Surface rearrangement of vinyl acetate and acrylate terpolymer adhesives investigated by dynamic contact angles
✍ Scribed by Xu, Mei Xuan; Liu, Wen Guang; Wang, Jun; Gao, Wei; De Yao, Kang
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- English
- Weight
- 304 KB
- Volume
- 44
- Category
- Article
- ISSN
- 0959-8103
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✦ Synopsis
Terpolymer solution-based adhesives of vinyl acetate and acrylates with di †erent long alkyl side chains were prepared by radical polymerization. Dynamic contact angles of the adhesives-coated Ðlms measured by the Wilhelmy plate technique indicated that the reorientation of the adhesive surface varied with the length of the alkyl side chain. It was found that the changes of advancing contact angles and receding contact angles were relatively great (h a ) ( h r ) within the range of lower immersion speeds at various temperatures, but approaching a certain velocity the contact angles became stable. The lower activation energies of the change in contact angles revealed that the rearrangement of surface groups can be achieved by small-scale secondary transitions. In addition, the activation energies required for rearrangement from apolar to polar medium and the reverse process were di †erent.