Prediction of Normal Stress Difference and Relaxation Modulus of Polylactic Acid/Calcium Phosphate Nanocomposites
| Authors | G. Sahu1, M.S. Rajput2, A. Tripathi1, S.P. Mahapatra3 |
| Affiliations |
1Department of Mechanical Engineering, Government Engineering College, Raipur, 492015, Chhattisgarh, India 2Department of Mechanical Engineering, National Institute of Technology, Raipur, 492010, Chhattisgarh, India 3Department of Chemistry, National Institute of Technology, Raipur, 492010, Chhattisgarh, India |
| Е-mail | |
| Issue | Volume 16, Year 2024, Number 6 |
| Dates | Received 23 August 2024; revised manuscript received 14 December 2024; published online 23 December 2024 |
| Citation | G. Sahu, M.S. Rajput, A. Tripathi, S.P. Mahapatra, J. Nano- Electron. Phys. 16 No 6, 06001 (2024) |
| DOI | https://doi.org/10.21272/jnep.16(6).06001 |
| PACS Number(s) | 07.10.Lw, 62.40. + i, 77.84.Lf |
| Keywords | Polylactic acid (2) , Calcium phosphate, Normal stress difference, Viscoelastic properties, Relaxation modulus. |
| Annotation |
New research is being conducted to better understand the relationship between mechanical characteristics and strain rate in polymeric materials. In this study, calcium phosphate nanoparticles were incorporated into polylactic acid using ultrasonic vibration-assisted melt mixing, and the samples were cast under vacuum. The normal stress difference and relaxation modulus for the Polylactic acid/Calcium phosphate nanocomposites were calculated using the experimentally measured value of viscoelastic properties. The dependency of normal stress difference and relaxation modulus on different parameters was also shown for the validation of the expressions. The first normal stress difference and relaxation modulus were predicted based on the frequency dependence viscoelastic characteristics of polylactic acid/calcium phosphate nanocomposites. The first normal stress difference increases with shear rate and reaches a plateau at lower shear rates. The value of the first normal stress differential increases with calcium phosphate nanoparticle concentration, demonstrating that calcium phosphate promotes elasticity. The relaxation modulus falls as shear rates increase while increasing with calcium phosphate nanoparticle concentration. However, the incorporation of the calcium phosphate nanoparticle to polylactic acid increases the relaxation modulus because of polymer-filler interaction. |
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List of References |
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