Preparation of POSS/Quartz fibers/cyanate ester resins laminated composites

Abstract

Quartz fibers (QFs) and two polyhedral oligomeric silsesquioxane (POSS) (epoxy‐POSS and hydroxy‐POSS) are performed to regulate the dielectric properties, heat resistance, and mechanical properties of cyanate ester (CE) resins. With the introduction of POSS, the dielectric constant and dielectric loss tangent values of the POSS/QFs/CE laminated composites are decreased obviously. The heat resistance properties and flexural strength values of the laminated composites are increased, but the interlaminar shear strength values of the laminated composites are decreased slightly. The EP‐POSS/QFs/CE laminated composites have relatively better dielectric, heat resistance, and mechanical properties than those of HO‐POSS/QFs/CE laminated composites. POLYM. COMPOS., 36:2017–2021, 2015. © 2014 Society of Plastics Engineer

Preparation of Tri(alkenyl)functional Open-Cage Silsesquioxanes as Specific Polymer Modifiers

“…The decomposition process of the SQ-Ph functionalized silsesquioxanes also became more complex, spread in time and was shifted to the lower temperatures when compared to SQ-Ph-OH derivative. The values of the char yield at 1000 • C obtained for all functionalized SQ-Ph-Vi, SQ-Ph-All, SQ-Ph-Hex, and SQ-Ph-Dec silsesquioxanes (38,39,29, and 28%, respectively) were lower than those that were measured for starting SQ-Ph-OH derivative (43%) unlike in the case of SQ-iBu-OH derivative. Moreover, it can be observed that char yields of the SQ-Ph-Vi and SQ-Ph-All samples were notably higher than those of SQ-Ph-Hex and SQ-Ph-Dec ones, which result from the lower carbon content in their structure.…”

“…Multi-functional SQs may additionally offer the possibility to obtain three-dimensional (3D) copolymeric networks, leading to substantial improvement in their physicochemical properties, i.e., increased thermal and oxidation resistance, mechanical properties, e.g., hardness, as well as the reduction of flammability, heat evolution, viscosity during processing, etc. [35][36][37][38][39][40][41][42][43][44][45][46][47].…”

Fabrication and properties of BADCy modified by epoxy-capped polyhedral oligomeric silsesquioxane

“…On the other hand, a large number of aromatic rings, aryl and heterocyclic linkages, and the unique triazine rings also result in CE resins' high mechanical strength, good thermal resistance, and high dimensional stability. [3][4][5][6][7][8][9][10][11][12][13] As a new type of organic-inorganic hybrid nanomaterials, POSS embodies a truly cage-like silsesquioxane architecture containing an inner inorganic framework made up of silicon and oxygen. 14,15 The structural features of POSS are hollow closed or semiclosed cage, presenting low density, gas permeability, high dielectric performance, and optical property.…”

Design and multibody dynamics analyses of the novel force-bearing structures for variable configuration spacecraft

“…Continuous fiber-reinforced polymer matrix composites present promising applications as main force-bearing structures in VCS, owing to their light weight, high specific strength and modulus, good radiation resistance, and easy processing properties [8][9][10]. Bismaleimide (BMI) resins possess excellent mechanical properties, outstanding thermal stabilities, good radiation resistances, and attractive cost-to-performance ratio [11][12][13][14][15].…”