| Full text | |
| Author(s): |
Neumann‚ M.G.
;
Schmitt‚ C.C.
;
Catalina‚ F.
;
Goi‚ B.E.
Total Authors: 4
|
| Document type: | Journal article |
| Source: | Polymer Testing; v. 26, n. 2, p. 189-194, 2007. |
| Abstract | |
Copolymers of HEMA/HDDMA were obtained by photoinitiation in the presence of substituted thioxanthones and different amines, and the polymerization rates were measured by Fourier-transform infrared spectroscopy (FTIR). The swelling of films of these copolymers was determined by chloroform absorption. A good inverse relationship was found between the swelling and the polymerization rates. The production of more initiating radicals, which accelerate the polymerization processes, also induces a higher degree of crosslinking, conferring more rigidity to the polymer material and preventing larger solvent absorption and swelling. From the time evolution of the solvent uptake (n-values similar to 0.5) it can be deduced that the swelling process is controlled by the diffusion in the polymer network. (C) 2006 Elsevier Ltd. All rights reserved. (AU) | |
| FAPESP's process: | 03/07770-4 - Interactions of visible light with polymers: photopolymerization and photodegradation |
| Grantee: | MIGUEL GUILLERMO NEUMANN |
| Support Opportunities: | Research Projects - Thematic Grants |