The electrical properties enhance of BEP laminate employing HBP blocking by hexanoic acid

Polymers for Advanced Techs

Guo

et al. 2022

Phthalonitrile resins were an important kind of matrix with high thermal stability.Novel organic-inorganic hybrid composites were prepared by employing 4,4 0 -(1,3-phenylenebis[oxy]) diphthalonitrile (DPN) modified with polyborosilazane ceramic precursor (PBSN) in this work to explore the methods for synthesis of phthalonitrile resin with good processability as well as high heat-resistance. The maximal glass transition temperature (T g ) and 10% weight loss temperatures were about 615.0 and 608.1 C (N 2 ), respectively. The detailed thermal oxygen decomposition

Section: Resultsmentioning

confidence: 99%

Preparation and characterization of a high heat resistant phthalonitrile resin modified by polyborosilazane ceramic precursor

Wang

Polymers for Advanced Techs

Guo

et al. 2022

“…As discussed in previous sections, the crosslinking density of CR‐2 resins was lower, when compared with that of cured CR‐0. Thus, the mobility of the chain segments increased, and polar groups became free to orient and relax by overcoming internal friction, the increase of free volume may reduce the dielectric properties of materials …”

Section: Resultsmentioning

confidence: 99%

Thermal and water absorption properties of cyanate ester resins modified by fluoride‐containing and silicone‐containing components

Pei

Polymers for Advanced Techs

Guo

et al. 2020

resin matrix, hence reducing the water absorption of the materials. [22][23][24][25][26][27][28][29] More importantly, silicon-containing resins exhibited excellent heat resistance, weather resistance, and electrical insulation, 1,8,[30][31][32][33][34][35][36] while fluorine-containing resins also have advantages in heat resistance, dielectric properties, chemical stability, weather resistance, and nonflammability. These features were made silicon-containing and fluorine-containing resins suitable components for the modification of high temperature dielectric thermosets, and some successful examples were already realized in CE resins. Yang et al reported the preparation of epoxidized polysiloxane (E-Si), and the addition of E-Si into CE resin cannot only significantly decrease the curing temperature of the CE resin but also improve its water resistance and toughness. 22 Dai et al reported an epoxidized polysiloxane with amino silicone and used it as a modifier to effectively reduce the dielectric constant of CE resin. 28 Guenthner et al reported the preparation of a novel silyl cyanate monomer from bis (4-cyanophenyl) dimethylsilane (Simcy), and moisture absorption of the as-prepared CE resin was reduced by 50%, when compared with pure CE resin. 37 Gu's group synthesized high-quality and stable fluoride-containing compound 2-((3-(trifluoromethyl)phenoxy)methyl) oxirane (TFMPMO), and the results showed that TFMPMO was gifted with lower moisture absorption than cyanate ester resins. 25 Chao Yuan et al prepared a novel fluoropolymer, which could help reduce the moisture absorption of pure CE resin. 8 Guo et al 26 prepared a novel fluorinated allyl compound (6FDABPA) and used it to reduce water absorption of CE resins. As mentioned above, fluorine-and silicon-containing resins have demonstrated positive effect on the hygroscopicity of CE resins. However, comprehensive evaluation should be considered during the modification of CE resins, where the suppression of water absorption should not berealized at big costs of thermal and mechanical properties. 8,32,33 Herein in this paper, a series of novel silicone-containing and fluorine-containing components were prepared and introduced into CE resins, and the water absorption, thermal, mechanical, and dielectric properties were systematically characterized. The structure-property relationship was proposed and discussed.

“…The special structure of hyperbranched structure led to low dielectric properties and toughening effect of synthesized resin. [29][30][31] The prepared resin was cured at high temperature, and the mechanical and thermal properties of the cured products were characterized.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of phthalonitrile resin within hyperbranched structure

Wang

Liu

High Performance Polymers

et al. 2020

In this article, a kind of polyester-type phthalonitrile cyano resin (2,2-bis (((3-((4-(3,4-dicyanophenoxy) benzoyl)oxy)-2-(hydroxymethyl)-2-methylpropanoyl)oxy)methyl) propane-1,3-diyl)bis(oxy)) bis (2-(hydroxymethyl)-2-methyl-3-oxopropane-3, 1-diyl) bis (4-(3,4-dicyanophenoxy) benzoate (hbppn)) with branched structure was introduced. The molecular structure and relative molecular mass of hbppn were characterized by nuclear magnetic resonance, Fourier transform infrared spectroscopy, and the matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF). The results showed that the synthesized HBPPN contained both polyester and hyperbranched structures. The thermal and rheological properties of HBPPN were characterized by differential scanning calorimetry and rheometer, and the results showed that HBPPN would be cured at about 322°C and the viscosity of the resin showed good processability. The results of dynamic mechanical analysis and thermogravimetric analysis showed that the synthesized resin had good heat resistance. The glass transition temperature was above 329°C, the residual weight ( C y) at 900°C was as high as 66.2% in the nitrogen atmosphere, and the temperature at which the resin lost 5 wt% of heat in air atmosphere was about 423.3°C. The synthesized HBPPN had good comprehensive properties, which could be applied to high-temperature resistant and thermal protection materials.