Abstract
The characterization of surface viscoelasticity and energy dissipation in a polymer film by atomic force microscopy was investigated. The SEBS consisting of hard PS and soft PEB components was selected. The number-average molecular weight, Mn, is 74 000, and the molecular weight distribution, Mw/Mn, was about 1.1. The weight fraction of PS for this triblock copolymer was 42%. The as-prepared films were first dried in a fume hood for 3 days and then in vacuum at room temperature for another 7 days to remove residual solvent. The quality factor Q was calculated by dividing the resonant frequency by the width of the resonant peak at half the maximum power. The samples were scanned at constant force using a triangular Si3N4 cantilevers with nominal spring constant of 0.32 N/m. The regions exhibiting larger Edis could be identified as the soft PEB blocks, while the regions showing smaller Edis correspond to the hard PS blocks.
Original language | English |
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Pages (from-to) | 8693-8697 |
Number of pages | 5 |
Journal | Macromolecules |
Volume | 44 |
Issue number | 21 |
DOIs | |
Publication status | Published - 2011 Nov 8 |
ASJC Scopus subject areas
- Organic Chemistry
- Polymers and Plastics
- Inorganic Chemistry
- Materials Chemistry