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Interfacial Adhesion of Polylactic Acid on Cellulose Surface: A Molecular Dynamics Study
Zechun Ren1, Rui Guo1, Hongjie Bi1
1Key Laboratory of Bio-Based Material Science and Technology (Ministry of Education) , Northeast Forestry University , Harbin 150040 , China.
ACS Applied Materials & Interfaces
|December 24, 2019
Summary
Molecular dynamics simulations reveal that hydrogen bonds enhance adhesion between polylactic acid (PLA) and cellulose. Surface roughness and molecular protrusions on cellulose planes strengthen this interfacial bonding in polymer composites.
Area of Science:
- Materials Science
- Polymer Science
- Surface Chemistry
Background:
- Interfacial bonding is critical for polymer composite properties.
- Understanding molecular interactions at interfaces informs material design.
Purpose of the Study:
- To investigate interfacial structure and adhesion mechanisms between crystalline cellulose and polylactic acid (PLA).
- To elucidate the role of molecular dynamics (MD) simulations in characterizing these interactions.
Main Methods:
- Utilized molecular dynamics (MD) simulations.
- Analyzed the interfacial structure and adhesion behavior of cellulose planes in contact with PLA.
- Examined the influence of functional group polarity and surface roughness.
Main Results:
- PLA structures at the interface adapt to the cellulose surface topography.
- Adhesion is influenced by functional group polarity and surface roughness.
- Hydrogen bonds between cellulose and PLA chains are the primary drivers of improved adhesion.
- Increased cellulose surface roughness and molecular protrusions enhance PLA adhesion via hydrogen bonding.
Conclusions:
- Molecular-level insights into PLA-cellulose interfacial mechanisms were provided.
- Surface characteristics of cellulose significantly impact adhesion to PLA.
- MD simulations are effective for studying polymer-composite interfaces.
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