| Autor: |
H. Nowack, C. Mühlhan, St. Weidner, Jörg F. Friedrich |
| Rok vydání: |
1999 |
| Předmět: |
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| Zdroj: |
Surface and Coatings Technology. :783-787 |
| ISSN: |
0257-8972 |
| Popis: |
Bonding of rapidly expanded polypropylene (PP) remains poor unless a special pretreatment of the PP substrate is performed. In the past mainly chemical primers were used. A replacement of this type of pretreatment by plasma pretreatment offers advantages from an environmental viewpoint. From the present investigations, where the plasma parameters were systematically varied, it can be concluded that a very short exposure to the plasma and new curing conditions led to the best results. The lap shear (bond) strength after plasma pretreatment became even higher than after a primer pretreatment. ESCA analyses and ultrasonic C-scan analyses of the fracture areas were performed. It was found that a long exposure to the plasma weakened the boundary layer. The C-scan analyses showed that the failure of the plasma pretreated bonds appears different from that at the primer pretreated specimens. Another important finding — especially from a practical viewpoint — was that the beneficial effect of the plasma pretreatment before bonding lasted in a laboratory environment much longer than after a primer pretreatment. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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