Rate-dependent self-healing behavior of an ethylene-co-methacrylic acid ionomer under high-energy impact conditions

2013 ◽  
Vol 130 (3) ◽  
pp. 1949-1958 ◽  
Author(s):  
Antonio Mattia Grande ◽  
Luca Castelnovo ◽  
Luca Di Landro ◽  
Cinzia Giacomuzzo ◽  
Alessandro Francesconi ◽  
...  
Keyword(s):  
Methacrylic Acid ◽  
High Energy ◽  
Self Healing ◽  
Energy Impact ◽  
Rate Dependent

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.

Mullite Diffusion Barriers for SiC-C/C Composites Produced by Pulsed Laser Deposition

1998 ◽  
Vol 555 ◽  
Author(s):  
H. Fritze ◽  
A. Schnittker ◽  
T. Witke ◽  
C. Rüscher ◽  
S. Weber ◽  
...  
Keyword(s):  
Pulsed Laser Deposition ◽  
Pulsed Laser ◽  
Target Material ◽  
High Energy ◽  
Single Step ◽  
Laser Deposition ◽  
Reduced Pressure ◽  
Oxidation Rates ◽  
Energy Impact ◽  
Diffusion Parameters

AbstractPulsed Laser Deposition (PLD) allows the ablation of nonconductive and high melting point target materials and the preparation of films with complex composition. High energy impact leads to melting and evaporation of the target material in a single step. In case of mullite ablation, the flux of the metal components is stoichiometric. Under reduced pressure the oxygen content in the layers decreases. However, after a short oxidation treatment, the formation of mullite in the coating is completed, as confirmed by IR spectroscopy and XRD investigations. For a commercial Si-SiC precoated C/C material, the effectiveness of additional PLD mullite layers as outer oxidation protection is tested in the temperature range 773 K < T < 1873 K. Mullite coatings with a thickness of 2.5 pm improve the oxidation behaviour significantly. Because of SiO2 formation at the mullite-SiC interface, all samples exhibited a mass increase upon oxidation. For oxidation durations of three days, only amorphous SiO2 is formed at the mullite-SiC interface. The inward diffusion of oxygen across the outer mullite-containing layer controls the kinetics of the reaction, as was deduced from 18O diffusivity measurements in PLD mullite layers. At temperatures close to the eutectic temperature (1860 K), mullite can seal defects. The calculated oxidation rates resulting from the diffusion parameters in SiO2 and mullite are close to the thermogravimetric data.

High energy impact techniques application for surface grain refinement in AZ91D magnesium alloy

2008 ◽  
Vol 43 (13) ◽  
pp. 4658-4665 ◽  
Author(s):  
Li-feng Hou ◽  
Ying-hui Wei ◽  
Bao-sheng Liu ◽  
Bing-she Xu
Keyword(s):  
Magnesium Alloy ◽  
Grain Refinement ◽  
High Energy ◽  
Az91d Magnesium Alloy ◽  
Energy Impact

Conductive, self-healing and recyclable electrodes for dielectric elastomer generator with high energy density

2022 ◽  
Vol 429 ◽  
pp. 132258
Author(s):  
Wenpeng Zang ◽  
Xueying Liu ◽  
Junjie Li ◽  
Yingjie Jiang ◽  
Bing Yu ◽  
...  
Keyword(s):  
Energy Density ◽  
High Energy ◽  
Dielectric Elastomer ◽  
High Energy Density ◽  
Self Healing

Self-healing chemistry enables the stable operation of silicon microparticle anodes for high-energy lithium-ion batteries

2013 ◽  
Vol 5 (12) ◽  
pp. 1042-1048 ◽  
Author(s):  
Chao Wang ◽  
Hui Wu ◽  
Zheng Chen ◽  
Matthew T. McDowell ◽  
Yi Cui ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Lithium Ion ◽  
High Energy ◽  
Stable Operation ◽  
Self Healing

Treatment of Peaty Clay by High Energy Impact

1979 ◽  
Vol 105 (8) ◽  
pp. 957-967
Author(s):  
Salem D. Ramaswamy ◽  
Seng-Lip Lee ◽  
M.H. Abdul Khader ◽  
Raja V. Subrahmanyam ◽  
Mohamed A. Aziz
Keyword(s):  
High Energy ◽  
Energy Impact
Sign in / Sign up

Export Citation Format

Share Document