POSS Core star‐shape molecular hybrid materials: Effect of the chain length and POSS content on dielectric properties
POSS Core star‐shape molecular hybrid materials: Effect of the chain length and POSS content on dielectric properties
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DOI：
10.1002/app.37507
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发表时间：
2013-02
影响因子：
3
通讯作者：
Fuyou Ke;Chaofu Zhang;Shanyi Guang;Hongyao Xu
中科院分区：
文献类型：
--
作者：
Fuyou Ke;Chaofu Zhang;Shanyi Guang;Hongyao Xu
合成了一系列无机-有机分子杂化物聚（苯乙烯-co-八乙烯基-多面体低聚倍半硅氧烷）（PS-POSSs），并通过FTIR、1H-NMR、29 Si-NMR、XRD、光学显微镜（OM）和原子力显微镜（AFM）对其结构和性能进行了表征。POSS与聚合物基体的化学结合实现了均匀的分散，并使所得杂化物显示出良好的成膜性。研究了这些杂化材料的分子结构与其介电常数的关系以及低介电常数的形成机理。杂化材料的低介电常数主要来源于自由体积的增加，包括POSS固有孔隙的自由体积和体积大的POSS空间位阻的自由体积的增加，后者对自由体积的增加和低介电常数的形成起主导作用。同时，聚合物臂长对星形杂化材料的介电常数也有重要影响。© 2012 Wiley Periodicals，Inc. J.应用聚合物科学，2013
A series of inorganic–organic molecular hybrids, poly(styrene-co-octavinyl-polyhedral oligomeric silsesquioxane)s (PS-POSSs), were synthesized, and their structures and properties were characterized by FTIR, 1H-NMR, 29Si-NMR, XRD, optical microscopy (OM), and atomic force microscopy (AFM). The chemical incorporation of POSS into polymer matrixes achieves uniform dispersion and makes the resultant hybrids display good film formability. The relationship between molecular structure of these hybrids and their dielectric constants and formation mechanism of low dielectric constant were investigated. The low dielectric constant of the hybrids mainly originates from the increase of free volume, involving the free volume of intrinsic porosity from POSS and an increase in the free volume owing to steric hindrance of bulky POSS. The latter plays a dominant role to increase the free volume and formation of low dielectric constant. Simultaneously, the polymer arm-length has an important influence on the dielectric constant of the star-type hybrids. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013