Journal
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
Volume 65, Issue -, Pages 565-573Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmbbm.2016.09.011
Keywords
PAM/PVA blends; Molecular dynamics; CompatibilityMechanical properties; Molecular mechanism
Funding
- National Natural Science Foundation of China [51175432]
- Doctor Special Science and Technological Funding of the China Ministry of Education [20116102110046]
- Fundamental Research Funds for the Central Universities [3102014JCS05007]
- Key Industrial Science and Technology Projects of Shaanxi [2015GY047]
- Xinjiang Uygur Autonomous Region Science and Technology Project [201130112]
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The objectives of this study were to develop a computational model based on molecular dynamics technique to investigate the compatibility and mechanical,properties of Polyacrylamide (PAM)/Polyvinyl alcohol (PVA) blends. Five simulation models of PAM/PVA with different composition ratios (4/0, 3/1, 2/2, 1/3, 0/4) were constructed and simulated by using molecular dynamics (MD) simulation. The interaction mechanisms of molecular chains in PAM/PVA blend system were elaborated from the aspects of the compatibility, mechanical properties, binding energy and pair correlation function, respectively. The computed values of solubility parameters for PAM and PVA indicate PAM has a good miscibility with PVA. The results of the static mechanical analysis, based on the equilibrium structures of blends with differing component ratios, shows us that the elastic coefficient, engineering modulus, and ductility are increased with the addition of PVA content, which is 4/0 PAM/PVA <3/1 PAM/PVA < 2/2 PAM/PVA < 1/3 PAM/ PVA < 0/4 PAM/PVA. Moreover, binding energy results indicate that a stronger interaction exists among PVA molecular chains comparing with PAM molecular chains, which is why the mechanical properties of blend system increasing with the addition of PVA content. Finally, the results of pair correlation functions (PCFs) between polar functional groups and its surrounding hydrogen atoms, indicated they interact with each other mainly by hydrogen bonds, and the strength of three types of polar functional groups has the order of O(-OH) > O(-C= O) > N(-NH2). This further elaborates the root reason why the mechanical properties of blend system increase with the addition of PVA content. (C) 2016 Elsevier Ltd. All rights reserved.
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