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大四寫論文金蟲 (正式寫手)
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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
金蟲 (著名寫手)
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大四寫論文: 金幣+20, ★★★很有幫助 2015-03-14 13:28:53
大四寫論文: 金幣+20, ★★★很有幫助 2015-03-14 13:28:53
| 在低聚物硅氧烷單元當(dāng)中，作為理想的分子結(jié)構(gòu)單元，通常稱為雙四節(jié)環(huán)(D4R)的立方八聚體硅氧烷籠Si8O12因其具有剛性、超支化結(jié)構(gòu)、高對(duì)稱以及易于功能化的特性而倍受關(guān)注。 帶有諸如醛、羧基及環(huán)氧基等特定官能團(tuán)的D4R結(jié)構(gòu)部分已經(jīng)以各種形式作為典型的催化劑、高聚體混合物組分以及有機(jī)發(fā)光二極管等等使用。早期由預(yù)先確定的D4R單元來(lái)構(gòu)建具有分子均一性的硅基微孔及/或中孔材料的嘗試包括表面活性劑作用下D4R籠的共組裝、D4R單元的氫化硅烷化的[9]交聯(lián)、烷氧基甲烷硅基化的籠的縮聚作用以及精心設(shè)計(jì)的帶有D4R籠的兩親分子的自組裝。盡管有人聲稱D4R單元保持在硅氧烷網(wǎng)狀結(jié)構(gòu)中,但是實(shí)現(xiàn)對(duì)這種籠的微觀排列和隨后的微孔大小分布的控制仍在努力之中。 |
2樓2015-03-09 19:39:32
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