A Novel Zirconium Modified Arylacetylene Resin: Preparation, Thermal Properties and Ceramifiable Mechanism

Abstract

With the rapid development of thermal protection systems for the aerospace industry and power electronics, polyarylacetylene (PAA) resin plays an important role because of its good mechanical properties, high glass transition temperature (T g ), low water absorption, high char yield (Y c ), and the fact that there is no byproduct released in the curing process. In order to further improve the thermal property of PAA based FRP for the thermal protection field, the introduction of a zirconium element into arylacetylene is promising. In this paper, zirconium modified arylacetylene (ZAA) resin was prepared by two-step synthesis. The FTIR analysis characterized its molecular structure and confirmed the products. The viscosity of ZAA was about 6.5 Pa·s when the temperature was above 120 • C. The DSC analysis showed that the ZAA had a low curing temperature, and its apparent activation energy was 103.86 kJ/mol in the Kissinger method and 106.46 kJ/mol in the Ozawa method. The dielectric constant at 1 MHz of poly(zirconium modified arylacetylene) (PZAA) was 3.4. The TG analysis showed that the temperatures of a weight loss of 5% (T d5 ) and char yield (Y c ) at 800 • C of PZAA were 407.5 • C and 61.4%, respectively. The XRD results showed the presence of SiO 2 and ZrO 2 in the PZAA residue after ablation. The XRF results showed that the contents of SiO 2 and ZrO 2 in PZAA residual after ablation were, respectively, 15.3% and 12.4%. The SEM showed that the surface of PZAA after ablation had been covered with a dense and rigid ceramic phase composed of ZrO 2 and SiO 2 . Therefore, the introduction of Zr into arylacetylene greatly improved the densification of the surface after ablation, and improved the heat resistant property.

Ceramifiable Silicone Rubber Composites with Enhanced Self-Supporting and Ceramifiable Properties

“…Commonly, ceramifiable polymer composites are prepared by incorporating mineral fillers, flame-retardant additives, and other additives into the polymer. They have the properties of matrix materials at room temperature and could also be transformed into ceramic-like residues at high temperatures [ 3 , 4 , 5 ]. Herein, the mineral fillers are important components for ceramifiable polymer composites, which will be melted at elevated temperatures to interact with other additives.…”

Ablation properties of zinc borate and aluminum hypophosphite filled silicone rubber composites

“…Ablation‐resistant polymers consist of flexible and hard materials. Hard materials include phenolic, 3–6 aryl acetylene 7 and other resin materials, which have been extensively studied. Flexible ablative materials have gradually become a new research hotspot due to their excellent thermal stability, good erosion resistance, and good sealing.…”