ASTM D5946-04
(Test Method)Standard Test Method for Corona-Treated Polymer Films Using Water Contact Angle Measurements
Standard Test Method for Corona-Treated Polymer Films Using Water Contact Angle Measurements
SCOPE
1.1 This test method covers measurement of the contact angle of water droplets on corona-treated polymer film surfaces.
Note 1—There is no similar or equivalent ISO standard.
1.2 The values stated in SI units are to be regarded as the standard. The values given in brackets 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 and health practices and determine the applicability of regulatory limitations prior to use.
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Designation:D5946–04
Standard Test Method for
Corona-Treated Polymer Films Using Water Contact Angle
1
Measurements
This standard is issued under the fixed designation D 5946; 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* procedures (Test Method D 724); or (2) by analyzing an image
of a droplet using various projection or reflective devices and
1.1 This test method covers measurement of the contact
measuring the height and width on the substrate surface to
angle of water droplets on corona-treated polymer film sur-
calculate the contact angle as follows:
faces.
u5 2 · arc tan ~H/R! (1)
NOTE 1—There is no similar or equivalent ISO standard.
where:
1.2 The values stated in SI units are to be regarded as the
u = contact angle,
standard.Thevaluesgiveninbracketsareforinformationonly.
H = height of a droplet’s image, and
1.3 This standard does not purport to address all of the
R = half its width.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
2. Referenced Documents
2
2.1 ASTM Standards:
D 618 Practice for Conditioning Plastics for Testing
D 724 TestMethodforSurfaceWettabilityofPaper(Angle-
of-Contact Method)
E 691 Practice for Conducting an Interlaboratory Study to
Determine the Precision of a Test Method
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 static contact angle, u (degrees), n—the angle be-
3.1.1.2 Discussion—Instrumentation is also available that
tween the substrate surface and the tangent line drawn to the
utilizes an image and directly determines the contact angle
droplet surface at the three-phase point, when a liquid drop is
based on the calculation shown for Method (2) of U.S. Patent
resting on a plane solid surface.
No. 5,268,733.
3.1.1.1 Discussion—Contact angle values can be deter-
3.1.1.3 Discussion—Method (1) may be biased due to the
mined as follows: (1) by analyzing an image of a droplet using
subjective nature of visually finding a tangent to the droplet
various projection or reflective devices and measuring the
image at the three-phase point; if Method (1) is to be used, the
contact angle directly with a protractor by using tangential
bias of each operator’s measurements shall be determined.
alignment of a cursor line or the use of reference alignment
Because Method (2) utilizes measured dimensions of the
droplet, it would be expected to have less bias. Comparative
1
This test method is under the jurisdiction ofASTM Committee D20 on Plastics
analyses using these various procedures have not been con-
and is the direct responsibility of Subcommittee D20.19 on Film and Sheeting.
ducted. Therefore, caution is recommended when comparing
Current edition approved February 1, 2004. Published March 2004. Originally
published as D 5946 – 96. Last previous edition D 5946 – 01. data obtained from these different methods.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
3.1.1.4 Discussion—Method (2) may not be applicable in
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
special cases in which the contact angle is greater than 90°
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D5946–04
4. Summary of Test Method film may affect the results. It is therefore important that the
portion of the film surface to be tested not be touched or
4.1 In this test method, drops of water are placed on the
rubbed, that all equipment be scrupulously clean, and that
surface of a film sample, and the contact angle values are
water purity be guarded carefully. Glass apparatus, in particu-
measured and then averaged.
lar, is likely to be contaminated with detergents having very
5. Significance and Use low surface tension, unless specific precautions are taken to
ensure their absence, such as cleaning with chromic sulfuric
5.1 The ability of polymer films to retain inks, coatings,
acid and rinsing with distilled water.
adhesives, etc. is primarily dependent on the character of their
surfaces and can be improved by one of several surface- 6.2 The presence of slip, antistatic, or antiblocking and
treating techniques. The electrical discharge treatment, such as other ad
...
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