Side-Chain Effect of Octa-Substituted POSS Fillers on Refraction in Polymer Composites
Side-Chain Effect of Octa-Substituted POSS Fillers on Refraction in Polymer Composites
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八取代 POSS 填料对聚合物复合材料折射的侧链效应
DOI：
10.1002/pola.24370
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
Y.
中科院分区：
文献类型：
--
作者：
Tanaka;K.; Adachi;S.; Chujo;Y.
为了研究多八面体低聚倍半硅氧烷(POSS)填料侧链的化学结构与降低聚合物复合材料折射率的能力之间的关系，考察了八取代POSS衍生物的存在对聚合物链堆积程度的影响。制备了甲基、乙基、乙烯基、异丁基、辛基、十八基、环戊基和苯基取代聚甲基丙烯酸甲酯(PMMA)聚合物复合材料。用Lorentz-Lorenz方程从薄膜的摩尔折射率和折射率估算了含POSS衍生物的PMMA复合材料的堆积系数。研究发现，乙基的堆积系数最小，对聚合物复合材料的折射率有明显的降低作用。最后，总而言之，研究表明POSS分子本质上可以减少堆积。此外，聚合物链与取代基间的缠结较少，相互作用较小，有利于堆积的释放，导致折射率降低。我们的研究结果首次在分子水平上定量评估了POSS填充物降低折射率的能力。2010Wiley期刊公司，J Polym Sci Part A：Polym Chem，2010
To investigate the relationship between the chemical structures of the side chains of polyoctahedral oligomeric silsesquioxanes (POSS) fillers and the ability to decrease the refractive indices of the polymer composites, we examined the influence on the degree of polymer chain packing by the existence of the octa‐substituted POSS derivatives. The polymer composites containing methyl‐, ethyl‐, vinyl‐, isobutyl‐, octyl‐, octadecyl‐, cyclopentyl‐, and phenyl‐substituted POSS in poly(methyl methacrylate) (PMMA) were prepared. The packing coefficients of the PMMA composites containing POSS derivatives were evaluated from molar refractions and refractive indices of the films with the Lorentz–Lorenz equation. We found that the ethyl group shows the lowest values of the packing coefficients and a significant effect in reducing the refractive indices of the polymer composites. Finally, in summary, it was shown that POSS molecules can intrinsically offer to reduce a packing. In addition, less entanglement and smaller interactions between polymer chains and the substitution groups are favorable to release a packing, resulting in decreases in refractive indices. Our findings described here are the first efforts to quantitatively evaluate the ability of POSS fillers to lower refractive indices at the molecular level. © 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2010