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Standard Test Method for Corona-Treated Polymer Films Using Water Contact Angle Measurements
Automaticky přeložený název:
Standardní zkušební metoda pro Corona zpracované polymerních filmů s použitím vody kontaktní úhel měření
NORMA vydána dne 1.4.2009
Označení normy: ASTM D5946-09
Poznámka: NEPLATNÁ
Datum vydání normy: 1.4.2009
Kód zboží: NS-33144
Počet stran: 7
Přibližná hmotnost: 21 g (0.05 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
Keywords:
contact angle, contact angle meter, corona treatment, goniometer, polymer films, surface treatment, water, Contact angle, Corona treatment, Goniometer, Polymer films, Surface treatments, Water analysis--plastics processing, Water droplets, Wetting tension, ICS Number Code 83.020 (Manufacturing processes in the rubber and plastics industries)
Significance and Use | ||||||||||
The ability of polymer films to retain inks, coatings, adhesives, etc. is primarily dependent on the character of their surfaces and can be improved by one of several surface-treating techniques. The electrical discharge treatment, such as corona treatment, has been found to increase the wetting tension of a polymer film. The stronger the treatment, the more actively the surface reacts with different polar interfaces. It is therefore possible to relate the contact angle of a polymer film surface to its ability to accept and retain inks, coatings, adhesives, etc., if the ink, coating, or adhesive contains the polar functionalities. Contact angle in itself is not a completely acceptable measure of ink, coating, or adhesive adhesion. The wetting tension of a polymer film belongs to a group of physical parameters for which no standard of accuracy exists. The wetting tension of a polymer cannot be measured directly because solids do not change shape measurably in reaction to surface energy. Many indirect methods have been proposed. Different test methods tend to produce different results on identical samples. Practical determination of a solid's surface energy uses this interaction of the solid with test liquids. Although the level of surface treatment of polymer films has been traditionally defined in the industry in terms of dynes/cm (mN/m), these values are derived from a subjective interpretation of the observed test liquid behavior. The following ranges of water contact
angle values can be used as a guide for defining the level of
surface treatment of polyolefins and many other polymer films with
initial low surface energies:
The suitability of the test for specification acceptance, manufacturing control, and end use of polymer films will have to be established through capability studies for each particular film and treatment. Almost all materials have variations in contact angle as one moves from point to point. Nonuniform treatment of film with corona treaters may also add variability to the results. Therefore, multiple measurements are necessary to reflect variation in treatment and surface roughness. |
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1. Scope | ||||||||||
1.1 This test method covers measurement of the contact angle of water droplets on corona-treated polymer film surfaces. Note 1—This test method is identical to ISO 15989. 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 and health practices and determine the applicability of regulatory limitations prior to use. |
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2. Referenced Documents | ||||||||||
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