Contact angle characteristics and breaking strength of paint plastic film
✍ Scribed by Y. Tamai; S. Tanaka
- Publisher
- John Wiley and Sons
- Year
- 1967
- Tongue
- English
- Weight
- 686 KB
- Volume
- 11
- Category
- Article
- ISSN
- 0021-8995
No coin nor oath required. For personal study only.
✦ Synopsis
The advancing contact angle of water on plastic film coatings on metal was measured against both the air and the metal side surfaces after their being peeled off from the metal substrate. The plastic used was a methacrylate copolymer, and it was baked on cadmium, aluminum, nickel, iron, and gold. Contact angle for the air side was about 74" a t 25OC. for all metals, but the values on the metal side differed considerably, ranging from 76" for gold to 50" for cadmium. At the same time the static breaking strengths of the same films were investigated by applying a knife-edge vertically to the film with increasing load and measuring the weight a t which the elect,ric resistance through the film became zero. Increasing film thickness gave increasing strength, bttt, further thickening made the film weaker with a tendency for crack formation. The film-metal combinations of larger contact angle difference generally also showed the higher breaking strength.