Enhanced thermal and anti‐ablation properties of high‐temperature resistant reactive POSS modified boron phenolic resin

2021 ◽  
pp. 52086
Author(s):  
Zhaoqi Niu ◽  
Gang Li ◽  
Yi Xin ◽  
Xiaoyan Ma ◽  
Chengshuang Zhang ◽  
...  
Keyword(s):  
High Temperature ◽  
Phenolic Resin

scholarly journals Improved high-temperature damping performance of nitrile-butadiene rubber/phenolic resin composites by introducing different hindered amine molecules

e-Polymers ◽  
2020 ◽  
Vol 20 (1) ◽  
pp. 482-490
Author(s):  
Meng Song ◽  
Xiulin Yue ◽  
Xiujuan Wang ◽  
Mengjie Huang ◽  
Mingxing Ma ◽  
...  
Keyword(s):  
High Temperature ◽  
Phenolic Resin ◽  
Thermomechanical Analysis ◽  
Butadiene Rubber ◽  
Scanning Calorimetry ◽  
Nitrile Butadiene Rubber ◽  
Theoretical Support ◽  
Higher Temperature ◽  
Damping Materials ◽  
Hybrid Damping

AbstractBy introducing hindered amine GW-622 or GW-944 into nitrile-butadiene rubber/phenolic resin (NBR/PR, abbreviated as NBPR) matrix, we have prepared different hindered amine/NBR/PR ternary hybrid damping materials with high-temperature damping performance, respectively. Fourier transform infrared (FTIR) spectroscopy, scanning electron microscope (SEM), differential scanning calorimetry (DSC), and dynamic thermomechanical analysis (DMA) were used to research the microstructure, compatibility, and damping properties of the hindered amine/NBPR composites. FTIR results indicate that hydrogen bonds are formed between the hindered amine and the NBPR matrix. Both DSC and SEM results show that hindered amine has partial compatibility with the NBPR matrix. DMA results show that two loss peaks appear in the hindered amine/NBPR composite. Thereby, the composites show better damping performance at a higher temperature, and the temperature domain of high-temperature damping becomes wider with the increase in the addition of hindered amine. This study provides a theoretical support for the preparation of high-temperature damping materials.

High temperature ablation of kaolinite layered silicate/phenolic resin/asbestos cloth nanocomposite

2008 ◽  
Vol 150 (1) ◽  
pp. 136-145 ◽  
Author(s):  
Ahmad Reza Bahramian ◽  
Mehrdad Kokabi ◽  
Mohammad Hossein Navid Famili ◽  
Mohammad Hossein Beheshty
Keyword(s):  
High Temperature ◽  
Phenolic Resin ◽  
Layered Silicate

scholarly journals Carbon-Supported Raney Nickel Catalyst for Acetone Hydrogenation with High Selectivity

Molecules ◽  
2020 ◽  
Vol 25 (4) ◽  
pp. 803
Author(s):  
Shuliang Lu ◽  
Jiajia Wu ◽  
Hui Peng ◽  
Yong Chen
Keyword(s):  
High Temperature ◽  
Green Chemistry ◽  
Phenolic Resin ◽  
High Selectivity ◽  
Ni Catalyst ◽  
Al Alloy ◽  
Raney Nickel Catalyst ◽  
Raney Ni ◽  
New Type ◽  
Acetone Hydrogenation

Catalysts with high selectivity play key roles in green chemistry. In this work, a granular Raney Ni catalyst using carbon as support (Raney Ni/C) was developed by mixing phenolic resin with Ni-Al alloy, conducting carbonization at high temperature, and leaching with alkaline liquor. The as-prepared Raney Ni/C catalyst is suitable for use in fix-bed reactors. Moreover, it shows high activity and selectivity for catalytic acetone hydrogenation. For instance, at the reaction temperature of 120 °C, the conversion of acetone can reach up to 99.9% and the main byproduct methyl isobutylcarbinol (MIBC) content can be diminished to 0.02 wt%. The Raney Ni/C may represent a new type of shaped Raney metal catalysts, which are important fix-bed catalysts in chemical industry.

Polyacrylamide gel formed by Cr(III) and phenolic resin for water control in high-temperature reservoirs

2020 ◽  
Vol 194 ◽  
pp. 107423 ◽  
Author(s):  
Shiling Zhang ◽  
Jixiang Guo ◽  
Yu Gu ◽  
Qing Zhao ◽  
Ruijie Yang ◽  
...  
Keyword(s):  
High Temperature ◽  
Phenolic Resin ◽  
Polyacrylamide Gel ◽  
Water Control

scholarly journals Strong and Thermostable Boron-Containing Phenolic Resin-Derived Carbon Modified Three-Dimensional Needled Carbon Fiber Reinforced Silicon Oxycarbide Composites with Tunable High-Performance Microwave Absorption Properties

2020 ◽  
Vol 10 (6) ◽  
pp. 1924 ◽  
Author(s):  
Yu Sun ◽  
Yuguo Sun
Keyword(s):  
High Temperature ◽  
Carbon Fiber ◽  
High Temperature Oxidation ◽  
Phenolic Resin ◽  
Three Dimensional ◽  
Silicon Oxycarbide ◽  
Fiber Reinforced ◽  
Absorption Properties ◽  
Temperature Oxidation ◽  
Carbon Fiber Reinforced

This paper focuses on the preparation of boron-containing phenolic resin (BPR)-derived carbon modified three-dimensional (3D) needled carbon fiber reinforced silicon oxycarbide (SiOC) composites through a simple precursor infiltration and pyrolysis process (PIP), and the influence of PIP cycle numbers on the microstructure, mechanical, high-temperature oxidation resistance. The electromagnetic wave (EMW) absorption properties of the composites were investigated for the first time. The pyrolysis temperature played an important role in the structural evolution of the SiOC precursor, as temperatures above 1400 °C would cause phase separation of the SiOC and the formation of silicon carbide (SiC), silica (SiO2), and carbon. The density and compressive strength of the composites increased as the PIP cycle number increased: the value for the sample with 3 PIP cycles was 0.77 g/cm3, 7.18 ± 1.92 MPa in XY direction and 9.01 ± 1.25 MPa in Z direction, respectively. This composite presented excellent high-temperature oxidation resistance and thermal stability properties with weight retention above 95% up to 1000 °C both under air and Ar atmosphere. The minimal reflection loss (RLmin) value and the widest effective absorption bandwidth (EAB) value of as-prepared composites was −24.31 dB and 4.9 GHz under the optimization condition for the sample with 3 PIP cycles. The above results indicate that our BPR-derived carbon modified 3D needled carbon fiber reinforced SiOC composites could be considered as a promising material for practical applications.

Effect of B4C and SiO2 on Bond Property for Phenolic Resin-Based Adhesive

2018 ◽  
Vol 281 ◽  
pp. 959-963
Author(s):  
Feng Zhang ◽  
Chuan Qi Hu ◽  
Shi Chao Zhang ◽  
Hao Ran Sun ◽  
Yuan Tian ◽  
...  
Keyword(s):  
Heat Treatment ◽  
High Temperature ◽  
Bond Strength ◽  
Boron Carbide ◽  
Bonding Strength ◽  
Heat Treatment Temperature ◽  
Room Temperature ◽  
Phenolic Resin ◽  
Optical Microscope ◽  
Treatment Temperature

In this paper, the modified phenolic resin-based adhesive was prepared by dissolving different components. After low temperature curing, SiC samples were bonded by the binder. The samples were treated at different temperatures (400°C, 800°C, 1200°C, 1500°C) under an inert atmosphere. The bonding strength of samples was tested after heat treatment at room temperature. The results showed that the bonding strength of the B4C modified phenolic resin (PF) based adhesive is the highest. When the heat treatment temperature was above 1200°C, the bond strength increased with the additive amount of boron carbide at room temperature. The microstructures of the samples were observed by optical microscope and scanning electron microscope. The effects of the modified filler and heat treatment temperature on the bonding strength of the phenolic resin based adhesive were investigated. The bonding strength of boron carbide-modified phenolic resin-based binder was tested under high temperature. It was found that the bond strength at high temperature was lower than that at room temperature, and the bond strength decreased with the increase of temperature.

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