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Effect of polyhedral oligomeric silsesquioxanes with different structures on dielectric and mechanical properties of epoxy resin
Polymer Composites ( IF 4.8 ) Pub Date : 2021-05-19 , DOI: 10.1002/pc.26070
Jianyu Qin 1 , Hanpeng Zhao 2 , Zhaolu Qin 1 , Wenchao Zhang 1 , Rongjie Yang 1
Affiliation  

Polyhedral oligomeric silsesquioxane (POSS) is a hybrid material composed of an organic substituent shell and inorganic skeleton core. To study the influence of different shells and cage-shaped cores on dielectric and mechanical properties, four kinds of epoxy resin composites (EPs) fabricated with 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO), DOPO-containing polyhedral oligomeric silsesquioxane (DOPOPOSS), octaphenyl polyhedral oligomeric silsesquioxane (OPS), and epoxy phenyl polyhedral oligomeric silsesquioxane (EPOSS) with the addition of 5 and 10 wt% were prepared, respectively. The dispersion, transparency, glass transition, dielectric, mechanical tensile, flexural, and impact properties of these epoxy resins were studied. Dielectric constant and loss of EPs were significantly reduced through introduction of three POSSs owing to their inherent hollow cores, and dielectric constant of the resins was further decreased with additional increase. Compared with three POSSs, DOPOPOSS had the best compatible shell, and its composites exhibited favorable transparency similar to pure EP and the obvious reduction in dielectric constant and loss, due to its nano-dispersion in matrix. EPOSS was dispersed in a perfect spherical shape and uniformly embedded in matrix, and the composites showed good mechanical tensile, flexural, and impact strength. OPS was disorderly dispersed in resins, but its eight phenyl rings symmetrical shell had the advantage of nonpolar molecule structure, which endowed epoxy resin lower dielectric loss over the high-frequency range (105–106 Hz). Compared with DOPOPOSS, DOPO was effective in reducing dielectric constant and loss of epoxy resin due to its reactive addition, however, it decreased the glass transition temperature, mechanical tensile, flexural, and impact strength of epoxy resin either.

中文翻译:

不同结构多面体低聚倍半硅氧烷对环氧树脂介电和力学性能的影响

多面体低聚倍半硅氧烷(POSS)是一种由有机取代基壳和无机骨架核组成的杂化材料。为了研究不同壳和笼形核对介电和机械性能的影响,采用 9,10-二氢-9-氧杂-10-磷杂菲-10-氧化物 (DOPO) 制备的四种环氧树脂复合材料 (EPs),分别制备了含 DOPO 的多面体低聚倍半硅氧烷 (DOPOPOSS)、八苯基多面体低聚倍半硅氧烷 (OPS) 和环氧苯基多面体低聚倍半硅氧烷 (EPOSS),分别添加了 5 和 10 重量%。研究了这些环氧树脂的分散性、透明度、玻璃化转变、介电、机械拉伸、弯曲和冲击性能。通过引入三个POSSs,由于它们固有的空心,EPs的介电常数和损耗显着降低,并且树脂的介电常数随着额外增加而进一步降低。与三种 POSS 相比,DOPOPOSS 具有最佳的相容性壳,其复合材料表现出类似于纯 EP 的良好透明度,并且由于其在基体中的纳米分散,介电常数和损耗明显降低。EPOSS呈完美球形分散并均匀嵌入基体中,复合材料表现出良好的机械拉伸、弯曲和冲击强度。OPS在树脂中无序分散,但其8个苯环对称壳具有非极性分子结构的优点,使环氧树脂在高频范围内具有较低的介电损耗(10 树脂的介电常数随着额外的增加而进一步降低。与三种 POSS 相比,DOPOPOSS 具有最佳的相容性壳,其复合材料表现出类似于纯 EP 的良好透明度,并且由于其在基体中的纳米分散,介电常数和损耗明显降低。EPOSS呈完美球形分散并均匀嵌入基体中,复合材料表现出良好的机械拉伸、弯曲和冲击强度。OPS在树脂中无序分散,但其8个苯环对称壳层具有非极性分子结构的优点,使环氧树脂在高频范围内具有较低的介电损耗(10 树脂的介电常数随着额外的增加而进一步降低。与三种 POSS 相比,DOPOPOSS 具有最佳的相容性壳,其复合材料表现出类似于纯 EP 的良好透明度,并且由于其在基体中的纳米分散,介电常数和损耗明显降低。EPOSS呈完美球形分散并均匀嵌入基体中,复合材料表现出良好的机械拉伸、弯曲和冲击强度。OPS在树脂中无序分散,但其8个苯环对称壳具有非极性分子结构的优点,使环氧树脂在高频范围内具有较低的介电损耗(10 由于其在基体中的纳米分散,其复合材料表现出类似于纯 EP 的良好透明度以及介电常数和损耗的明显降低。EPOSS呈完美球形分散并均匀嵌入基体中,复合材料表现出良好的机械拉伸、弯曲和冲击强度。OPS在树脂中无序分散,但其8个苯环对称壳具有非极性分子结构的优点,使环氧树脂在高频范围内具有较低的介电损耗(10 由于其在基体中的纳米分散,其复合材料表现出类似于纯 EP 的良好透明度以及介电常数和损耗的明显降低。EPOSS呈完美球形分散并均匀嵌入基体中,复合材料表现出良好的机械拉伸、弯曲和冲击强度。OPS在树脂中无序分散,但其8个苯环对称壳具有非极性分子结构的优点,使环氧树脂在高频范围内具有较低的介电损耗(105 –10 6 赫兹)。与 DOPOPOSS 相比,DOPO 由于其反应性加成有效降低了环氧树脂的介电常数和损耗,但它也降低了环氧树脂的玻璃化转变温度、机械拉伸、弯曲和冲击强度。
更新日期:2021-07-08
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