scholarly journals PPG-Terminated Tetra-Carbamates as the Toughening Additive for Bis-A Epoxy Resin

Polymers ◽  
2019 ◽  
Vol 11 (9) ◽  
pp. 1522
Author(s):  
Ming Zhang ◽  
Mingqing Chen ◽  
Zhongbin Ni
Keyword(s):  
Epoxy Resin ◽  
Epoxy Matrix ◽  
Microphase Separation ◽  
Intramolecular Interactions ◽  
Hexamethylene Diisocyanate ◽  
Separation Mechanism ◽  
Toughening Mechanism ◽  
The Impact ◽  
Modified Epoxy ◽  
Epoxy Systems

We synthesized PPG-terminated tetra-carbamates as a new toughening additive for epoxy thermosets through facile addition reaction of hexamethylene diisocyanate (HDI) with poly(tetra-methylene glycols) (PTMG) and poly(propylene glycols) (PPG). The effects of prepared tetra-carbamates on the rheological behavior of neat epoxy resin were studied along with the various cured properties of their modified epoxy systems. Four carbamate groups (–NHCOO–) endow the prepared additives not only with good intramolecular interactions, but also with optimal intermolecular interactions with epoxy polymers. This results in the suitable miscibility of the additives with the epoxy matrix for the formation of the typical biphasic structure of microparticles dispersed in the epoxy matrix via polymerization-induced microphase separation. The impact strength and critical stress concentration factor (KIC) of cured modified epoxy systems with the additives are significantly higher than those of unmodified epoxy systems, without sacrificing the processability (Tg) and flexural strength. The toughening mechanism is understood as a synergism combination among the phase separation mechanism, the in situ homogeneous toughening mechanism, and the particle cavitation mechanism.

Curing Behavior of Epoxy Resin Mixed with Epoxypropoxypropyl Terminated Polydimethylsiloxane

2013 ◽  
Vol 677 ◽  
pp. 197-200
Author(s):  
Zheng Xi ◽  
Jin Dian Ding ◽  
Wen Jun Gan ◽  
Zhao Zhang
Keyword(s):  
Differential Scanning Calorimetry ◽  
Bisphenol A ◽  
Microphase Separation ◽  
Curing Kinetics ◽  
Diglycidyl Ether ◽  
Separation Mechanism ◽  
Scanning Calorimetry ◽  
Modified Epoxy ◽  
Epoxy Systems ◽  
Electronic Microscope

Diglycidyl ether of bisphenol A (DGEBA) and epoxypropoxypropyl terminated polydimethylsiloxane (ETDMS) were mixed in different proportion. The morphology of ETDMS modified epoxy systems was observed by scanning electronic microscope (SEM). Curing kinetics was also studied by differential scanning calorimetry (DSC). It was suggested that the formation of the microstructures followed reaction-induced microphase separation mechanism.

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.

Preparation and Mechanical Properties of Epoxy Resin Reinforced with Jeffamines-Grafted Carbon Nanotubes

2009 ◽  
Vol 79-82 ◽  
pp. 553-556 ◽  
Author(s):  
Ling Fei Shi ◽  
Gang Li ◽  
Gang Sui ◽  
Xiao Ping Yang
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Epoxy Resin ◽  
Photoelectron Spectroscopy ◽  
Epoxy Matrix ◽  
Resin Matrix ◽  
Mechanical And Thermal Properties ◽  
Time Dynamic ◽  
Multi Walled Carbon Nanotubes ◽  
The Impact

The increasing proliferation and application of advanced polymer composites requires higher and broader performance resin matrices. Poly(oxypropylene) with –NH2 end-groups has been widely used to toughen epoxy resins, but the strength of resin matrix may be reduced due to the addition of flexible segments in the crosslinking network. Carbon nanotubes (CNTs) have been paid more and more attention in recent years because of their superior thermal and mechanical properties. In this paper, CNTs grafted with Jeffamines T403 were used to simultaneously improve the reinforcement and toughening of an epoxy resin. The untreated multi-walled carbon nanotubes (u-MWNTs) were functionalized with amine groups according to three steps: carboxylation, acylation, and amidation. The f-MWNTs were characterized by Fourier transform infra-red (FTIR) and X-ray photoelectron spectroscopy (XPS). The experimental results indicated that the T403 was grafted to the surface of MWCNTs. The mechanical and thermal properties of epoxy with f-MWNTs were investigated. The tensile and flexural strength increased by 7.77 % and 7.03 % after adding 0.5wt% f-MWCNTs without sacrificing the impact toughness. At the same time, dynamic mechanical thermal analysis (DMTA) showed that the glass transition temperature (Tg) of epoxy with f-MWNTs were increased. The fracture surface of epoxy with f-MWNTs was observed by scanning electron microscopy (SEM) to understand the dispersion of f-MWNTs in epoxy matrix and interfacial adhesion between f-MWNTs and epoxy matrix, which can be attributed to the strong interfacial bonding between f-MWNTs and epoxy resin.

Studies on Mechanical and Thermal Properties of Epoxy Resin Modified by Fluorine-Containing Silicone

2013 ◽  
Vol 401-403 ◽  
pp. 713-716
Author(s):  
Cheng Fang ◽  
Dong Bo Guan ◽  
Wei Guo Yao ◽  
Shou Jun Wang ◽  
Hui An
Keyword(s):  
Glass Transition ◽  
Thermal Properties ◽  
Epoxy Resin ◽  
Bending Strength ◽  
Mechanical And Thermal Properties ◽  
Curing Agent ◽  
Epoxy System ◽  
Resin Curing ◽  
The Impact ◽  
Modified Epoxy

The epoxy resin was modified with the mixture of α,ω-dihydroxy poly-(3,3,3-trifluoropropyl) siloxane (PTFPMS), KH560 and stannous octoate. KH560 can react with PTFPMS and also epoxy resin curing agent. The two reactions were characterized by FI-IR. The modified epoxy resin was characterized by FI-IR. The result showed that fluorine-containing silicone had been successfully introduced into the epoxy system. The mechanical and thermal properties of the modified epoxy resin were analyzed. The results showed that with the increase of PTFPMS the impact strength of epoxy resin increased, hardness and bending strength correspondingly reduced, slight decrease in the glass transition temperature.

Morphology and Properties of Carbon Nanotubes Modified Epoxy

2011 ◽  
Vol 284-286 ◽  
pp. 918-922
Author(s):  
Xiao Lan Hu ◽  
Wen Hao Wang ◽  
Rong Lu Yu ◽  
Gang Liu ◽  
Teng Fei Lu
Keyword(s):  
Carbon Nanotubes ◽  
Thermal Properties ◽  
Epoxy Resin ◽  
Optical Microscopy ◽  
Epoxy Matrix ◽  
Amino Group ◽  
Matrix Composites ◽  
Elementary Analysis ◽  
Nanotube Dispersion ◽  
Modified Epoxy

Multi-walled carbon nanobutes (MWNTs) reinforced epoxy resin nanocomposites were fabricated by functionalizing the MWNTs with amino group. The functionlization of MWNTs was characterized by FTIR, elementary analysis, and TEM, and the MWNTs dispersion was characterized by optical microscopy and SEM. MWNTs functionalization with ethylene diamine improved the nanotube dispersion in the epoxy matrix composites. The dynamic mechanical thermal properties and thermal properties of MWNTs/epoxy nanocomposites are briefly discussed in terms of the MWNT loading and dispersion.

Influence Factors Study on the Properties of Epoxy Resin Modified by Polyurethane

2012 ◽  
Vol 472-475 ◽  
pp. 1937-1940
Author(s):  
Dong Yan Ren ◽  
Xiao Hong Li ◽  
Zhi Hua Li
Keyword(s):  
Tensile Strength ◽  
Thermal Properties ◽  
Impact Strength ◽  
Epoxy Resin ◽  
Influence Factors ◽  
Mechanical And Thermal Properties ◽  
Thermal Properties Of Materials ◽  
Properties Of Materials ◽  
The Impact ◽  
Modified Epoxy

Polyurethane-modified epoxy resin was prepared with Polyurethane prepolymer(PUP). The effects of the PUP content and epoxy resin type on mechanical and thermal properties of materials were discussed. The results indicate that the tensile strength and impact strength of the material increase to maximum successively, and then decrease with the increasing addition of PUP. When the mass fraction of PUP was 15%, the tensile strength and the impact strength of materials were all the best. There were significant differences in mechanical and thermal properties of material for different epoxy, and the best results were cured epoxy TDE-85.

Precision Parts Are Cast From Epoxy Resin Systems

CORROSION ◽  
1960 ◽  
Vol 16 (1) ◽  
pp. 9-12
Keyword(s):  
Physical Properties ◽  
Epoxy Resin ◽  
Chemical Resistance ◽  
Modified Epoxy ◽  
Epoxy Systems

Abstract Briefly discusses physical properties and chemical resistance of basic epoxy systems. Also includes modified epoxy systems and laminated epoxy systems. Gives manufacture procedures for casting precision parts and lists some applications. 6.6.8

Modification of Epoxy Resin Using Liquid Natural Rubber

2006 ◽  
Vol 517 ◽  
pp. 272-274 ◽  
Author(s):  
Ismail Zainol ◽  
Mohamad Ibrahim Ahmad ◽  
Fadzil Ayad Zakaria ◽  
Anita Ramli ◽  
Haslan Fadli Ahmad Marzuki ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Natural Rubber ◽  
Epoxy Resin ◽  
Average Particle Size ◽  
Sem Analysis ◽  
Average Particle ◽  
Uniform Dispersion ◽  
Liquid Natural Rubber ◽  
The Impact ◽  
Modified Epoxy

The cure process and the mechanical properties of liquid polymethylmethacrylate grafted natural rubber (LMG30) modified epoxy have been studied. Addition of LMG30 significantly increased the fracture toughness and the impact strength of the epoxy resin. The fracture toughness increased up to 22 fold (17.3 MNm-3/2) when modified with 5 phr LMG30. The glass transition temperature however, decreases as the rubber content increases. The SEM analysis shows uniform dispersion of rubber particles within the epoxy matrix with average particle size between 0.4 to 0.8 0m in diameter.

scholarly journals Impact Strength of Hybrid Epoxy–Basalt Composites Modified with Mineral and Natural Fillers

2021 ◽  
Vol 5 (3) ◽  
pp. 56
Author(s):  
Danuta Matykiewicz ◽  
Mateusz Barczewski ◽  
Marwan Suleiman Mousa ◽  
Mavinkere Rangappa Sanjay ◽  
Suchart Siengchin
Keyword(s):  
Impact Strength ◽  
Epoxy Resin ◽  
Epoxy Matrix ◽  
Basalt Fiber ◽  
Fiber Reinforced Composites ◽  
Maximum Force ◽  
Reinforced Composites ◽  
The Impact ◽  
Natural Fillers ◽  
Natural Additives

The aim of this study was to evaluate the influence of mineral and natural additives (2.5; 5; 10 wt.%) on the impact strength of epoxy–basalt composites. Three types of filler were used to modify the epoxy matrix: basalt powder (BP), basalt microfiber (BF) and sunflower husk ash (SA). The impact strength and the maximum force were determined for the materials. The results of the conducted research confirm that the addition of a powder fillers to the epoxy matrix of basalt fiber reinforced composites is an effective method of improving their impact characteristic. The introduction of fillers to epoxy resin allowed to improve the impact properties of all tested groups of laminates. Moreover, in all cases, the introduction of the filler increased the maximum force needed to damage the composite sample and their hardness. For the modified materials, an increase in impact strength was recorded, respectively: by 44% for composites with BP, by 7.5% for composites with BF and by 2.5% for composites with SA.

Reinforcement of Epoxy Resin by Lignin

2021 ◽  
Vol 1033 ◽  
pp. 151-155
Author(s):  
Supicha Piyanirund ◽  
Wichudaporn Seangyen ◽  
Penjit Srinoppakhun ◽  
Peerapan Dittanet
Keyword(s):  
Epoxy Resin ◽  
Filler Content ◽  
Diglycidyl Ether ◽  
Spherical Particles ◽  
Thermal And Mechanical Properties ◽  
Reinforcement Effect ◽  
Chain Mobility ◽  
Maximum Value ◽  
The Impact ◽  
Epoxy Systems

Diglycidyl ether of bisphenol A (DGEBA) epoxy resin with cycloaliphatic polyamine curing agent was modified with lignin to improve thermal and mechanical properties of of polymer composite. A systematic study of lignin loading, between 5 and 20 phr (per hundred parts resin) as compared to neat epoxy, was conducted for the reinforcement effect of epoxy resin composites. With the as-received lignin having spherical particles of 80 to 100 microns in diameter, the Tg of the epoxy-filler composites increased with a small addition of lignin up to 10 phr. Likewise, the yield stress and stiffness (Young’s modulus) of the epoxy resin-lignin composites significantly increased to a maximum value of 49.32 MPa and 2.75 GPa, respectively, with 10 phr lignin, due to the higher modulus of the filler compared to the bulk epoxy resin. Correspondingly, the storage moduli of the lignin-containing composites also increased upon filler addition up to 10 phr due to the impact of lignin. Conversely, however, the tanδ decreased in intensity with increasing lignin filler content, which reflects the dampening effect due to restricted chain mobility in thepresence of lignin particlesin epoxy systems.

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