A novel polyelectrolyte PNANT functionalized with electron donor-acceptor type azobenzene chromophores has been synthesized through post-polymerization azo coupling reaction and characterized by 1H-NMR,FTIR and UV-Vis...A novel polyelectrolyte PNANT functionalized with electron donor-acceptor type azobenzene chromophores has been synthesized through post-polymerization azo coupling reaction and characterized by 1H-NMR,FTIR and UV-Vis spectroscopy.The degree of functionalization (DF) of PNANT was 20% measured by elemental analysis.The degree of polymerization and its distribution were determined by GPC to be X n=251 with a polydispersion index 1.53.A glass transition temperature of 119℃ was observed from DSC thermogram. H-aggregation of azo chromophores of PNANT in spin-coated film and self-assembled film were detected from UV-Vis spectra,and the degree of H-aggregation of PNANT in the self-assembled film was found to be higher than that in the spin-coated film.Dichroism was optically induced in the spin-coated film and self-assembled film upon the irradiation of a polarized Ar + laser beam at 488 nm.The orientational order parameter obtained was 0.15 for spin-coated film and 0.07 for the self-assembled film.The resulting dichroism detected by UV-Vis spectra exhibited long-term stability.展开更多
针对矿用电机车铅酸蓄电池组智能充电器,比较了4种智能充电器方案的优缺点,提出了一种最有应用前途的智能充电器方案。这种智能充电器方案克服了传统"变压器加可控硅移相调压"井下铅酸蓄电池组充电器方案的诸多缺点,具有体积...针对矿用电机车铅酸蓄电池组智能充电器,比较了4种智能充电器方案的优缺点,提出了一种最有应用前途的智能充电器方案。这种智能充电器方案克服了传统"变压器加可控硅移相调压"井下铅酸蓄电池组充电器方案的诸多缺点,具有体积小、质量小、电压调节方便、起动电流小、动态响应快、智能化程度高等优点。新型智能充电器由H桥IG B T功率变换单元组成,采用移相P W M技术,经过电压变换环节,实现了从输入三相A C 380 V/A C 660 V到直流D C 0 V^D C 300 V的变换。该智能充电器方案技术先进、性能指标优越,可以在煤矿行业内推广应用。展开更多
文摘A novel polyelectrolyte PNANT functionalized with electron donor-acceptor type azobenzene chromophores has been synthesized through post-polymerization azo coupling reaction and characterized by 1H-NMR,FTIR and UV-Vis spectroscopy.The degree of functionalization (DF) of PNANT was 20% measured by elemental analysis.The degree of polymerization and its distribution were determined by GPC to be X n=251 with a polydispersion index 1.53.A glass transition temperature of 119℃ was observed from DSC thermogram. H-aggregation of azo chromophores of PNANT in spin-coated film and self-assembled film were detected from UV-Vis spectra,and the degree of H-aggregation of PNANT in the self-assembled film was found to be higher than that in the spin-coated film.Dichroism was optically induced in the spin-coated film and self-assembled film upon the irradiation of a polarized Ar + laser beam at 488 nm.The orientational order parameter obtained was 0.15 for spin-coated film and 0.07 for the self-assembled film.The resulting dichroism detected by UV-Vis spectra exhibited long-term stability.
文摘针对矿用电机车铅酸蓄电池组智能充电器,比较了4种智能充电器方案的优缺点,提出了一种最有应用前途的智能充电器方案。这种智能充电器方案克服了传统"变压器加可控硅移相调压"井下铅酸蓄电池组充电器方案的诸多缺点,具有体积小、质量小、电压调节方便、起动电流小、动态响应快、智能化程度高等优点。新型智能充电器由H桥IG B T功率变换单元组成,采用移相P W M技术,经过电压变换环节,实现了从输入三相A C 380 V/A C 660 V到直流D C 0 V^D C 300 V的变换。该智能充电器方案技术先进、性能指标优越,可以在煤矿行业内推广应用。
