Nitrophenyl ferulate was synthesized in one step without the protection of the hydroxyl of ferulic acid in the presence of 1,3 dicyclohexylcarbodiimide(DCC) as the catalyst. Thus, 15 20 g of ferulic acid reacted with ...Nitrophenyl ferulate was synthesized in one step without the protection of the hydroxyl of ferulic acid in the presence of 1,3 dicyclohexylcarbodiimide(DCC) as the catalyst. Thus, 15 20 g of ferulic acid reacted with 18 07 g of 4 nitrophenol for 24 h at room temperature in the presence of 22 44 g of DCC. The crude product was recrystallized from CHCl 3 to give 16 00 g of 4 nitrophenyl ferulate and the yield was 82 5%. Elemental analysis, IR and 1H NMR techniques were used to prove the structure of the product.展开更多
目的:探索水、乙醇、丙酮作选择溶剂时,碳二亚胺(carbodiimide,EDC)对丙酮基酸蚀冲洗粘接系统粘接性能的影响。方法:选择64颗离体第三磨牙,按照预处理剂种类及是否老化,随机分为8组(n=8),S0、S0a:去离子水;S、Sa:EDC水溶液;E、Ea:EDC乙...目的:探索水、乙醇、丙酮作选择溶剂时,碳二亚胺(carbodiimide,EDC)对丙酮基酸蚀冲洗粘接系统粘接性能的影响。方法:选择64颗离体第三磨牙,按照预处理剂种类及是否老化,随机分为8组(n=8),S0、S0a:去离子水;S、Sa:EDC水溶液;E、Ea:EDC乙醇溶液;B、Ba:EDC丙酮溶液。预处理后,采用Prime Bond NT完成粘接试件制备。S0、S、E、B为即刻组,S0a、Sa、Ea、Ba组进行冷热循环5000次老化处理。每组随机选取6个试件,测定剪切强度,观察断裂模式,剩余2个试件在SEM下观察粘接界面微观形貌。采用SPSS 20.0软件包对剪切强度进行统计学处理。结果:S组剪切强度大于S0组,Sa组大于S0a,差异有统计学意义(P<0.05),S、E、B组之间差异无统计学意义(P>0.05)。Sa、Ea、Ba组剪切强度依次增大,差异有统计学意义(P<0.05)。EDC、老化、溶剂单独主效应有统计学意义(P<0.05),EDC和老化之间有交互效应(P<0.05)。即刻组断裂模式以混合破坏为主,老化组以界面断裂为主。SEM下观察即刻组混合层均匀完整,S0a组裂纹最大,Ba组仅少量裂纹。结论:水、乙醇和丙酮作溶剂的EDC预处理,可提高丙酮基酸蚀冲洗粘接系统即刻和老化后粘接强度;丙酮作溶剂时,可最大限度地提高老化后粘接强度。展开更多
文摘Nitrophenyl ferulate was synthesized in one step without the protection of the hydroxyl of ferulic acid in the presence of 1,3 dicyclohexylcarbodiimide(DCC) as the catalyst. Thus, 15 20 g of ferulic acid reacted with 18 07 g of 4 nitrophenol for 24 h at room temperature in the presence of 22 44 g of DCC. The crude product was recrystallized from CHCl 3 to give 16 00 g of 4 nitrophenyl ferulate and the yield was 82 5%. Elemental analysis, IR and 1H NMR techniques were used to prove the structure of the product.
文摘目的:探索水、乙醇、丙酮作选择溶剂时,碳二亚胺(carbodiimide,EDC)对丙酮基酸蚀冲洗粘接系统粘接性能的影响。方法:选择64颗离体第三磨牙,按照预处理剂种类及是否老化,随机分为8组(n=8),S0、S0a:去离子水;S、Sa:EDC水溶液;E、Ea:EDC乙醇溶液;B、Ba:EDC丙酮溶液。预处理后,采用Prime Bond NT完成粘接试件制备。S0、S、E、B为即刻组,S0a、Sa、Ea、Ba组进行冷热循环5000次老化处理。每组随机选取6个试件,测定剪切强度,观察断裂模式,剩余2个试件在SEM下观察粘接界面微观形貌。采用SPSS 20.0软件包对剪切强度进行统计学处理。结果:S组剪切强度大于S0组,Sa组大于S0a,差异有统计学意义(P<0.05),S、E、B组之间差异无统计学意义(P>0.05)。Sa、Ea、Ba组剪切强度依次增大,差异有统计学意义(P<0.05)。EDC、老化、溶剂单独主效应有统计学意义(P<0.05),EDC和老化之间有交互效应(P<0.05)。即刻组断裂模式以混合破坏为主,老化组以界面断裂为主。SEM下观察即刻组混合层均匀完整,S0a组裂纹最大,Ba组仅少量裂纹。结论:水、乙醇和丙酮作溶剂的EDC预处理,可提高丙酮基酸蚀冲洗粘接系统即刻和老化后粘接强度;丙酮作溶剂时,可最大限度地提高老化后粘接强度。
