| Full text | |
| Author(s): |
Total Authors: 3
|
| Affiliation: | [1] Universidade de São Paulo. Escola de Engenharia de São Carlos. Departamento de Engenharia de Materiais - Brasil
[2] Universidade de São Paulo. Instituto de Química de São Carlos - Brasil
[3] Universidade de São Paulo. Instituto de Química de São Carlos - Brasil
Total Affiliations: 3
|
| Document type: | Journal article |
| Source: | POLIMEROS-CIENCIA E TECNOLOGIA; v. 25, n. 1, p. 101-108, 2015-02-00. |
| Abstract | |
Poly(ethylene oxide) (PEO) with SWy-1 montmorillonite and stabilizers (2-hydroxybenzophenone and tinuvin 770) composites were prepared by intercalation in solution method. The films of the composites were exposed to UV irradiation. The photodegradation products were monitored by FTIR (Fourier Transform Infrared Spectroscopy) and SEC (Size Exclusion Chromatography) method. The PEO pure showed higher degradation rate coefficients, kd , compared to the others samples. The system that showed the lowest value for the degradation rate coefficients (kd = 1.9×10–6 mol g –1 h –1) was the PEO/SWy-1 5% composite with 0.25% of tinuvin 770. In this case, the stabilization of the PEO matrix can be attributed to clay associated with tinuvin 770. The clay scatters and absorbs UV irradiation and tinuvin acts as a stabilizer of the HALS (hindered amine light stabilizers) kind. (AU) | |
| FAPESP's process: | 09/15998-1 - UV/visible light interactions with polymer-clay composites: photopolymerization and photodegradation |
| Grantee: | Carla Cristina Schmitt Cavalheiro |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 12/19656-0 - Photoinitiation of polymerization and degradation of polymers multicomponent |
| Grantee: | Carla Cristina Schmitt Cavalheiro |
| Support Opportunities: | Regular Research Grants |