Effect of 120 keV proton irradiation on mass loss and chemical structure of AG-80 epoxy resin

2010 ◽  
Vol 165 (11) ◽  
pp. 857-867 ◽  
Author(s):  
Yu Gao ◽  
Sheng-Ling Jiang ◽  
Shang-Li Dong ◽  
De-Zhuang Yang
Keyword(s):  
Mass Loss ◽  
Epoxy Resin ◽  
Chemical Structure ◽  
Proton Irradiation

scholarly journals The application of a phosphorus nitrogen flame retardant curing agent in epoxy resin

e-Polymers ◽  
2019 ◽  
Vol 19 (1) ◽  
pp. 545-554 ◽  
Author(s):  
Anxin Li ◽  
Pingli Mao ◽  
Bing Liang
Keyword(s):  
Flame Retardant ◽  
Epoxy Resin ◽  
Adhesive Strength ◽  
Chemical Structure ◽  
Phosphorus Content ◽  
Raw Material ◽  
Curing Agent ◽  
Thermal Degradation Behavior ◽  
Overall Performance ◽  
The Impact

AbstractIn order to improve the compatibility of flame retardant and epoxy resin, a phosphorus nitrogen flame retardant curing agent poly(p-xylylenediamine spirocyclic pentaerythritol bisphosphonate) (PPXSPB) was synthesized. FTIR, 1HNMR, and mass spectroscopy were used to identify the chemical structure of PPXSPB. Epoxy resin (E-44) and PPXSPB as the raw material, a series of thermosetting systems were prepared. The effects of PPXSPB on flame retardancy, water resistance, thermal degradation behavior, mechanical properties and the adhesive strength of EP/PPXSPB thermosets were investigated. The results show that with the increase of phosphorus content, the oxygen index and carbon residue of the system both increased significantly, and the heat release rate gradually decreased, which is of great significance in delaying the occurrence of fire. When the phosphorus content is 3.24% in EP/PPXSPB thermosets, EP-2 can successfully pass the UL94 V-0 flammability rating, the LOI value of EP-2 can reach 31.4%, the impact strength and tensile strength was 6.58 kJ/m2 and 47.10 MPa respectively, and the adhesive strength was 13.79 MPa, the system presents a good overall performance.

scholarly journals Increasing the strength of destroyed wood of wooden architecture monuments by surface modification

2018 ◽  
Vol 251 ◽  
pp. 01034 ◽  
Author(s):  
Elena Pokrovskaya
Keyword(s):  
Surface Modification ◽  
Mass Loss ◽  
Water Absorption ◽  
Epoxy Resin ◽  
Surface Coating ◽  
Hydroxyl Groups ◽  
Layer Surface ◽  
Anglican Church ◽  
Covalent Bonds ◽  
Resin Solution

The Anglican Church in Arkhangelsk built in 1833 represents a wooden architecture monument. The article describes the strengthening of partially destroyed samples of the Anglican Church wood by surface modification. The first layer of the sandwich coating is nitrilotrimethylphosphonic acid, which forms covalent bonds with the substrate, partially strengthening the wood. The second layer is an epoxy resin solution, which forms covalent bonds with the coating of the first layer, with hydroxyl groups of the first layer involved in the curing of the second layer as well. A two-layer surface coating is formed, while the strength of the wood increases by 2 – 2.5 times, water absorption decreases by 3 times, and mass loss in combustion is no more than 9% according to GOST 27484-87. The monument preservation increases.

scholarly journals Radiation chemistry of molecular compounds and polymers by soft X-ray spectroscopy and microscopy

2017 ◽  
Vol 95 (11) ◽  
pp. 1191-1197
Author(s):  
Jianjun Yang ◽  
Jian Wang
Keyword(s):  
Mass Loss ◽  
Chemical Structure ◽  
Molecular Complexes ◽  
Large Mass ◽  
Radiation Chemistry ◽  
Edge Structure ◽  
X Ray ◽  
Structure Changes ◽  
X Ray Absorption ◽  
Molecular Compounds

Soft X-ray-induced radiation chemistry in selected Fe molecular compounds and some aliphatic polymers was studied using soft X-ray absorption spectroscopy, and scanning transmission X-ray microscopy. X-ray absorption near-edge structure (XANES) spectroscopy was used to elucidate the radiation chemistry. The results show that damage to the Fe molecular complexes involves Fe-ligand bond breaking, ligand damage, and subsequent photoreduction of Fe(III) if it is not tightly bonded to oxygen. Upon radiation damage, polymer PAN primarily undergoes chemical structure changes without mass loss, PECA experiences chemical structure changes as well as small mass loss, while PPC and PEC suffer large mass loss with chemical structure changes. These studies are not only important to X-ray analysis of radiation sensitive materials but also are valuable to the applications of X-ray lithography and other types of nanofabrication involving photoresist.

Changes in mass loss and chemistry of AG-80 epoxy resin after 160keV proton irradiations

2005 ◽  
Vol 234 (3) ◽  
pp. 275-284 ◽  
Author(s):  
Yu Gao ◽  
Mingren Sun ◽  
Dezhuang Yang ◽  
Shiyu He ◽  
Jinhe Wang ◽  
...  
Keyword(s):  
Mass Loss ◽  
Epoxy Resin

Chemical Resistance of Concrete-Polymer Composites – Comparison Based on Experimental Studies

2015 ◽  
Vol 1129 ◽  
pp. 123-130 ◽  
Author(s):  
Tomasz Piotrowski ◽  
Piotr Gawroński
Keyword(s):  
Compressive Strength ◽  
Mass Loss ◽  
Epoxy Resin ◽  
Polymer Composites ◽  
Chemical Resistance ◽  
Experimental Studies ◽  
Polymer Concrete ◽  
Cement Concrete ◽  
Ordinary Concrete ◽  
Synthetic Latex

One of the main advantage of Concrete-Polymer Composites (C-PC) in relation to Cement Concrete called Ordinary Concrete is its chemical resistance. There is no European standard for testing the chemical resistance of cement based concretes and C-PC. American standards ASTM provide varied concrete tests depending on exposure conditions and mechanisms of destruction of concrete structures but there is a lack of clear criteria for the evaluation of research results by these methods. There are also requirements for monolithic floors chemical resistance - ASTM C722-04 and the requirements of the standard EN 1504-2, but they involve coating materials and cannot be directly applied to the cement concrete and C-PC. The paper presents the experimental studies of chemical resistance of C-PC in relation to OC. The investigations has been made under different environment conditions. First the samples of Ordinary Concrete (OC), Polymer Concrete (PC-1) based on vinylester resin and Polymer-Cement Concrete (PCC-1) with polyacrylic dispersion used as a co-binder were immersed for a period of time up to 168 days in a distilled water, H2SO4, MgSO4, (NH4)2SO4 and mix of the mentioned. During the storage the pH was controlled. Additionally as a reference the samples were conditioned in a climate chamber (20°C, 60% RH). The compressive strength were tested after defined periods of time. Next experiment was performed on OC and three different PCC – first modified with synthetic latex, second with polyacrylic polymer dispersion and the last with epoxy resin. The samples were immersed in H2SO4 up to 90 days. Compressive strength and mass loss after 30 and 90 days of conditioning were measured. As a reference the water immersion was used. The results obtained in this experimental program showed high chemical resistance of Polymer Concrete. PC samples obtained continuous increases of compressive strength in all examined chemically aggressive environments. It is also confirmed higher chemical resistance of Polymer-Cement Concrete modified with vinylester resin in relation to Ordinary Concrete. The second part of the program showed that the best additive to PCC among poliacrylic dispersion, synthetic latex and epoxy resin was last one. Epoxy modified PCC samples obtained best results both in compressive strength and mass loss tests

Study of Thermal Properties of Curing of DGEBA Epoxy Resin with Hexakis-(4-Aminophenoxy)-Cyclotriphosphazene

2011 ◽  
Vol 284-286 ◽  
pp. 365-368 ◽  
Author(s):  
Jing Zhu ◽  
Yong Wu ◽  
Lei Zhao ◽  
Hong Liang Wei ◽  
Hui Juan Chu ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Thermogravimetric Analysis ◽  
Epoxy Resin ◽  
Epoxy Resins ◽  
Chemical Structure ◽  
Diglycidyl Ether ◽  
Flame Retardance ◽  
Curing Agent ◽  
Degradation Behaviors ◽  
Curing Agents

Hexakis-(4-aminophenoxy)-cyclotriphosphazene (PN-NH2) was synthesized through nucleophilic substitution of the chloride atoms of hexachlorocyclotriphosphazene (HCCP) and reduction of the nitro group, and its chemical structure was characterized. As a curing agents for commercial epoxy resin Diglycidyl ether of bisphenol-A (DGEBA) PN-NH2 was compared with conventional curing agents 4,4-diaminodiphenylsulfone(DDS) and 4,4-diaminodiphenylmethane (DDM). The thermal properties and thermal degradation behaviors of these thermosetted resins were investigated by using thermogravimetric analysis (TGA). TGA studies demonstrated that the thermal properties of the PN-NH2-containing cured epoxy resin were higher than those of others. The phosphorus-nitrogen containing curing agent can result in a great improvement of the flame retardance for their thermosetted epoxy resins.

High energy proton irradiation stability and damage mechanism of shape-memory epoxy resin

2019 ◽  
Vol 28 (11) ◽  
pp. 115003
Author(s):  
Longyan Hou ◽  
Yiyong Wu ◽  
Debin Shan ◽  
Bin Guo ◽  
Yingying Zong
Keyword(s):  
Shape Memory ◽  
Epoxy Resin ◽  
Proton Irradiation ◽  
Damage Mechanism ◽  
High Energy ◽  
High Energy Proton ◽  
Energy Proton

Quantitative STEM imaging of electron beam induced mass loss of epoxy resin sections

2019 ◽  
Vol 202 ◽  
pp. 44-50 ◽  
Author(s):  
Radim Skoupy ◽  
Jana Nebesarova ◽  
Miroslav Slouf ◽  
Vladislav Krzyzanek
Keyword(s):  
Electron Beam ◽  
Mass Loss ◽  
Epoxy Resin

scholarly journals The Effect of Sizing Agent of Carbon Fibre on the Interface of Electron Beam Cured Composites

2011 ◽  
Vol 20 (6) ◽  
pp. 096369351102000
Author(s):  
Jianwen Bao ◽  
Ye Li ◽  
Xiangyu Zhong ◽  
Xiangbao Chen
Keyword(s):  
Mechanical Properties ◽  
Electron Beam ◽  
Carbon Fibre ◽  
Heat Resistance ◽  
Epoxy Resin ◽  
Chemical Structure ◽  
Carbon Fibres ◽  
Composite Properties ◽  
Properties Of Composites

To understand the effect of interface on the properties of electron beam cured composites, the composition and its chemical structure of the sizing agent of carbon fibres were investigated. The results show that there are alkali groups in the sizing agent of T300 and T800 carbon fibres, and these alkali groups react with the strong proton acids that are generated by the initiator and hinder the EB curing of cationic epoxy resin matrices. The properties of the composites of T300 and T800 carbon fibres cured by EB were poor. In the composites of T700, M40 and M40J carbon fibres, the effects of the sizing agent of the carbon fibres on the EB curing and the composite properties are less than for T300 and T800. After the carbon fibres were extracted by acetone, the properties of their composites improved. In particular, the heat-resistance and mechanical properties of composites of T300 and T800 carbon fibre increased greatly.

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