以水稻秸秆液化产物为原料,以N,N,N,N,N-五甲基二乙烯三胺(P5)和N,N-二甲基环己胺(P8)为复合催化剂,制备了全水发泡聚氨酯泡沫(PUF)材料。通过调节水用量、催化剂比例、异氰酸酯指数及泡沫稳定剂用量,对不同条件下制备的泡沫性能进行测...以水稻秸秆液化产物为原料,以N,N,N,N,N-五甲基二乙烯三胺(P5)和N,N-二甲基环己胺(P8)为复合催化剂,制备了全水发泡聚氨酯泡沫(PUF)材料。通过调节水用量、催化剂比例、异氰酸酯指数及泡沫稳定剂用量,对不同条件下制备的泡沫性能进行测试,确定较优的制备工艺。利用万能试验机、热重分析仪(TGA)、傅里叶变换红外光谱仪(FT-IR)和扫描电子显微镜(SEM)对PUF的力学性能、热稳定性、结构和表观形貌进行了测试和表征。结果表明:当发泡剂水的用量为2%,催化剂P5/P8用量2%、催化剂P5/P8质量比值为1.5,异氰酸酯指数为1.2,硅油B8462用量为4%时,制得的聚氨酯泡沫性能最佳,密度为40 kg/m3、拉伸强度为309 k Pa、压缩强度为154 k Pa,其力学性能优于以有机锡和叔胺类化合物为催化剂制备的水稻秸秆PUF,且具有较好的热稳定性。展开更多
An oxidative amidation of tertiary amines with carboxylic acids has been developed in the presence of FeC13- 6H20 as catalyst and oxygen as oxidant. A variety of tertiary amides were obtained in good to excellent yiel...An oxidative amidation of tertiary amines with carboxylic acids has been developed in the presence of FeC13- 6H20 as catalyst and oxygen as oxidant. A variety of tertiary amides were obtained in good to excellent yields from inexpensive and readily available reagents. The possible reaction pathways were investigated.展开更多
Different from the conventional synthesis methods and substrates, we designed a brand new method for synthesizing amides with platinum nanowires as catalysts and tert-butylhydroperoxide(TBHP) as the oxidant. Influence...Different from the conventional synthesis methods and substrates, we designed a brand new method for synthesizing amides with platinum nanowires as catalysts and tert-butylhydroperoxide(TBHP) as the oxidant. Influence of factors, such as the catalyst, solvents, and the reaction temperature, were studied to determine the optimal reaction conditions. In addition, we explored the substrate generality and observed excellent yields.展开更多
文摘以水稻秸秆液化产物为原料,以N,N,N,N,N-五甲基二乙烯三胺(P5)和N,N-二甲基环己胺(P8)为复合催化剂,制备了全水发泡聚氨酯泡沫(PUF)材料。通过调节水用量、催化剂比例、异氰酸酯指数及泡沫稳定剂用量,对不同条件下制备的泡沫性能进行测试,确定较优的制备工艺。利用万能试验机、热重分析仪(TGA)、傅里叶变换红外光谱仪(FT-IR)和扫描电子显微镜(SEM)对PUF的力学性能、热稳定性、结构和表观形貌进行了测试和表征。结果表明:当发泡剂水的用量为2%,催化剂P5/P8用量2%、催化剂P5/P8质量比值为1.5,异氰酸酯指数为1.2,硅油B8462用量为4%时,制得的聚氨酯泡沫性能最佳,密度为40 kg/m3、拉伸强度为309 k Pa、压缩强度为154 k Pa,其力学性能优于以有机锡和叔胺类化合物为催化剂制备的水稻秸秆PUF,且具有较好的热稳定性。
基金financially supported by the Fundamental Research Funds for the Central Universitiesthe Research Funds of Renmin University of China(10XNL017)
文摘An oxidative amidation of tertiary amines with carboxylic acids has been developed in the presence of FeC13- 6H20 as catalyst and oxygen as oxidant. A variety of tertiary amides were obtained in good to excellent yields from inexpensive and readily available reagents. The possible reaction pathways were investigated.
基金supported by the National Natural Science Foundation of China (21373006, 51402203)the Priority Academic Program Development of Jiangsu Higher Education Institutions
文摘Different from the conventional synthesis methods and substrates, we designed a brand new method for synthesizing amides with platinum nanowires as catalysts and tert-butylhydroperoxide(TBHP) as the oxidant. Influence of factors, such as the catalyst, solvents, and the reaction temperature, were studied to determine the optimal reaction conditions. In addition, we explored the substrate generality and observed excellent yields.
