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The thermal degradation of phenol–formaldehyde resins (PFR) was studied using thermogravimetry analysis (TG) technique. The structural changes of thermal degradation of synthetical and commercial PFR were investigated by Fourier-transform infrared rays (FTIR) and solid-state 13 C nuclear magnetic resonance ( 13 C NMR) spectroscopy. The experimental results show that the degradation...
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