共查询到20条相似文献,搜索用时 62 毫秒
1.
2.
3.
4.
5.
《物理化学学报》2020,(5)
聚碳酸酯具有较高的介电常数和较强极性的碳酸酯基团,是一类高性能的聚合物固态电解质,但是它在全固态钠离子电池体系中的研究非常少。本文以简便的方法成功制备出了聚碳酸丙烯酯基全固态聚合物电解质,并研究了该全固态电解质在以3,4,9,10-苝四甲酸二酐为正极的有机全固态钠电池中的应用。这种全固态聚合物电解质在钠离子电池中的应用能够有效提高钠离子电池的安全性,防止过充、电解液泄露甚至爆炸等一系列不安全因素带来的隐患。结果表明:这种聚碳酸丙烯酯基全固态聚合物电解质在室温下具有较高的电导率,并且循环前后的阻抗测试说明了该电解质与有机正极具有良好的兼容性。取代了传统液体有机电解液后,该全固态钠电池在室温下展示出了优异的循环性能,循环50周后,容量保持率为99.1%;然而,同类型的液体电池遭受了严重的容量衰减,循环50周后容量只有24.6 m Ah·g~(-1),容量保持率仅为20.5%。 相似文献
6.
7.
聚甲基丙烯酸甲酯具有无色透明,机械强度好的优点,工业上大量采用它,尤其航空工业的发展需要的数量大大地增加了,但它只能耐80—90℃(马尔丁斯法)是它的缺点。我们用甲基丙烯酸丙烯酯与其共聚,企图提高我厂出品的聚甲墓丙烯酸甲酯的软化温度。 苏联指出:甲基丙烯酸丙烯酯可以提高聚甲基丙烯酸甲酯的耐温度。我们采用他的方法,直接用甲基丙烯酸与丙烯醇酯化得到甲基丙烯酸丙烯酯。如下式表示: 相似文献
8.
9.
为了制备聚合物/碳纳米管复合物,采用聚碳酸酯修饰了多壁碳纳米管。选择聚碳酸环氧丙烷己内酯,聚碳酸亚丁酯己内酯和聚碳酸亚丙酯马来酸酐酯三种聚碳酸酯修饰多壁碳纳米管,仅仅碳酸环氧丙烷己内酯修饰的碳纳米管复合物可分离得到可溶解性产物。分别采用红外光谱、扫描电镜和透射电镜表征了碳纳米管的表面修饰基团及形貌。热重分析表明,可溶解聚碳酸环氧丙烷己内酯修饰多壁碳纳米管相对接枝了较多的聚合物,因此促进了碳纳米管的溶解性,可能是因为聚碳酸环氧丙烷己内酯具有较多的端羟基提高了修饰接枝效果。可溶解聚碳酸环氧丙烷己内酯修饰多壁碳纳米管接枝了生物活性的部分,并具有一定溶解性,在药物载体领域将具有潜在用途。 相似文献
10.
脂肪酸丙烯醇酯的合成 总被引:4,自引:0,他引:4
用乙酸、丙酸、丁酸、戊酸、己酸分别与丙烯醇在加热下通过无水硫酸铜,进行反应,得到了乙酸丙烯酯、丙酸丙烯酯、丁酸丙烯酯、戊酸丙烯酯、己酸丙烯酯,其产率分别为60%,75%,74.2%,70%,72%. 相似文献
11.
12.
13.
丙烯环氧化反应用Au/TiO2系列催化剂的制备与表征 总被引:3,自引:0,他引:3
用沉积-沉淀法制备了Au/TiO2系列催化剂,并用XRD,TG-DTA,BET,TEM和IR等技术对催化剂的物相、组成和表面结构进行了表征,利用微反对催化剂在丙烯环氧化反应中的活性进行了评价.结果表明,Au/TiO2催化剂的比表面积在100m2/g以上,Au粒子以纳米级超细颗粒均匀分散在锐钛矿型TiO2的表面.催化剂表面的活性相是Lewis酸位Tin+与Au粒子,Au可以吸附氢与氧并将其转化为过氧化物.在50~150℃温度范围内,丙烯的转化率为0.56%~1.16%,环氧丙烷的选择性在87%以上.原料气中H2或O2的含量增大时,丙烯的转化率随之升高.在催化剂中引入碱金属或碱土金属的硝酸盐作为助剂,可以不同程度地提高催化剂的活性. 相似文献
14.
J. H. Jung M. Ree T. Chang 《Journal of polymer science. Part A, Polymer chemistry》1999,37(16):3329-3336
The catalytic activities of tetraphenylporphinatoaluminum chloride (TPPAlCl) and its propylene oxide adduct (TPPAl(PO)2Cl) were investigated in detail together with a quarternary salt Et4NBr for the copolymerization of carbon dioxide and propylene oxide. In addition, for the components and starting raw materials of the catalyst systems, catalytic activities were examined for the copolymerization. The TPPAlCl catalyst delivered oligomers containing ether linkages to a large extent, regardless of its PO adduction. And cyclic propylene carbonate, as byproduct, was formed in a very small portion. Using the TPPAlCl coupled with Et4NBr as a catalyst system, the formation of ether linkages was reduced significantly in the copolymerization; however, the obtained oligomer still contained ether linkages of 25.0 mol % in the backbone. On the other hand, the formation of cyclic carbonate was increased to 22.4 mol % relative to the oligomer product. The results indicate that the salt, which was coupled with the TPPAlCl catalyst, plays a key role in reducing the formation of ether linkage in the oligomer and, however, in enhancing the formation of cyclic carbonate. Similar results were obtained for the copolymerization catalyzed by the TPPAl(PO)2Cl/Et4NBr system. That is, the formation of ether linkages was not restricted further by the PO adduction of the TPPAlCl component in the catalyst system. Only oligomers with a relatively high molecular weight were produced. This indicates that the PO adduction of the TPPAlCl component contributes highly to the initiation and propagation step in the oligomerization, consequently leading to a relatively high molecular weight oligomer. In contrast, the Et4NBr, as well as the Et2AlCl, produced only cyclic carbonate in a very low yield. Furthermore, tetraphenylporphine exhibited no catalytic activity, regardless of using together with Et4NBr. On the other hand, the Et2AlCl coupled with Et4NBr provided a low molecular weight oligomer having ether linkages of 92.3 mol % in addition to the cyclic carbonate. © 1999 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 37: 3329–3336, 1999 相似文献
15.
Sakharov A. M. Il"in V. V. Rusak V. V. Nysenko Z. N. Klimov S. A. 《Russian Chemical Bulletin》2002,51(8):1451-1454
Copolymerization of carbon dioxide with propylene oxide in the presence of zinc adipate was studied. The effects of the temperature, nature of the solvent, and catalyst concentration on the molecular weight, molecular-weight distribution, and yields of the copolymer and propylene carbonate were examined. The structure of the polymer obtained was studied by 13N and 1I NMR spectroscopy. 相似文献
16.
17.
Catalytic Formation of Propylene Carbonate from Supercritical Carbon Dioxide/Propylene Oxide Mixture
TheuseofsupercriticalcarbondioxideasasubstitUtesolventforchemicalsynthesisisaveryattractiveareainviewofresourceutiIizationandenvironmentalproblems"'.SinceCO2,whichhasaneasilyaccessibIecriticalpointwithaTcof3l.l'CandaPcof7.3MPa,isnontoxic,nonflammableandinexpensive,itcanreplacehazardousorganicsolventandtherebyprovideavaluablepollutionpreventiontool.Assimilartoothersupercriticalfluids,SC-CO,hasgaslikediffusitivityandliquidIikedensity,andchangingpressureandtemperaturecanvaryitsphysicalpro… 相似文献
18.
用溶胶-凝胶法制得了Fe-Al-P-O催化剂,采用IR、XRD、TEM、BET、TPR和微反等技术研究了催化剂的物化性质和反应性能。实验结果表明,Fe1/2-Al1/2-PO4由10 nm左右 FePO4和AlPO4微晶组合而成,其晶格氧的活泼性大于单纯FePO4,AlPO4在Fe1/2-Al1/2-PO4中起到分散FePO4微晶的作用;Fe1/2-Al1/2-PO4的反应性能与原料气组成密切相关,丙烯与O2的选择氧化产物主要是丙烯醛,原料气中加入H2后,反应产物以环氧丙烷为主,同时还有部分丙烯醛,原料气中引入水蒸气后,可进一步增加环氧丙烷的选择性及减少丙烯醛的产率;在0.1 MPa、200 ℃、C3H6/O2/H2/H2O/N2=1∶1∶1∶1∶6(mol比)和空速1 200 h-1条件下,丙烯的转化率为8.9%,环氧丙烷的选择性为81.0%。 相似文献
19.
20.
不同介质中热处理TS-1的表征及催化性能 总被引:3,自引:0,他引:3
分别以水汽和空气为介质对TS-1进行热处理,并采用XRF,XRD,FT-IR,UV-Vis,27AlMASNMR,29SiMASNMR,31PMASNMR和NH3-TPD等手段对TS-1热处理后骨架结构变化及B酸中心和酸量变化进行了分析.以丙烯环氧化反应为探针,考察了酸中心变化对TS-1催化性能的影响.结果表明,TS-1中的微量铝随着热处理温度的升高而减少,导致B酸中心数量及总酸量减少,环氧丙烷选择性提高,以水汽为介质热处理时脱铝更明显.热处理温度达到750℃时,TS-1分子筛中的硅氧四面体发生变化,不同的介质对骨架钛产生不同的影响. 相似文献