Synthesis of novel phosphonium bromide‐montmorillonite nanocompound and its performance in flame retardancy and dielectric properties of epoxy resins

2020 ◽  
Author(s):  
Jianyu Qin ◽  
Wenchao Zhang ◽  
Rongjie Yang
Keyword(s):  
Dielectric Properties ◽  
Flame Retardancy ◽  
Epoxy Resins ◽  
Phosphonium Bromide

scholarly journals Investigation of the functional network modifier loading on the stoichiometric ratio of epoxy resins and their dielectric properties

2021 ◽  
Author(s):  
Istebreq A. Saeedi ◽  
Sunny Chaudhary ◽  
Thomas Andritsch ◽  
Alun S. Vaughan
Keyword(s):  
Glass Transition ◽  
Dielectric Properties ◽  
Electrical Properties ◽  
Epoxy Resins ◽  
Functional Network ◽  
Cross Linking ◽  
Network Modifier ◽  
Epoxy Resin System ◽  
The Cross ◽  
The Impact

AbstractReactive molecular additives have often been employed to tailor the mechanical properties of epoxy resins. In addition, several studies have reported improved electrical properties in such systems, where the network architecture and included function groups have been modified through the use of so-called functional network modifier (FNM) molecules. The study reported here set out to investigate the effect of a glycidyl polyhedral oligomeric silsesquioxane (GPOSS) FNM on the cross-linking reactions, glass transition, breakdown strength and dielectric properties of an amine-cured epoxy resin system. Since many previous studies have considered POSS to act as an inorganic filler, a key aim was to consider the impact of GPOSS addition on the stoichiometry of curing. Fourier transform infrared spectroscopy revealed significant changes in the cross-linking reactions that occur if appropriate stoichiometric compensation is not made for the additional epoxide groups present on the GPOSS. These changes, in concert with the direct effect of the GPOSS itself, influence the glass transition temperature, dielectric breakdown behaviour and dielectric response of the system. Specifically, the work shows that the inclusion of GPOSS can result in beneficial changes in electrical properties, but that these gains are easily lost if consequential changes in the matrix polymer are not appropriately counteracted. Nevertheless, if the system is appropriately optimized, materials with pronounced improvements in technologically important characteristics can be designed.

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

Design, synthesis, flame retardancy and dielectric properties of novel aromatic hyperbranched benzoxazine

2021 ◽  
pp. 105098
Author(s):  
Wanan Cai ◽  
Hailin Wen ◽  
Zhicheng Wang ◽  
Huimin Lu ◽  
Huibo Liu ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Flame Retardancy ◽  
Design Synthesis

scholarly journals A bio-based phosphaphenanthrene-containing derivative modified epoxy thermosets with good flame retardancy, high mechanical properties and transparency

RSC Advances ◽  
2021 ◽  
Vol 11 (49) ◽  
pp. 30943-30954
Author(s):  
Wei Peng ◽  
Yu-xuan Xu ◽  
Shi-bin Nie ◽  
Wei Yang
Keyword(s):  
Mechanical Properties ◽  
Flame Retardant ◽  
Flame Retardancy ◽  
Epoxy Resins ◽  
Flame Retardants ◽  
The Past ◽  
Phosphorus Containing ◽  
Modified Epoxy

Phosphorus-containing flame retardants have received huge interest for improving the flame retardant behavior of epoxy resins (EP) over the past few decades.

scholarly journals Effect of crosslink structure on mechanical properties, thermal stability and flame retardancy of natural flavonoid based epoxy resins

2021 ◽  
pp. 110898
Author(s):  
Yonggang Du ◽  
Ge Zhao ◽  
Gonghui Shi ◽  
Yiming Wang ◽  
Wei Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Flame Retardancy ◽  
Epoxy Resins

Synthesis of a phosphorus–nitrogen-containing flame retardant and its application in epoxy resin

2018 ◽  
Vol 31 (2) ◽  
pp. 186-196 ◽  
Author(s):  
Shuang Yang ◽  
Yefa Hu ◽  
Qiaoxin Zhang
Keyword(s):  
Heat Release ◽  
Flame Retardant ◽  
Epoxy Resin ◽  
Heat Release Rate ◽  
Flame Retardancy ◽  
Release Rate ◽  
Epoxy Resins ◽  
Proton Nuclear Magnetic Resonance ◽  
Scanning Calorimetry ◽  
Cone Calorimeter Test

In this article, a phosphorus–nitrogen-containing flame retardant (DOPO-T) was successfully synthesized by nucleophilic substitution reaction between 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and cyanuric chloride. The chemical structure of DOPO-T was characterized by Fourier transform infrared spectroscopy, proton nuclear magnetic resonance (NMR) and phosphorous-31 NMR, and elemental analysis. DOPO-T was then blended with diglycidyl ether of bisphenol-A to prepare flame-retardant epoxy resins. Thermal properties, flame retardancy, and combustion behavior of the cured epoxy resins were evaluated by differential scanning calorimetry, thermogravimetric analysis, limited oxygen index (LOI) measurement, UL94 vertical burning test, and cone calorimeter test. The results indicated that the glass transition temperature ( Tg) and temperature at 5% weight loss of epoxy resin (EP)/DOPO-T thermosets were gradually decreased with the increasing content of DOPO-T. DOPO-T catalyzed the decomposition of EP matrix in advance. The flame-retardant performance of EP thermosets was significantly enhanced with the addition of DOPO-T. EP/DOPO-T-0.9 sample had an LOI value of 36.2% and achieved UL94 V-1 rating. In addition, the average of heat release rate, peak of heat release rate, average of effective heat of combustion, and total heat release (THR) of EP/DOPO-T-0.9 sample were decreased by 32%, 48%, 23%, and 31%, respectively, compared with the neat EP sample. Impressively, EP/DOPO-T thermosets acquired excellent flame retardancy under low loading of flame retardant.

scholarly journals Hyperbranched phosphorus flame retardants: multifunctional additives for epoxy resins

2019 ◽  
Vol 10 (31) ◽  
pp. 4346-4358 ◽  
Author(s):  
Alexander Battig ◽  
Jens C. Markwart ◽  
Frederik R. Wurm ◽  
Bernhard Schartel
Keyword(s):  
Flame Retardancy ◽  
Epoxy Resins ◽  
Flame Retardants ◽  
Hyperbranched Polymers ◽  
Multifunctional Additives

Novel phosphorus-based hyperbranched polymers provide multifunctional flame retardancy to epoxy resins.

scholarly journals CNT modified layered α-MnO2 hybrid flame retardants: preparation and their performance in the flame retardancy of epoxy resins

RSC Advances ◽  
2020 ◽  
Vol 10 (46) ◽  
pp. 27408-27417
Author(s):  
Xiaodong Qian ◽  
Congling Shi ◽  
Jingyun Jing
Keyword(s):  
Flame Retardancy ◽  
Epoxy Resins ◽  
Flame Retardants ◽  
One Pot

In this paper, CNT modified layered α-MnO2 hybrid flame retardants (α-MnO2–CNTs) were synthesized through one-pot preparation.

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