stan-
3.1.1 acid number—the number of milligrams of potassium
dards and Technology standard sample of acid potassium
hydroxide (KOH) required to neutralize the alkali-reactive
phthalate No. 84, using phenolphthalein as the indicator. Do
groups in1gof material under the conditions of test.
not adjust the concentration of the solution, but calculate the
4. Significance and Use
normality.
5.6 Sulfuric Acid, Standard Solution (0.1 N)—Measure out
4.1 This test method is used to determine the property of
3mLofconcentratedsulfuricacid(H SO )(d = 1.84)andpour
styrene-maleic anhydride resins functionality.Acid functional-
2 4
it slowly, and with constant stirring, into about 100 mL of
ity determines the utility of resin as well as being a significant
water. Cool to room temperature, mix thoroughly, and dilute to
quality control test.
1 L. Standardize against 0.1 N NaOH solution, as prepared in
5. Reagents and Materials
4.5, using phenolphthalein as the indicator. Do not adjust the
concentration of the solution, but calculate the normality.
5.1 Purity of Reagents—Reagent grade chemicals shall be
used in all tests. Unless otherwise indicated, it is intended that
6. Procedure
all reagents shall conform to the specifications of the Commit-
6.1 Weigh 0.1 g of the sample to the nearest 0.0001 g into
tee onAnalytical Reagents of theAmerican Chemical Society,
a 250-mL Erlenmeyer flask.
6.2 Add 150 6 2 mL of acetone to the flask, stopper it, and
swirl it until the sample is dissolved. All 0.2 mL of phenol-
ThistestmethodisunderthejurisdictionofASTMCommitteeD21onPolishes
phthalein indicator solution and titrate with NaOH solution to
and is the direct responsibility
...