Study on Properties of Heat-Resistant Hybrid Resin Containing Silicon and Composites

In recent years, one kind of novel hybrid polymer containing silicon has already been reported in the field of high-temperature resistance polymer. Gradually, it has been a research hotspot in the field of high-performance matrix resins because of excellent heat resistance and dielectric properties. The composite was prepared by M-aminophenylacetylene terminated polymethyldiphenylethynyl silane (MDPES-2) as a matrix and nonalkali glass cloth as reinforced material using a hot press process. The cure reaction of MDPES-2 was characterized. Meanwhile, heat resistance, mechanical properties, and dielectric properties of MDPES-2 composites were systematically studied in this paper. The results showed that flexural strength at room temperature is 321 MPa and flexural strength retention at 240°C was 98.3%. Flexural strength retention after thermal treatment at 500°C for 7 min was 84%. In addition, ε and dielectric dissipation factor ( tan δ ) were 3.9 and 2.0 × 10 − 3 (10 GHz).

Download Full-text

High Performance Porous Wave-Transmitting Silicon Nitride Ceramics by Gel-Casting Technique

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.512-515.869 ◽

2012 ◽

Vol 512-515 ◽

pp. 869-872 ◽

Cited By ~ 2

Author(s):

Jian Zhang ◽

Ji Wei Chen ◽

Hong Jie Wang

Keyword(s):

Dielectric Constant ◽

Dielectric Properties ◽

Flexural Strength ◽

High Performance ◽

Sintering Temperature ◽

Resonant Cavity ◽

Porous Ceramics ◽

Cavity Method ◽

Pore Former ◽

Gel Casting

Porous wave transmitting Si3N4 ceramics have been of great interest and technological importance in aerospace area. In this paper, the high performance wave transmitting porous Si3N4 ceramics was prepared by gel-casting method, without any pore-former. The porosity was controlled by the solid content of the slurry and the sintering temperature. The flexural strength and dielectric properties of the material were determined by three bending method and a resonant cavity method. The relationship of the dielectric constant versus the sintering temperature was discussed, and the effect of porosity on dielectric properties was investigated also. As a result, the flexural strength of the porous Si3N4 is 40-200MPa with porosity of 67-45%, dielectric constant of 2.2-3.4 in the frequency of 8GHz at room temperature. With the increase of porosity, both the dielectric constant and dielectric loss decreased. This technique is considered to be a potentially useful method to fabricate the porous ceramics with complex shape.

Download Full-text

A reconfigurable low-power high-performance matrix multiplier architecture with borrow parallel counters

Proceedings International Parallel and Distributed Processing Symposium ◽

10.1109/ipdps.2003.1213336 ◽

2004 ◽

Author(s):

Rong Lin

Keyword(s):

Low Power ◽

High Performance ◽

Performance Matrix

Download Full-text

Densification, flexural strength and dielectric properties of CaO-MgO-ZnO-SiO2/Al2O3 glass ceramics for LTCC applications

Ceramics International ◽

10.1016/j.ceramint.2021.07.051 ◽

2021 ◽

Author(s):

Liutong Xiang ◽

Chaowei Zhong ◽

Tianyin Qin ◽

Mingxia Wang ◽

Dongshuo Liu ◽

...

Keyword(s):

Dielectric Properties ◽

Flexural Strength ◽

Glass Ceramics

Download Full-text

Influence of Oxygen Plasma Modification Carbon Fiber on Flexural Strength and Hydrothermal Properties of CF/PES Composite

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.926-930.141 ◽

2014 ◽

Vol 926-930 ◽

pp. 141-144

Author(s):

Xu Cui ◽

Yan Jiao Huang ◽

Yu Gao ◽

Shuo Wang

Keyword(s):

Composite Material ◽

Carbon Fiber ◽

Flexural Strength ◽

Plasma Treatment ◽

Oxygen Plasma ◽

Retention Rate ◽

Test Method ◽

Plasma Modification ◽

Resin Matrix ◽

Strength Retention

In this paper, low temperature oxygen plasma treatment method was adopted to process the carbon fiber surface. Flexural Strength test method was utilized to represent f composite material flexural strength. This paper observed flexural failure morphology of composite material by aid of SEM, then it compared the mechanical property, hygroscopicitiy and flexural strength retention rate of composite material before and after the plasma treatment. Results showed that the optimum treatment conditions of carbon fiber were 300W treatment power and 15-minute treatment time. Under the condition, the highest flexural strength value be increased by 19.55%.Saturated bibulous is low and bibulous rate is slow, flexural strength retention rate is 94.9%. And at the same time PES-C resin matrix can be strengthened, which will further improve the mechanical properties of composite materials.

Download Full-text

Flexural strength prediction models of non-prestressed Ultra-High Performance Concrete (UHPC) components

Structures ◽

10.1016/j.istruc.2021.10.047 ◽

2021 ◽

Vol 34 ◽

pp. 4532-4547

Author(s):

Antony Kodsy ◽

George Morcous

Keyword(s):

Flexural Strength ◽

High Performance ◽

Prediction Models ◽

High Performance Concrete ◽

Strength Prediction ◽

Ultra High Performance Concrete

Download Full-text

Microstructure and Properties of SCE-Al2O3/PES-MBAE Composite

Journal of Nanomaterials ◽

10.1155/2014/356273 ◽

2014 ◽

Vol 2014 ◽

pp. 1-8 ◽

Cited By ~ 5

Author(s):

Yufei Chen ◽

Qiwang Dai ◽

Xiwang Zhang ◽

Tao Feng

Keyword(s):

Dielectric Properties ◽

Bisphenol A ◽

Heat Resistance ◽

Bending Strength ◽

Sol Gel ◽

Harmful Effect ◽

Decomposition Temperature ◽

Two Phase ◽

Allyl Compound

SCE-Al2O3was the nano-Al2O3modified by supercritical ethanol and the surface of SCE-Al2O3was coated with active group. 4,4′-diaminodiphenylmethane bismaleimide (MBMI) was used as matrix; 3,3′-diallyl bisphenol A (BBA) and bisphenol-A diallyl ether (BBE) were used as reactive diluent, polyethersulfone (PES) as toughening agent, and SCE-Al2O3as modifier; SCE-Al2O3/PES-MBAE nanocomposite was prepared through in situ sol-gel method. The mechanism of composite toughened by PES was observed and analyzed. FTIR indicated that the reaction between MBMI and allyl compound occurred and SCE-Al2O3had doped into the polymer matrix. SEM showed that PES particle was inlaid in matrix and presented as a two-phase structure in matrix. The heat resistance, dielectric properties, and mechanical properties of SCE-Al2O3/PES-MBAE nanocomposites were evaluated. The results showed that with the incorporation of PES, although the toughness of the material improved, the heat resistance and dielectric properties of material declined, meanwhile. The adulteration of SCE-Al2O3could remedy the harmful effect caused by PES, while the content of SCE-Al2O3was reasonable. The decomposition temperature, dielectric constant, and dielectric loss of composite were 441.23°C, 3.63 (100 Hz), and 1.52 × 10−3(100 Hz); the bending strength and impact strength were 129.22 MPa and 13.19 kJ/mm2, respectively, when the content of SCE-Al2O3was 3 wt% and PES was 5 wt%.

Download Full-text

Compressive and flexural strength of Ultra-High Performance Fibre Reinforced Concrete containing recycled rubber crumb

Sustainable Buildings and Structures ◽

10.1201/b19239-12 ◽

2015 ◽

pp. 65-70

Keyword(s):

Reinforced Concrete ◽

Flexural Strength ◽

High Performance ◽

Fibre Reinforced Concrete ◽

Rubber Crumb ◽

Recycled Rubber ◽

High Performance Fibre

Download Full-text

Dielectric properties of La/Mn codoped barium titanate ceramics

Facta universitatis - series Electronics and Energetics ◽

10.2298/fuee1602285p ◽

2016 ◽

Vol 29 (2) ◽

pp. 285-296 ◽

Cited By ~ 2

Author(s):

Vesna Paunovic ◽

Vojislav Mitic ◽

Milos Marjanovic ◽

Ljubisa Kocic

Keyword(s):

Dielectric Properties ◽

Pechini Method ◽

Local Area ◽

Dissipation Factor ◽

Curie Constant ◽

Weiss Temperature ◽

Fine Grained ◽

Average Grain Size ◽

Titanate Ceramics ◽

La Doped

La/Mn codoped BaTiO3 ceramics with various La2O3 content, ranging from 0.3 to 1.0 at% La, were investigated regarding their microstructure and dielectric properties. The content of MnO2 was kept constant at 0.01 at% Mn in all samples. La/Mn codoped and undoped BaTiO3 were obtained by a modified Pechini method and sintered in air at 13000C for two hours. The homogeneous and completely fine-grained microstructure with average grain size from 0.5 to 1.5mm was observed in samples doped with 0.3 at% La. In high doped samples, apart from the fine grained matrix, the appearance of local area with secondary abnormal grains was observed. The dielectric properties were investigated as a function of frequency and temperature. The dielectric permittivity of the doped BaTiO3 was in the range of 3945 to 12846 and decreased with an increase of the additive content. The highest value for the dielectric constant at room temperature (er= 12846) and at the Curie temperature (er= 17738) were measured for the 0.3 at% La doped samples. The dissipation factor ranged from 0.07 to 0.62. The Curie constant (C), Curie-Weiss temperature (T0) and critical exponent (g) were calculated using the Curie-Weiss and the modified Curie-Weiss law. The highest values of Curie constant (C=3.27?105 K) was measured in the 1.0 at% La doped samples. The obtained values for g ranged from 1.04 to 1.5, which pointed out the sharp phase transformation from the ferroelectric to the paraelectric phase.

Download Full-text