bond energy
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2021 ◽  
Vol 2101 (1) ◽  
pp. 012061
Author(s):  
Jian Zhang ◽  
Junxue Zhai ◽  
Xijuan Zhao ◽  
Jinjian Lin ◽  
Qingguo Wang ◽  
...  

Abstract The influence of ambient temperature on the tensile stress-strain curve of polyaspartic ester polyurea (PAE-PU) was investigated to discuss the yield and breakage mechanism of tensile deformation. Temperature has a significant effect on the tensile stress-strain curve of PAE-PU. At low temperature (27, 40 °C), it shows obvious yield and forced high elasticity. After the temperature exceeds 80 °C, the yield phenomenon disappears and shows high elasticity of rubber: the strain energy and breakage energy are significantly reduced. The yield activation energy of PAE-PU was calculated by yield strain time at different temperatures. It was found that the yield activation energy decreased with the increase of tensile rate. When the tensile rate is 500mm/min, among the activation energies calculated by breakage strength, yield strength and Young’s modulus at different temperatures, the ordinary elastic deformation activation energy is higher, while the yield and breakage activation energy are close and lower. The latter two are close to the hydrogen bond energy and one order of magnitude lower than the chemical bond energy of molecular chain.


Author(s):  
Anton Lachowicz ◽  
Evan H. Perez ◽  
Nicholas S. Shuman ◽  
Shaun Ard ◽  
Albert A. Viggiano ◽  
...  
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2021 ◽  
Author(s):  
Anupreethi Balajiranganathan ◽  
Anurag Gupta ◽  
Umasankari Kannan ◽  
Akhilanand Pati Tiwari
Keyword(s):  

2021 ◽  
Vol 8 (2) ◽  
pp. 75-80
Author(s):  
Yang Luo ◽  
Guocui Teng

To figure out the effect of rubber modifiers on the self-healing performance of asphalt, this study took Eucommia rubber (TPI, trans-polyisoprene) and natural rubber (NR) as asphalt modifiers and employed the molecule simulation software to analyze the self-healing performance of asphalt in the microscale. At first, a model of basic asphalt system was established in the molecule simulation software, and three parameters of density, solubility and mean square displacement (MSD) were used to verify that the established model can act as the representative of asphalt molecules; then, several self-healing models of basic asphalt and rubber-modified asphalt were constructed to compare the properties of TPI and NR. In the experiment, the temperature was set to 303.15K, 313.15K, 323.15K, 333.15K, and 343.15K, respectively, and a 10Å (1Å=0.1nm) vacuum layer was taken as the microcrack of the asphalt, then the entire self-healing process of the models was analyzed, and the diffusion coefficient and energy change of the models were calculated. The experimental results revealed that, the NR-modified asphalt outperformed TPI in self-healing performance; for the NR-modified asphalt, as the temperature rises, the intermolecular non-bond energy changes, the molecule diffusion ability enhances, which can accelerate the self-healing progress of the microcracks in the asphalt.


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