Design of low-crystalline and low-density isobutyl-substituted caged silsesquioxane derivatives by star-shaped architectures linked with short aliphatic chains
Design of low-crystalline and low-density isobutyl-substituted caged silsesquioxane derivatives by star-shaped architectures linked with short aliphatic chains
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通过与短脂肪链连接的星形结构设计低结晶和低密度异丁基取代的笼状倍半硅氧烷衍生物
DOI：
10.1038/pj.2015.114
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发表时间：
2016
期刊：
影响因子：
2.8
通讯作者：
K. Naka
中科院分区：
文献类型：
--
作者：
Yuta Yasumoto;Takahiro Yamanaka;S. Sakurai;Hiroaki Imoto;K. Naka
通过单乙烯基、烯丙基和辛烯基异丁基-T8-笼状倍半硅氧烷（1a、1b和1c）的硅氢加成反应，沿着合成了八二甲基硅氧基-C8-笼状倍半硅氧烷（2），分别合成了C2、C3和C8连接的星形异丁基取代笼状倍半硅氧烷衍生物（3a、3b和3c）.图3a和3b通过将溶液流延到玻璃片上形成光学透明膜。然而，3c形成不透明的白色膜。3a和3b的差示扫描量热曲线显示出比3c低的熔点和玻璃化转变点的出现，表明它们的结晶度较低，这促进了透明膜的形成。广角X射线散射测量表明，3a和3b形成更紧密的包装结构后熔化。然而，3c在熔化后形成较不致密的结构。3a的膜的折射率（1.4529±0.0005）低于3b的膜的折射率（1.4556±0.0007），这是由于3a的密度（1.1433g cm-3）小于3b的密度（1.1753g cm-3）。
The C2-, C3-, and C8-linked star-shaped isobutyl-substituted caged silsesquioxane derivatives (3a, 3b and 3c) were prepared by the hydrosilylation of mono-vinyl-, allyl-and octenylisobutyl-T 8-silsesquioxane (1a, 1b and 1c), respectively, along with the synthesis of octadimethylsiloxy-Q 8-silsesquioxane (2). 3a and 3b formed optically transparent films by casting the solutions onto glass pieces. However, 3c formed an opaque white film. Differential scanning calorimetry traces of 3a and 3b exhibited lower melting points than that of 3c and the appearance of a glass-transition point, suggesting their lower crystallinity, which promotes the formation of transparent films. Wide-angle X-ray scattering measurements suggested that 3a and 3b formed more tightly packed structures after melting. However, 3c formed a less dense structure after melting. The refractive index of the film of 3a (1.4529±0.0005) was lower than that of 3b (1.4556±0.0007), which is due to the density of 3a (1.1433 g cm− 3) being less than that of 3b (1.1753 g cm− 3).