A series of model polymerization are carried out via the one-pot externally initiated Kumada catalyst-transfer polycondensation （KCTP） of 2-bromo-5-chloromagne- slum thiophene monomers, and the excess amount of init...A series of model polymerization are carried out via the one-pot externally initiated Kumada catalyst-transfer polycondensation （KCTP） of 2-bromo-5-chloromagne- slum thiophene monomers, and the excess amount of initiators or catalysts are found no need to be isolated during the polycondensation process. Especially, the impacts of the nickel catalyst loading variation on regioregularity （rr）, yield, molecular weight （Mn）, polydispersity （PDI） and initiation efficiency of poly（3-hexylthiophene） （P3HT） are systematically investigated. The IH NMR, size-exclusion chromatography （SEC）, and MALDI-TOF mass spectroscopy results indicated that an excess amount of catalyst does not influence yield, rr, Mn, and PDI of P3HT, nor the initiation efficiency. However, the PDI of the product is broad, and the Mn and rr values decreased in the absence of 1,3-bis （diphenylphosphino）propane （dppp）. It can be concluded that the in-situ KCTP polymerization of P3HT is a practical and effective process. These results are especially valuable for the synthesis of all-conjugated block copolymers where macroinitiators are used.展开更多
CO_(2)大量排放引发的温室效应已成为全球性气候问题,碳减排工作势在必行。碳捕集、利用与封存(carbon capture,utilization and storage,CCUS)技术是降低碳排放的关键技术之一,但碳捕集工艺中有机胺吸收液再生解吸CO_(2)环节能源消耗严...CO_(2)大量排放引发的温室效应已成为全球性气候问题,碳减排工作势在必行。碳捕集、利用与封存(carbon capture,utilization and storage,CCUS)技术是降低碳排放的关键技术之一,但碳捕集工艺中有机胺吸收液再生解吸CO_(2)环节能源消耗严重,限制了其进一步的应用。如何降低其解吸再生能耗是当前研究的重要方向,其中引入催化剂实现再生能耗降低已成为研究热点。本文基于CO_(2)捕集工艺中解吸过程高能耗的现状,首先分析了解吸过程高能耗的来源和关键能耗因素,并针对这些关键因素提出了相关的改进策略,以此论证使用固体酸催化剂降低能耗的可行性。在此基础上,对目前在研的各类固体酸催化剂进行了介绍和总结,为低能耗CO_(2)解吸固体酸催化剂的研发提供技术参考。展开更多
文摘A series of model polymerization are carried out via the one-pot externally initiated Kumada catalyst-transfer polycondensation （KCTP） of 2-bromo-5-chloromagne- slum thiophene monomers, and the excess amount of initiators or catalysts are found no need to be isolated during the polycondensation process. Especially, the impacts of the nickel catalyst loading variation on regioregularity （rr）, yield, molecular weight （Mn）, polydispersity （PDI） and initiation efficiency of poly（3-hexylthiophene） （P3HT） are systematically investigated. The IH NMR, size-exclusion chromatography （SEC）, and MALDI-TOF mass spectroscopy results indicated that an excess amount of catalyst does not influence yield, rr, Mn, and PDI of P3HT, nor the initiation efficiency. However, the PDI of the product is broad, and the Mn and rr values decreased in the absence of 1,3-bis （diphenylphosphino）propane （dppp）. It can be concluded that the in-situ KCTP polymerization of P3HT is a practical and effective process. These results are especially valuable for the synthesis of all-conjugated block copolymers where macroinitiators are used.
文摘CO_(2)大量排放引发的温室效应已成为全球性气候问题,碳减排工作势在必行。碳捕集、利用与封存(carbon capture,utilization and storage,CCUS)技术是降低碳排放的关键技术之一,但碳捕集工艺中有机胺吸收液再生解吸CO_(2)环节能源消耗严重,限制了其进一步的应用。如何降低其解吸再生能耗是当前研究的重要方向,其中引入催化剂实现再生能耗降低已成为研究热点。本文基于CO_(2)捕集工艺中解吸过程高能耗的现状,首先分析了解吸过程高能耗的来源和关键能耗因素,并针对这些关键因素提出了相关的改进策略,以此论证使用固体酸催化剂降低能耗的可行性。在此基础上,对目前在研的各类固体酸催化剂进行了介绍和总结,为低能耗CO_(2)解吸固体酸催化剂的研发提供技术参考。
