Self-healing of delamination cracks in mendable epoxy matrix laminates using poly[ethylene-co-(methacrylic acid)] thermoplastic

2012 ◽  
Vol 43 (8) ◽  
pp. 1301-1307 ◽  
Author(s):  
K. Pingkarawat ◽  
C.H. Wang ◽  
R.J. Varley ◽  
A.P. Mouritz
Keyword(s):  
Methacrylic Acid ◽  
Epoxy Matrix ◽  
Self Healing ◽  
Poly Ethylene ◽  
Delamination Cracks

scholarly journals Exploring the Possibility of Using Ionic Copolymer Poly (Ethylene-co-Methacrylic) Acid as Modifier and Self-Healing Agent in Asphalt Binder and Mixture

2020 ◽  
Vol 10 (2) ◽  
pp. 426
Author(s):  
Yuefeng Zhu ◽  
Reyhaneh Rahbar-Rastegar ◽  
Yanwei Li ◽  
Yaning Qiao ◽  
Chundi Si
Keyword(s):  
Methacrylic Acid ◽  
Asphalt Binder ◽  
Asphalt Mixtures ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Self Healing ◽  
Cracking Resistance ◽  
Poly Ethylene ◽  
Copolymer Poly ◽  
Ionic Copolymer

It is well-accepted that the ionic copolymer poly (ethylene-co-methacrylic) acid (also named EMAA) is one type of self-healing material. This particular capability has great potential for extending the service life of infrastructures. In order to improve the rheological, mechanical, and self-healing properties of asphalt binder and asphalt mixtures, EMAA and styrene butadiene rubber (SBR) were selected as the additives. In this study, the effects of EMAA and SBR on the performance of bitumen and asphalt mixtures were examined and characterized using various parameters including rheological indices, Glover–Rowe parameter, ductility self-healing rate, fluorescence microscopy, and scanning electron microscope (SEM) test on binders, and different testing methods such as complex modulus, thermal stress-restrained specimen test (TSRST), disk-shaped compact tension (DCT), and fatigue–healing–fatigue test on the mixtures. The results showed that EMAA can significantly improve the stiffness and self-healing capacity of virgin and SBR modified binders and mixtures. Moreover, the cracking resistance of EMAA/SBR compound modified binder and mixture showed a significant improvement. However, EMAA is not recommended to be added as a modifier to virgin binders and mixtures due to its poor cracking resistance. Some novel tests and parameters mentioned in this paper are recommended for characterizing binders and mixtures in the future.

scholarly journals Thermal characteristics of the self-healing response in poly(ethylene- co -methacrylic acid) copolymers

2006 ◽  
Vol 4 (13) ◽  
pp. 405-411 ◽  
Author(s):  
Stephen J Kalista ◽  
Thomas C Ward
Keyword(s):  
Methacrylic Acid ◽  
Mechanistic Model ◽  
Healing Process ◽  
Thermal Characteristics ◽  
High Energy ◽  
General Mechanism ◽  
Self Healing ◽  
Thermal Dependence ◽  
Healing Response ◽  
Poly Ethylene

A class of poly(ethylene- co -methacrylic acid) (EMAA) copolymers and ionomers has shown the unique ability to instantaneously self-heal following ballistic puncture. It is noteworthy that the thermomechanical healing process active in these materials appears to be significantly different in capability and mechanism than any of the other self-repairing systems studied. To better understand this phenomenon, the thermal response during EMAA self-healing was examined. Tests of various damage types, including sawing, cutting and puncture, revealed high-energy transfer damage modes to produce heat and store energy favourable to healing. DSC probed healed specimens revealing they had reached the viscoelastic melt believed requisite to healing response. Low-temperature ballistic experiments demonstrated films continue healing even when punctured at −30°C; analysis showed healing efficacy comparable to room temperature, holding significant pressures of approximately 3 MPa. At the lowest temperature, brittle fracture occurred in one material indicating insufficient heat transfer to store recoverable energy. In total, the results supported the defined healing model and provided additional information on the healing process in both its thermal dependence and general mechanism. Finally, a new DSC method was developed for probing the thermal history of healed films which may lead to a more complete mechanistic model.

Addition of poly (ethylene-co-methacrylic acid) (EMAA) as self-healing agent to carbon-epoxy composites

2020 ◽  
Vol 137 ◽  
pp. 106016 ◽  
Author(s):  
Allana Azevedo do Nascimento ◽  
Fernando Fernandez ◽  
Fábio S. da Silva ◽  
Evans P.C. Ferreira ◽  
José Daniel D. Melo ◽  
...  
Keyword(s):  
Methacrylic Acid ◽  
Epoxy Composites ◽  
Self Healing ◽  
Healing Agent ◽  
Poly Ethylene
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