A (4‐fluorophenyl)(phenyl)phosphine oxide‐modified epoxy resin with improved flame‐retardancy, hydrophobicity, and dielectric properties

2021 ◽  
pp. 50792
Author(s):  
Haodong Duan ◽  
Xiaolei Xu ◽  
Kangwei Leng ◽  
Sheng Zhang ◽  
Yuxi Han ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Epoxy Resin ◽  
Phosphine Oxide ◽  
Flame Retardancy ◽  
Modified Epoxy

Mechanical and Dielectric Properties of NiZn Ferrite Powders-CTBN Modified Epoxy Resin Coatings

2011 ◽  
Vol 50 (6) ◽  
pp. 568-572 ◽  
Author(s):  
Wei-Sheng Chen ◽  
Yu-Lun Chang ◽  
Hsing-I. Hsiang ◽  
Fu-Chi Hsu ◽  
Yun-Hwei Shen ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Epoxy Resin ◽  
Modified Epoxy

Flame-retardant halogen-free polymers using phosphorylated hexaglycidyl epoxy resin

2017 ◽  
Vol 30 (2) ◽  
pp. 202-210 ◽  
Author(s):  
Rasool Kheyrabadi ◽  
Hossein Rahmani ◽  
S Heydar Mahmoudi Najafi
Keyword(s):  
Flame Retardant ◽  
Epoxy Resin ◽  
Phosphine Oxide ◽  
Flame Retardancy ◽  
High Performance ◽  
Liquid Chromatography Mass Spectrometry ◽  
Scanning Calorimetry ◽  
Epoxy Monomer ◽  
Ul 94 ◽  
Halogen Free

Flame-retardant halogen-free epoxy resin, containing phosphorus and nitrogen atoms in the main chain, was synthesized through the curing of tris(3-(bis(oxiran-2-ylmethyl)amino)phenyl)phosphine oxide (HGE, hexaglycidyl epoxy monomer), starting from tris(3-aminophenyl) phosphine oxide (TAPO) and epichlorohydrin. The molecular structure of HGE with molecular weight 660 was confirmed using Fourier transform infrared, nuclear magnetic resonance, and liquid chromatography–mass spectrometry techniques. Epoxy equivalent weight determined by titration method was 120. The thermal curing behavior of the HGE/TAPO was investigated by differential scanning calorimetry. An intense exotherm due to curing reaction was observed in the temperature range from 123°C to 215°C. The HGE cured with TAPO, 4,4′-diaminodiphenylsulfone (DDS), and 1,5-diaminonaphthalene (DAN) and the thermal behaviors were studied by thermogravimetric analysis. The flame retardancy properties of the HGE/TAPO, DDS, and DAN were evaluated by vertical burning test (UL-94 V). The high performance cured epoxy resins showed high thermal stability and UL-94 V-0 flame retardancy rating.

A novel nanosilica/graphene oxide hybrid and its flame retarding epoxy resin with simultaneously improved mechanical, thermal conductivity, and dielectric properties

2015 ◽  
Vol 3 (18) ◽  
pp. 9826-9836 ◽  
Author(s):  
Rui Wang ◽  
Dongxian Zhuo ◽  
Zixiang Weng ◽  
Lixin Wu ◽  
Xiuyan Cheng ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Thermal Stability ◽  
Graphene Oxide ◽  
Dielectric Properties ◽  
Epoxy Resin ◽  
Flame Retardancy

A novel nanosilica/graphene oxide hybrid was prepared, which can simultaneously improve the typical properties (dielectric, thermal conductivity, thermal stability, and mechanical properties) and flame retardancy of epoxy resin.

Thermal stability and flame retardancy of an epoxy resin modified with phosphoric triamide and glycidyl POSS

2019 ◽  
Vol 31 (9-10) ◽  
pp. 1217-1225 ◽  
Author(s):  
Jialiang Li ◽  
Hongyu Wang ◽  
Shichao Li
Keyword(s):  
Thermal Stability ◽  
Epoxy Resin ◽  
Flame Retardancy ◽  
Differential Scanning Calorimetric ◽  
Char Residue ◽  
Electron Microscopic ◽  
Compact Structure ◽  
Limiting Oxygen Index ◽  
Phosphoric Triamide ◽  
Modified Epoxy

Phosphoric triamide (PTA) and glycidyl polyhedral oligomeric silsesquioxane (POSS) were simultaneously incorporated into the cured network of a bisphenol F epoxy resin and 4,4′-diaminodiphenyl methane (DDM) to improve the thermal stability and flame retardancy. PTA was synthesized by triethyl phosphate and DDM, and its chemical structure was confirmed by 1H nuclear magnetic resonance (NMR) and Fourier transform infrared (FTIR). The differential scanning calorimetric (DSC) results showed that the introduction of PTA and POSS slightly increased the glass transition temperature of the epoxy resin. The thermogravimetric analysis results indicated that compared with the pure, phosphoric, and silicic epoxy resins, the modified epoxy resin possessed the lowest weight loss rate and highest char residue. Its limiting oxygen index value was as high as 30.5, and the UL-94 grade reached V-1. A decomposition test was carried out to obtain sufficient char residue and investigate the condensed mechanism. The scanning electron microscopic images demonstrated that the char residue of the modified epoxy resin had a compact structure. The energy dispersive X-ray and FTIR analyses verified the synergistic effect of the phosphorus and silicon in the PTA and POSS, respectively, on the epoxy resin.

Flame retardancy and thermal properties of organoclay and phosphorous compound synergistically modified epoxy resin

2016 ◽  
Vol 133 (18) ◽  
pp. n/a-n/a ◽  
Author(s):  
Zixiang Weng ◽  
T. Senthil ◽  
Dongxian Zhuo ◽  
Lijun Song ◽  
Lixin Wu
Keyword(s):  
Thermal Properties ◽  
Epoxy Resin ◽  
Flame Retardancy ◽  
Modified Epoxy

The Mechanical Properties of Organic Modified Epoxy Resin

2020 ◽  
Vol 43 (3) ◽  
pp. 10-14
Author(s):  
Georgel MIHU ◽  
Claudia Veronica UNGUREANU ◽  
Vasile BRIA ◽  
Marina BUNEA ◽  
Rodica CHIHAI PEȚU ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Composite Materials ◽  
Epoxy Resin ◽  
Epoxy Matrix ◽  
Epoxy Resins ◽  
Mechanical Tests ◽  
Organic Modification ◽  
Three Point Bending ◽  
Modified Epoxy

Epoxy resins have been presenting a lot of scientific and technical interests and organic modified epoxy resins have recently receiving a great deal of attention. For obtaining the composite materials with good mechanical proprieties, a large variety of organic modification agents were used. For this study gluten and gelatin had been used as modifying agents thinking that their dispersion inside the polymer could increase the polymer biocompatibility. Equal amounts of the proteins were milled together and the obtained compound was used to form 1 to 5% weight ratios organic agents modified epoxy materials. To highlight the effect of these proteins in epoxy matrix mechanical tests as three-point bending and compression were performed.

scholarly journals Hydrophobic Modification of Graphene Oxide and Its Effect on the Corrosion Resistance of Silicone-Modified Epoxy Resin

Metals ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 89
Author(s):  
Wei Yuan ◽  
Qian Hu ◽  
Jiao Zhang ◽  
Feng Huang ◽  
Jing Liu
Keyword(s):  
Contact Angle ◽  
Corrosion Resistance ◽  
Graphene Oxide ◽  
Physical Properties ◽  
Epoxy Resin ◽  
Electrochemical Impedance ◽  
Salt Spray ◽  
X Ray ◽  
Modified Graphene Oxide ◽  
Modified Epoxy

This study modified graphene oxide (GO) with hydrophilic octadecylamine (ODA) via covalent bonding to improve its dispersion in silicone-modified epoxy resin (SMER) coatings. The structural and physical properties of ODA-GO were characterized by field-emission scanning electron microscopy (FE-SEM), X-ray diffraction analysis (XRD), Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and contact angle tests. The ODA-GO composite materials were added to SMER coatings by physical mixing. FE-SEM, water absorption, and contact angle tests were used to evaluate the physical properties of the ODA-GO/SMER coatings, while salt spray, electrochemical impedance spectroscopy (EIS), and scanning Kelvin probe (SKP) methods were used to test the anticorrosive performance of ODA-GO/SMER composite coatings on Q235 steel substrates. It was found that ODA was successfully grafted onto the surfaces of GO. The resulting ODA-GO material exhibited good hydrophobicity and dispersion in SMER coatings. The anticorrosive properties of the ODA-GO/SMER coatings were significantly improved due to the increased interfacial adhesion between the nanosheets and SMER, lengthening of the corrosive solution diffusion path, and increased cathodic peeling resistance. The 1 wt.% ODA-GO/SMER coating provided the best corrosion resistance than SMER coatings with other amounts of ODA-GO (including no addition). After immersion in 3.5 wt.% NaCl solution for 28 days, the low-frequency end impedance value of the 1 wt.% ODA-GO/SMER coating remained high, at 6.2 × 108 Ω·cm2.

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