ASTM D3644-06
(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
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.
SCOPE
1.1 This test method covers the measurement of the free acidity present in styrene-maleic anhydride resins.
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.
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Standards Content (Sample)
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Designation: D3644 − 06
StandardTest Method for
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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.
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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 D1193.
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 D329.
5.4 Phenolphthalein Indicator Solution (20 g/L)—Dissolve
2. Referenced Documents
10 g of phenolphthalein in 100 mL of acetone.
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2.1 ASTM Standards:
5.5 Sodium Hydroxide, Standard Solution (0.1 N)—
D329 Specification for Acetone
Dissolve7gof sodium hydroxide (NaOH) in 7 mL of water,
D1193 Specification for Reagent Water
and filter the resulting solution through a glass mat in a Gooch
crucible with the aid of suction. Do not wash the residue.
3. Terminology
Dilute two thirds of the clear filtrate to 1 L with freshly boiled
3.1 Definitions:
water. Standardize against National Institute of Standards and
3.1.1 acid number—the number of milligrams of potassium Technology standard sample of acid potassium phthalate No.
hydroxide (KOH) required to neutralize the alkali-reactive
84, using phenolphthalein as the indicator. Do not adjust the
groups in1gof material under the conditions of test. concentration of the solution, but calculate the normality.
5.6 Sulfuric Acid, Standard Solution (0.1 N)—Measure out
4. Significance and Use
3mLofconcentratedsulfuricacid(H SO )(d = 1.84)andpour
2 4
it slowly, and with constant stirring, into about 100 mL of
4.1 This test method is used to determine the property of
water. Cool to room temperature, mix thoroughly, and dilute to
styrene-maleic anhydride resins functionality.Acid functional-
1 L. Standardize against 0.1 N NaOH solution, as prepared in
ity determines the utility of resin as well as being a significant
4.5, using phenolphthalein as the indicator. Do not adjust the
quality control test.
concentration of the solution, but calculate the normality.
5. Reagents and Materials
6. Procedure
5.1 Purity of Reagents—Reagent grade chemicals shall be
6.1 Weigh 0.1 g of the sample to the nearest 0.0001 g into
used in all tests. Unless otherwise indicated, it is intended that
a 250-mL Erlenmeyer flask.
all reagents shall conform to the specifications of the Commit-
6.2 Add 150 6 2 mL of acetone to the flask, stopper it, and
tee onAnalytical Reagents of theAmerican Chemical Society,
swirl it until the sample is dissolved. All 0.2 mL of phenol-
phthalein indicator solution and titrate with NaOH solution to
the end point, a faint pink color which persists for 30 s. Then
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ThistestmethodisunderthejurisdictionofASTMCommitteeD21onPolishes
and is the direct responsibility of Subcommittee D21.02 on Raw Materials.
Current edition approved June 1, 2006. Published June 2006. Originally
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approved in 1983. Last previous edition approved in 2004 as D3644 – 98(2004). Reagent Chemicals, American Chemical Society Specifications, American
DOI: 10.1520/D3644-06. Chemical Society, Washington, DC. For suggestions on the testing of reagents not
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or listed by the American Chemical Society, see Analar Standards for Laboratory
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia
Standards volume information, refer to the standard’s Document Summary page on and National Formulary, U.S. Pharmacopeial Convention, Inc. (USPC), Rockville,
the ASTM website. MD.
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D3644 − 06
add 2.0 mLof additional NaOH solution, stopper the flask, and
N = normality of H SO ,
A 2 4
allow it to stand for exactly 10 min.
V = millilitres of NaOH solution,
B
N = normal
...
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