Highly thermally stable mesoporous Poly(cyanate ester) featuring double-decker–shaped polyhedral silsesquioxane framework. (17th December 2019)

• Record Type: Journal Article
• Authors: Chen, Wei-Cheng; Ahmed, Mahmoud M.M.; Wang, Chih-Feng; Huang, Chih-Feng; Kuo, Shiao-Wei
• Is Part Of: Polymer. Volume 185(2019)
• Publication Date: 2019-12-17
• Subjects: Poly(cyanate ester) -- DDSQ -- Nanocomposites; Polymers -- Periodicals; Polymerization -- Periodicals; Polymères -- Périodiques; Polymérisation -- Périodiques; 547.7
• DOI: 10.1016/j.polymer.2019.121940
• Languages: English
• ISSNs: 0032-3861

Abstract

Abstract: In this study we prepared cyanate ester–functionalized double-decker silsesquioxane (DDSQ) nanoparticles through a sequence of hydrosilylation of nadic anhydride (ND) with DDSQ and then treat with 4-aminophenol to provide DDSQ-ND-OH, and reaction with cyanogen bromide (BrCN) to form DDSQ-ND-OCN (a bis-phenyl cyanate ester DDSQ). After thermal curing of DDSQ-ND-OCN, we obtained mesoporous poly(cyanate ester) (PCE)/DDSQ frameworks that displayed high thermal stabilities and char yields since the inorganic DDSQ nanoparticles were dispersed in the PCE matrix homogeneously, as revealed using electron microscopy. Thermal polymerization at 210 °C provided a PCE/DDSQ framework having a thermal decomposition temperature (516 °C) and char yield (70 wt%); these values increased to 600 °C and 81 wt%, respectively, after thermal treatment at 420 °C. More interestingly, these mesoporous PCE/DDSQ frameworks displayed electrochemical properties better than those of other non-carbonized materials. Graphical abstract: Image 1 Highlights: Mesoporous Poly(cyanate ester)–functionalized DDSQ was synthesized. These mesoporous PCE/DDSQ frameworks displayed good electrochemical properties. High thermal stabilities since DDSQ nanoparticles dispersed in PCE matrix homogeneously. Hexagonally packed cylindrical porous structure collapsed after thermal treatment.