Polymethylmethacrylat-graft-polybisphenol A-carbonate （PMMA-G-PC） with 50% grafting is synthesized. The graft co-polymerization of methyhnethacrylate （0.036 mol. lit-1） onto polybisphenol-A-carbonate （0.5 g） in ...Polymethylmethacrylat-graft-polybisphenol A-carbonate （PMMA-G-PC） with 50% grafting is synthesized. The graft co-polymerization of methyhnethacrylate （0.036 mol. lit-1） onto polybisphenol-A-carbonate （0.5 g） in the presence of a redox couple formed from potassium persulphate （40 mol-lit-1） and thio-urea （30 mmol. lit-1） in aqueous nitric acid （0.18 M, 100 ml） in air at （45±2）℃ for 3.0 h. Condensation of （PMMA-G-PC） with N- [p-（carboxyl phenyl amino acetic acid）] hydrazide （PCPH） affords polybisphenol-A-carbonate-graft-polymethylmethacrylate hydrazide （PCGH）. The photoacoustic （PA） spectra of （PCGH） are recorded in a wavelength range from 200 nm to 800 nm at a modulation frequency of 22 Hz, and compared with those of pure polybisphenol-A-carbonate （PC）, （PMMA-G-PC） and （PCPH）. In the present work, a non-destructive and non-contact analytical method, namely the photoacoustic technique, is successfully implemented for optical and thermal characterization of selected polymeric materials. The indigenous PA spectrometer used in the present study consists of a 300-W xenon arc lamp, a lock-in amplifier, a chopper, a （1/8）-m monochromator controlled by computer and a home-made PA cell.展开更多
文摘Polymethylmethacrylat-graft-polybisphenol A-carbonate （PMMA-G-PC） with 50% grafting is synthesized. The graft co-polymerization of methyhnethacrylate （0.036 mol. lit-1） onto polybisphenol-A-carbonate （0.5 g） in the presence of a redox couple formed from potassium persulphate （40 mol-lit-1） and thio-urea （30 mmol. lit-1） in aqueous nitric acid （0.18 M, 100 ml） in air at （45±2）℃ for 3.0 h. Condensation of （PMMA-G-PC） with N- [p-（carboxyl phenyl amino acetic acid）] hydrazide （PCPH） affords polybisphenol-A-carbonate-graft-polymethylmethacrylate hydrazide （PCGH）. The photoacoustic （PA） spectra of （PCGH） are recorded in a wavelength range from 200 nm to 800 nm at a modulation frequency of 22 Hz, and compared with those of pure polybisphenol-A-carbonate （PC）, （PMMA-G-PC） and （PCPH）. In the present work, a non-destructive and non-contact analytical method, namely the photoacoustic technique, is successfully implemented for optical and thermal characterization of selected polymeric materials. The indigenous PA spectrometer used in the present study consists of a 300-W xenon arc lamp, a lock-in amplifier, a chopper, a （1/8）-m monochromator controlled by computer and a home-made PA cell.
