A new kind of amorphous molecular materials containing azobenzene chromophors has been synthesized.The precursor molecule was prepared by esterification between 1,3,5-benzenetricarbonyl chloride and N-ethyl-N-hydroxye...A new kind of amorphous molecular materials containing azobenzene chromophors has been synthesized.The precursor molecule was prepared by esterification between 1,3,5-benzenetricarbonyl chloride and N-ethyl-N-hydroxyethyl-aniline.The precursor molecule was then reacted with the diazonium salts of 5-aminoisophthalic acid to introduce donor-acceptor azobenzene chromophores at the peripheral groups.The azobenzene amorphous molecular material was characterized by the spectroscopic methods and thermal analysis.The azo compound synthesized can form stable amorphous glass.The amorphous molecular material was used to fabricate surface relief gratings(SRG) by exposing spin-coated thin films of the azo compound to an interference pattern of Ar^+ laser beams at modest intensity(120 mW/cm^2).The surface modulation was about 390 nm and the first order of diffraction efficiency was up to 23%.展开更多
文摘A new kind of amorphous molecular materials containing azobenzene chromophors has been synthesized.The precursor molecule was prepared by esterification between 1,3,5-benzenetricarbonyl chloride and N-ethyl-N-hydroxyethyl-aniline.The precursor molecule was then reacted with the diazonium salts of 5-aminoisophthalic acid to introduce donor-acceptor azobenzene chromophores at the peripheral groups.The azobenzene amorphous molecular material was characterized by the spectroscopic methods and thermal analysis.The azo compound synthesized can form stable amorphous glass.The amorphous molecular material was used to fabricate surface relief gratings(SRG) by exposing spin-coated thin films of the azo compound to an interference pattern of Ar^+ laser beams at modest intensity(120 mW/cm^2).The surface modulation was about 390 nm and the first order of diffraction efficiency was up to 23%.
文摘研究了一种新添加剂2-丁酮肟对一种混合烯丙基酚改性的双马树脂6421的固化特性和固化性能的影响.非等温DSC结果表明添加了2 wt%的2-丁酮肟后,体系的固化反应活化能从93.6 k J/mol下降为81.8k J/mol,固化放热峰值温度显著下降了约35 K,同温度固化后固化度显著提高.红外光谱分析表明添加剂可与双马来酰亚胺的双键发生反应,并且加速了双马来酰亚胺的双键和烯丙基酚的双键在固化过程中的反应,最终固化物具有类似结构.作为结果,少量2-丁酮肟的添加显著抑制了双马树脂的固化时结皮现象,固化物表面光滑,并可在160℃预固化后脱模进一步固化,具有潜在的低温固化高温使用前景,改性树脂在经原有固化工艺条件固化后,玻璃化转变温度提高了40 K.
