Miscibility, UV resistance, thermal degradation, and mechanical properties of PMMA/SAN blends and their composites with MWCNTs
| Autor: | Jyotishkumar Parameswaranpillai, Seno Jose, Nishar Hameed, George Joseph, Sisanth Krishnan Sidhardhan |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Polymers and Plastics 02 engineering and technology General Chemistry Carbon nanotube 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Miscibility 0104 chemical sciences Surfaces Coatings and Films law.invention chemistry.chemical_compound chemistry law Materials Chemistry Copolymer Thermal stability Polystyrene Polymer blend Fourier transform infrared spectroscopy Acrylonitrile Composite material 0210 nano-technology |
| Zdroj: | Journal of Applied Polymer Science. 133 |
| ISSN: | 0021-8995 |
| DOI: | 10.1002/app.43628 |
| Popis: | Poly(methyl methacrylate)/poly(styrene-co-acrylonitrile) (PMMA/SAN) blends, with varying concentrations, were prepared by melt-mixing technique. The miscibility is ensured by fixing the acrylonitrile (AN) content of styrene acrylonitrile (SAN) as 25% by weight. The blends were transparent as well. The Fourier transform infrared spectroscopic (FTIR) studies did not reveal any specific interactions, supporting the well accepted 'copolymer repulsion effect' as the driving mechanism for miscibility. Addition of SAN increased the stability of PMMA towards ultraviolet (UV) radiations and thermal degradation. Incorporation of even 0.05% by weight of multi-walled carbon nanotubes (MWCNTs) significantly improved the UV absorbance and thermal stability. Moreover, the composites exhibited good strength and modulus. However, at higher concentrations of MWCNTs (0.5 and 1% by weight) the thermo-mechanical properties experienced deterioration, mainly due to the agglomeration of MWCNTs. It was observed that composites with 0.05% by weight of finely dispersed and well distributed MWCNTs provided excellent protection in most extreme climatic conditions. Thus, PMMA/SAN/MWCNTs composites can act as excellent light screens and may be useful, as cost-effective UV absorbers, in the outdoor applications. |
| Databáze: | OpenAIRE |
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