Development of a Methanol Resistant Epoxy Coating

2013 ◽  
Vol 634-638 ◽  
pp. 2939-2944
Author(s):  
Xiao Ping Liu ◽  
Tian Liang Zheng
Keyword(s):  
Crosslink Density ◽  
Volume Concentration ◽  
Oil Absorption ◽  
Resin System ◽  
Absorption Method ◽  
Experiment Data ◽  
Pigment Volume Concentration ◽  
Epoxy Resin System ◽  
The Impact ◽  
Dry Film

The thesis shows the impact of the epoxy resin system crosslink density on the coating’s methanol resistance. The oil absorption method critical pigment volume concentration (CPVC ) value and the dry film density method CPVC value were compared for the single pigment. The mixed pigments coating’s CPVC was calculated from the single pigment CPVC and compared with the experiment data. The methanol resistance of different relative PVC (λ) coatings was compared. The result showed that the coating with λ less and close to 1 revealed the best methanol resistance.

Enhanced toughness and shape memory behaviors of toughed epoxy resin

2012 ◽  
Vol 24 (8) ◽  
pp. 702-709 ◽  
Author(s):  
Chun-Hua Zhang ◽  
Hui-Ge Wei ◽  
Yu-Yan Liu ◽  
Hui-Feng Tan ◽  
Zhanhu Guo
Keyword(s):  
Impact Strength ◽  
Shape Memory ◽  
Epoxy Resin ◽  
Neat Epoxy ◽  
Resin Matrix ◽  
Polypropylene Glycol ◽  
Resin System ◽  
Shape Memory Behavior ◽  
Epoxy Resin System ◽  
The Impact

This paper reports on an approach to enhance the toughness of shape memory epoxy by using polypropylene glycol diglycidyl ether (G) as the toughening agent. The mechanical properties and shape memory behavior of the toughened resin systems with different loading level of G were studied, respectively. Results of the torsional braid analysis (TBA) test indicated that G had good compatibility with the epoxy resin matrix and induced a decrease in the glass transition temperature, Tg, of the toughened systems when compared to that of the neat resin system; and the decrease in Tg scaled with the content of G added in the system. Impact strength tests showed that the impact strength was improved significantly by adding G into the resin system and it increased by a factor of 13.7 for the system with 13 wt.% content of G. In addition, the toughened systems were found to yield during the impact strength test whereas brittle fracture occurred for the neat epoxy resin system; this behavior could be further confirmed by the results of scanning electron microscopy (SEM). In the shape memory behavior tests, strain fixity ratio reached as high as 98.9% for toughened systems with 7, 9, 11, 13, and 15 wt.% of G. Toughened systems also displayed changed shape recovery behavior that was comparable with that of the neat epoxy resin system during shape memory process.

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.

scholarly journals Triblock Copolymer Toughening of a Carbon Fibre-Reinforced Epoxy Composite for Bonded Repair

Polymers ◽  
2018 ◽  
Vol 10 (8) ◽  
pp. 888 ◽  
Author(s):  
Andrew Charles ◽  
Andrew Rider
Keyword(s):  
Fracture Toughness ◽  
Triblock Copolymer ◽  
Peel Strength ◽  
Positive Pressure ◽  
Resin System ◽  
Strength Performance ◽  
Performance Improvements ◽  
Bonded Repair ◽  
Epoxy Resin System ◽  
Bonded Composite

Epoxy resins are the most widely used systems for structural composite applications; however, they lack fracture toughness, impact strength and peel strength due to high cross-linking densities. Use of conventional toughening agents to combat this can lead to reductions in mechanical, thermal and processability properties desirable for bonded composite applications. In this work, an asymmetric triblock copolymer of poly(styrene)–b–poly(butadiene)–b–poly(methylmethacrylate) was used to modify an epoxy resin system, with the materials processed using both vacuum bag and positive pressure curing techniques. Interlaminar fracture toughness testing showed improvements in initiation fracture toughness of up to 88%, accompanied by a 6 °C increase in glass transition temperature and manageable reductions in gel-time. Shear testing resulted in a 121% increase in ultimate shear strain with only an 8% reduction in shear strength. Performance improvements were attributed to nano-structuring within the toughened resin system, giving rise to matrix cavitation and dissipation of crack front strain energy upon loading.

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