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MU DAN, LI JIANQUAN, WANG SONG, WANG JIANFENG. MOLECULAR DYNAMICS SIMULATION OF THE ADSORPTION AND DIFFUSION OF A SINGLE POLYDIMETHYLSILOXANE POLYMER CHAIN ON A SILICON (111) SURFACE. JOURNAL OF THEORETICAL & COMPUTATIONAL CHEMISTRY 2012. [DOI: 10.1142/s0219633612500460] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The adsorption of polydimethylsiloxane (PDMS) single chain with different chain lengths on a silicon (111) surface were studied by molecular dynamics simulations. The relative dielectric constant was selected to be 1 and 78.0 to mimic in vacuum and in solution environment, respectively. The chains were all present as two-dimensional (2D) adsorption conformation on the surface but different conformations and dynamic properties were found in the two absolutely different environments. The relationship between the adsorption energy of the different chain lengths and the degree of polymerization follows a linear function and the average adsorption energy per segment is -0.42 kcal/mol. In addition, the diffusion coefficient (D) of such chains scales with the degree of polymerization (N) as N-3/2.
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Affiliation(s)
- DAN MU
- College of Chemistry Chemical Engineering and Material Science, Zaozhuang University, Shandong 277160, P. R. China
| | - JIAN-QUAN LI
- Opto-Electronic Engineering College, Zaozhuang University, Shandong 277160, P. R. China
| | - SONG WANG
- Institute of Theoretical Chemistry, State Key Laboratory of Theoretical and Computational Chemistry, Jilin University, Changchun 130023, P. R. China
| | - JIAN-FENG WANG
- Department of Radiotherapy, China-Japan Union Hospital, Jilin University, Changchun 130033, P. R. China
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