采用Yamazaki聚合体系,以9,9-二[4-(4-羧基苯氧基)苯基]呫吨(BCPX)为第三单体,将其与对苯二甲酸(PTA)、对苯二胺(PPD)进行共缩聚反应,合成了一系列含呫吨结构的聚酰胺共聚物.研究了单体摩尔浓度、反应温度、BCPX和PTA摩尔比等对共聚反...采用Yamazaki聚合体系,以9,9-二[4-(4-羧基苯氧基)苯基]呫吨(BCPX)为第三单体,将其与对苯二甲酸(PTA)、对苯二胺(PPD)进行共缩聚反应,合成了一系列含呫吨结构的聚酰胺共聚物.研究了单体摩尔浓度、反应温度、BCPX和PTA摩尔比等对共聚反应的影响,并用IR、DSC、TGA等方法对共聚物进行了表征.结果表明,新型聚芳酰胺的对数比浓粘度为1.90~2.95 d L·g^(-1),具有较高的玻璃化温度(Tg=297.3~320.5℃),在氮气氛中5%热失重温度为522~540℃,800℃时的残炭率在51%以上.随着单体BCPX和PTA摩尔比的增加,共聚物的Tg逐渐降低,当BCPX和PTA摩尔比大于50/50时,共聚酰胺在常温下可溶于N-甲基-2-吡咯烷酮、N,N-二甲基乙酰胺、吡啶等极性有机溶剂中.展开更多
Heterogeneous molecular catalysts,such as metal phthalocyanines,are efficient electrocatalysts for CO_(2) reduction reaction(CO_(2)RR).However,the rational design and synthesis of a molecular catalyst-based heterostru...Heterogeneous molecular catalysts,such as metal phthalocyanines,are efficient electrocatalysts for CO_(2) reduction reaction(CO_(2)RR).However,the rational design and synthesis of a molecular catalyst-based heterostructure for CO_(2)RR remains challenging.Herein,we developed a crystalline bimetallic phthalocyanine heterostructure electrocatalyst(CoPc/FePc HS),which achieved an excellent CO_(2)-to-CO conversion efficiency(99%)and outstanding long-term stability after 10 h of electrocatalysis.Density functional theory calculations revealed that the enhancement of CO_(2)RR performance could be attributed to the distinct electron transfer pattern between FePc and CoPc.The heterostructural engineering in molecular catalysts would inspire a unique approach for improving CO_(2)RR performance.展开更多
文摘采用Yamazaki聚合体系,以9,9-二[4-(4-羧基苯氧基)苯基]呫吨(BCPX)为第三单体,将其与对苯二甲酸(PTA)、对苯二胺(PPD)进行共缩聚反应,合成了一系列含呫吨结构的聚酰胺共聚物.研究了单体摩尔浓度、反应温度、BCPX和PTA摩尔比等对共聚反应的影响,并用IR、DSC、TGA等方法对共聚物进行了表征.结果表明,新型聚芳酰胺的对数比浓粘度为1.90~2.95 d L·g^(-1),具有较高的玻璃化温度(Tg=297.3~320.5℃),在氮气氛中5%热失重温度为522~540℃,800℃时的残炭率在51%以上.随着单体BCPX和PTA摩尔比的增加,共聚物的Tg逐渐降低,当BCPX和PTA摩尔比大于50/50时,共聚酰胺在常温下可溶于N-甲基-2-吡咯烷酮、N,N-二甲基乙酰胺、吡啶等极性有机溶剂中.
基金supported by the National Natural Science Foundation of China(22071172,91833306,21875158,51633006,and 51733004).
文摘Heterogeneous molecular catalysts,such as metal phthalocyanines,are efficient electrocatalysts for CO_(2) reduction reaction(CO_(2)RR).However,the rational design and synthesis of a molecular catalyst-based heterostructure for CO_(2)RR remains challenging.Herein,we developed a crystalline bimetallic phthalocyanine heterostructure electrocatalyst(CoPc/FePc HS),which achieved an excellent CO_(2)-to-CO conversion efficiency(99%)and outstanding long-term stability after 10 h of electrocatalysis.Density functional theory calculations revealed that the enhancement of CO_(2)RR performance could be attributed to the distinct electron transfer pattern between FePc and CoPc.The heterostructural engineering in molecular catalysts would inspire a unique approach for improving CO_(2)RR performance.
