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大四写论文金虫 (正式写手)
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Among oligomeric siloxane units, the cubic octameric siloxane cage Si8O12, commonly termed double four-ring (D4R), is of particular interest as an ideal molecular building unit because of its rigidity, hyperbranched architecture,high symmetry, and ease of functionalization. D4R moieties bearing specific functional groups such as aldehyde, carboxyl,and epoxy have been used in diverse forms as model catalysts, components for polymer blends, organic light-emitting diodes, and so on. Early attempts to construct silicabased micro- and/or mesoporous materials with molecular homogeneity from predefined D4R units involved surfactant-directed co-assembly of D4R cages,[9] cross-linking of D4R units by hydrosilylation, polycondensation of alkoxysilylated cages, and self-assembly of well-designed amphiphilic molecules containing D4R cages. Although claims were made that D4R units were retained in the siloxane networks,control over the microscopic arrangement of the cages and subsequent micropore size distribution remains to be achieved. |
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jiangguofeng
金虫 (著名写手)
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大四写论文: 金币+20, ★★★很有帮助 2015-03-14 13:28:53
大四写论文: 金币+20, ★★★很有帮助 2015-03-14 13:28:53
| 在低聚物硅氧烷单元当中，作为理想的分子结构单元，通常称为双四节环(D4R)的立方八聚体硅氧烷笼Si8O12因其具有刚性、超支化结构、高对称以及易于功能化的特性而倍受关注。 带有诸如醛、羧基及环氧基等特定官能团的D4R结构部分已经以各种形式作为典型的催化剂、高聚体混合物组分以及有机发光二极管等等使用。早期由预先确定的D4R单元来构建具有分子均一性的硅基微孔及/或中孔材料的尝试包括表面活性剂作用下D4R笼的共组装、D4R单元的氢化硅烷化的[9]交联、烷氧基甲烷硅基化的笼的缩聚作用以及精心设计的带有D4R笼的两亲分子的自组装。尽管有人声称D4R单元保持在硅氧烷网状结构中,但是实现对这种笼的微观排列和随后的微孔大小分布的控制仍在努力之中。 |
2楼2015-03-09 19:39:32
