Journal
EXPRESS POLYMER LETTERS
Volume 4, Issue 9, Pages 539-550Publisher
BUDAPEST UNIV TECHNOL & ECON
DOI: 10.3144/expresspolymlett.2010.68
Keywords
coatings; flame retardancy; polyurethane acrylate; thermal properties
Categories
Funding
- Program for Specialized Research Fund for the Doctoral Program of Higher Education [200803580008]
- Program for Science and Technology of SuZhou [SG-0841]
- University of Science and Technology of China
- State Key Laboratory of Environmental Adaptability for Industrial Products
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A new UV-reactive monomer piperazine-N,N'-bis(acryloxyethylaryl-phosphoramidate) (N-PBAAP) containing phosphorus and nitrogen was synthesized and used as flame retardant for an ether-type UV-cured polyurethane acrylate (PUA) coating. The thermal properties of the PUA films were investigated by thermogravimetric analysis (TGA) in air and nitrogen atmosphere. The TGA results showed that the incorporation of N-PBAAP can obviously enhance the char residue of the PUA coatings. From the TGA and real time Fourier transformed infrared spectroscopy (RT-FTIR) results, different degradation behaviors were observed in the PUA coatings with different N-PBAAP content. The combustibility of the PUA coatings was evaluated by microscale combustion calorimeter (MCC). The MCC results revealed that the addition of N-PBAAP in the coatings can significantly reduce the peak Heat Release Rate (pHRR), Heat Release Capacity (HRC) and the Total Heat Release (THR) of the samples. Furthermore, dynamical mechanical thermal analysis (DMA) was employed to examine the viscoelastic properties of the PUA films. It was found that the incorporation of N-PBAAP in the formulation can bring in more functional groups to the coatings, which results in an increase of the glass transition temperature (T-g) and cross linking density (XLD) of the films.
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