Toughening Mechanism in Epoxy Resin Modified Recycled Rubber Based Composites Reinforced with Gamma-Alumina, Graphene and CNT

2018 ◽  
pp. 31-39
Author(s):  
A. B. Irez ◽  
E. Bayraktar ◽  
I. Miskioglu
Keyword(s):  
Epoxy Resin ◽  
Gamma Alumina ◽  
Toughening Mechanism ◽  
Recycled Rubber

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.

Thermoset Composite on Basis of Recycled Rubber

2013 ◽  
Vol 801 ◽  
pp. 67-73 ◽  
Author(s):  
Petr Valášek ◽  
Jozef Žarnovský ◽  
Miroslav Müller
Keyword(s):  
Epoxy Resin ◽  
Adhesive Properties ◽  
Micro Particles ◽  
Material Usage ◽  
Limited Company ◽  
Recycled Rubber ◽  
Thermoset Epoxy ◽  
Waste Handling

The paper describes the mechanical qualities of thermoset – epoxy resin filled with recycled rubber in the form of micro-particles. Such an application of waste can be regarded as material usage which should be preferred to other ways of waste handling. Micro-particles of recycled rubber affect the mechanical qualities of polymer in which they are dispersed. The paper quantifies cohesive and adhesive properties of the filled epoxy resin. Filling polymers – thermosets with waste fillers saves costs, it does not burden the environment, and it is inexpensive. The results described in this paper can lead to enlarging the application areas of recycled rubbers. As the filler, recycled rubber gained by the process of an ecological disposal of tyres by Gumoeko, s.r.o. (private limited company) was used.

Recycled Rubber Crumb as a Toughener of Polystyrene

1985 ◽  
Vol 58 (1) ◽  
pp. 97-106 ◽  
Author(s):  
M. Pittolo ◽  
R. P. Burford
Keyword(s):  
Particle Size ◽  
Fracture Morphology ◽  
Rubber Crumb ◽  
Toughening Mechanism ◽  
Minor Factor ◽  
Rubber Particles ◽  
Recycled Rubber ◽  
A Minor ◽  
Type Of Fracture ◽  
Toughening Agent

Abstract Our preliminary investigations indicate that recycled rubber crumb may be used as a toughening agent for brittle thermoplastic such as polystyrene. The toughness of the resultant materials was found to increase with increasing rubber-to-matrix adhesion and decreasing particle size. Although crazing is expected to play some role in the toughening mechanism, the absence of a yield point and the type of fracture morphology indicate it is only a minor factor It is suggested that the main contribution is from a crack bridging mechanism. The increased energy to break results from the rupture of the rubber particles. Further studies in which crumb with known tear strength and tensile properties is used as a filler are currently being carried out. It is hoped that this will lead to a clearer understanding of the toughening mechanism.

Study on Toughening of the Epoxy

2012 ◽  
Vol 624 ◽  
pp. 260-263
Author(s):  
Chun Fa Ouyang ◽  
Duo You Zhang ◽  
Qun Gao ◽  
Yu Tao Shi ◽  
Kang Sheng Zheng
Keyword(s):  
Shear Strength ◽  
Epoxy Resin ◽  
Phase Structure ◽  
Single Phase ◽  
Resin Composites ◽  
Toughening Mechanism ◽  
Two Phase ◽  
Breaking Elongation ◽  
Epoxy Resin Composites ◽  
The Impact

Abstract. The effect of styrene-The effect of hydroxy-terminated polybutadiene liquid rubber (HTPB) and softened agent on the performance of epoxy resin are studied. The mechanical properties of the composites investigated and the toughening mechanism were studied trough the SEM. In the HTPB/epoxy resin composites, the hardness is reduced but the elongation and the shear strength increased . Added 20wt%HTPB, the breaking elongation can be up to 16.19% and the shear strength rise to 13.74MPa. From the images of the SEM, the globular and trumpet-like hole and shear zone can hinder the development of the cracks, thus increasing the toughness of the epoxy resint. In the softened agent/epoxy resin composites, The addition of the softened agent, the breaking elongation and the impact strength have increased. From the images of SEM,we found that ,with the addition of the softened agent ,the single phase structure turns to two-phase structure and the bicontinuous phase and the brittle fracture turns to ductile fracture.

Toughening Mechanism of Liquid Crystalline Epoxy Resin with Spacers Outside the Mesogenic Group

2015 ◽  
Vol 609 (1) ◽  
pp. 80-92 ◽  
Author(s):  
Hisanao Yamamoto ◽  
Naoki Sakamoto ◽  
Akira Fujita ◽  
Miyuki Harada ◽  
Mitsukazu Ochi
Keyword(s):  
Epoxy Resin ◽  
Liquid Crystalline ◽  
Mesogenic Group ◽  
Toughening Mechanism ◽  
Liquid Crystalline Epoxy

Toughening Mechanism and the Application of Epoxy Adhesive Modified by Nano-SiO2

2012 ◽  
Vol 174-177 ◽  
pp. 834-837
Author(s):  
Xi Wang ◽  
S. R. Zheng ◽  
R. M. Wang
Keyword(s):  
Impact Strength ◽  
Epoxy Resin ◽  
Three Dimensional ◽  
Epoxy Adhesive ◽  
Toughening Mechanism ◽  
Pure Epoxy ◽  
Dimensional Network ◽  
Shearing Strength ◽  
System Resilience ◽  
Unmodified Epoxy

Epoxy resin adhesives are widely used in various sectors, particularly in the aerospace and automotive industries. However, the solidification of the three-dimensional network structure of pure epoxy resin, which causes greater density and brittleness, results in poor system resilience. With the ultimate goal of improving the resilience of epoxy resin, nano-sized SiO2particles were introduced to improve the adhesion strength of both modified and unmodified epoxy adhesive. The results indicated increases of shearing strength from 16.66-Mpa to 18.01 -Mpa, impact strength from 15.4-kJ/m2 to 33.68-kJ/m2, and flexural strength from 70.5-Mpa to 80.94 Mpa.

Sign in / Sign up

Export Citation Format

Share Document