Synthesis of Latent Curing Agent for Epoxy Resin

2010 ◽  
Vol 150-151 ◽  
pp. 988-991
Author(s):  
Xue Jun Zhang ◽  
Su Mei Kang ◽  
Zhan Qing Liu
Keyword(s):  
Carbon Fiber ◽  
Epoxy Resin ◽  
Chemical Structure ◽  
Epoxy Composites ◽  
Curing Agent ◽  
High Modulus ◽  
Molar Ratios ◽  
Interlaminar Shear ◽  
Modified Epoxy ◽  
Carbon Fiber Epoxy

A new kind of latent curing agent (LCA) for epoxy resin was synthesized by the reaction of Ethylenediamine with Butylacrylate in equal molar ratios, and the chemical structure and thermal property of the LCA were studied with FTIR and TGA, respectively. Moreover, LCA was also used to modify the epoxy sizing agent for high modulus carbon fiber. The results show that the wettability of sized carbon fiber tends to increase due to the increase of the polymer film on the surface of the carbon fiber, and interlaminar shear strength (ILSS) of the sized high modulus carbon fiber/epoxy composites is improved to 78MPa, which is increased by 8.6% compared with the composites reinforced by high modulus carbon fiber with unmodified sizing agent, indicating that using LCA modified epoxy resin as polymer coating for carbon fiber is a feasible method to improve the interfacial performance of high modulus carbon fiber/epoxy composites.

Epoxy Modified Polyurethanes Coated High Modulus Carbon Fiber: Synthesis and Properties Studies

2011 ◽  
Vol 217-218 ◽  
pp. 728-733 ◽  
Author(s):  
Yan Hong Tian ◽  
Zhan Qing Liu ◽  
Su Mei Kang ◽  
Xue Jun Zhang
Keyword(s):  
Carbon Fiber ◽  
Raw Materials ◽  
Crosslinking Agent ◽  
Epoxy Composites ◽  
High Modulus ◽  
Coating Agent ◽  
Interlaminar Shear ◽  
Carbon Fiber Epoxy ◽  
Thermal Stability Of ◽  
Properties Of Composites

With toluene 2, 4-diisocyanate (TDI), polyethylene glycol (PEG) and 2,3-Epoxy-1-prop -anol (glycidol) used as the raw materials, two epoxy terminated polyurethanes (EPU) was synthesized by prepolymerization and closed end. Moreover, EPU with high toughhess is chosen as a coating agent for carbon fiber with three ethylene tetramine (TETA) as curing agen. The influence of the content of crosslinking agent in the coating layer on properties of composites and the mechanism of interface toughness are investigated. The chemical structure and thermal property of the EPU were studied with FTIR, 1HNMR and TGA, respectively. It proves that the thermal stability of EPU is more stable than epoxy coating. The interlaminar shear strength (ILSS) of the sized high modulus carbon fiber/epoxy composites is improved to 71MPa, which increased by 19.4% compared with the composites reinforced by unsized high modulus carbon fiber, and DMTA show that using EPU as a new kind of polymer coating for carbon fiber is a feasible method to improve the interfacial performance of high modulus carbon fiber/epoxy composites.

Effect of Ozone Treatment on the Interfacial Properties of High Modulus Carbon Fiber/Epoxy Composites

2007 ◽  
Vol 546-549 ◽  
pp. 1547-1550 ◽  
Author(s):  
Xiao Jin Zhao ◽  
Wei Qin ◽  
Ben Li Wang
Keyword(s):  
Shear Strength ◽  
Carbon Fiber ◽  
Fiber Surface ◽  
Interlaminar Shear Strength ◽  
Epoxy Composites ◽  
Ozone Treatment ◽  
High Modulus ◽  
Surface Impregnation ◽  
Interlaminar Shear ◽  
Carbon Fiber Epoxy

High modulus carbon/epoxy composites have been attached more and more importance in the aeronautic field. Because chemical inert of high modulus carbon fiber surface and its poor impregnation for resin, it is essential to improve its polarity in order to enhance the interfacial performances of high modulus carbon/epoxy composites. In this paper, high modulus carbon fiber was treated by ozone oxidation method to modify its surfacial properties. AFM and SEM were used to observe the surface of the carbon fiber, as well as interlaminar shear strength of high modulus carbon fiber/epoxy composite was tested. The impregnation and the interfacial performances of the high modulus carbon/epoxy composites were studied. The results show that after ozone treatment, the surface impregnation of high modulus carbon fiber and the interlaminar shear strength property of high modulus carbon/epoxy composites can be improved obviously.

Preparation of Sizing Agents for Carbon Fiber Adapt to Various Polymer Matrix

2011 ◽  
Vol 306-307 ◽  
pp. 750-753
Author(s):  
Juan Chen ◽  
Jian Ye Liu ◽  
Dong Zhi Wang ◽  
Xin Rui Zhou
Keyword(s):  
Carbon Fiber ◽  
Epoxy Resin ◽  
Abrasion Resistance ◽  
Vinyl Ester ◽  
Resin Composite ◽  
Reinforced Composite ◽  
Epoxy Resin Composite ◽  
Interlaminar Shear ◽  
Sizing Agents ◽  
Carbon Fiber Epoxy

Emulsion type sizing agent for carbon fiber was synthesized using epoxy resin (E-51) and epoxidized polybutadiene (EPB) by adding emulsifiers and other additives. Standing stabilization of sizing agents was analyzed. Meanwhile, abrasion resistance, fluffs and breakage, stiffness were used to analyze the processability of carbon fiber. The effect of sizing agents on interfacial adhesion of carbon fiber/resin composites was estimated by interlaminar shear strength (ILSS). The results showed that the sizing agent could significantly improve processability of carbon fiber due to the increase of abrasion resistance and reduce of fluffs and breakage. By adding EPB in sizing agent and adjusting the ratio to E-51, the flexibility of carbon fiber was ameliorated and the sizing agent could adapt to various resin matrices. Compared to the desized carbon fiber reinforced composite, ILSS of sized carbon fiber/epoxy resin composite was increased by 16.9%, and ILSS of sized carbon fiber/vinyl ester resin composite was enhanced by 19.1%.

DEGRADATION OF CARBON FIBER/EPOXY COMPOSITES BY XE LAMP AND HUMIDITY

2006 ◽  
Vol 20 (25n27) ◽  
pp. 3686-3691 ◽  
Author(s):  
XIAOJUN LV ◽  
QI ZHANG ◽  
GUOJUN XIE ◽  
GUANJIE LIU
Keyword(s):  
Shear Strength ◽  
Carbon Fiber ◽  
Epoxy Composite ◽  
Interlaminar Shear Strength ◽  
Epoxy Composites ◽  
Radiation Temperature ◽  
Transverse Tensile ◽  
Interlaminar Shear ◽  
Transverse Tensile Strength ◽  
Carbon Fiber Epoxy

In order to understand the effect of natural environmental factors on the carbon fiber/epoxy composites, the degradation of carbon fiber/epoxy composite was studied. The specimens were exposed in a Xe lamp chamber and suffered to ultraviolet light radiation, temperature and/or humidity conditions. The results show that the radiation, temperature and/or humidity could cause extensive corrosion to the surface and interior of the carbon/epoxy composite and attack the interface between matrix and carbon fiber, resulting in an obvious reduction of the transverse tensile strength and interlaminar shear strength. On the contrary, the longitudinal transverse shear strength was not affected much by the radiation, temperature and/or humidity. The results indicate that the radiation, temperature and/or humidity can result in the corrosion of the carbon/epoxy composite and consequently affect the mechanical properties of the carbon/epoxy composite partially.

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