| AVS 59th Annual International Symposium and Exhibition | |
| Surface Science | Tuesday Sessions |
| Session SS-TuP |
| Session: | Surface Science Poster Session |
| Presenter: | H.X. Ju, University of Science and Technology of China |
| Authors: | H.X. Ju, University of Science and Technology of China J.F. Zhu, University of Science and Technology of China |
| Correspondent: | Click to Email |
PMMA is an important thermoplastic material which has been utilized in a variety of engineering areas ranging from aeronautical applications to electronics industries, due to its attractive physical and optical properties. The physical and chemical interactions have been observed at the interfaces between metals and PMMA, which can play a crucial role in the device performance. As a result, significant attention has been paid to the interfaces in order to promote devices performance and stability.
In this work, we investigate in detail the chemical reaction during deposition of Ca on the PMMA surface by applying X-ray photoemission spectroscopy (XPS) and near-edge X-ray absorption fine structure spectroscopy (NEXAFS), which provide detailed information concerning surface chemical reaction. The changes of the O 1s and C 1s core level XPS spectra indicate a strong interaction between the Ca and the PMMA. The O K-edge NEXAFS spectra give a comprehensive insight into reaction sites. In this way, the pronounced decrease of the π* (C=O) resonance intensities with deposition of Ca clearly demonstrates that Ca atoms attack carbonyl groups in PMMA. The experimental results confirm the previous work regarding the adsorption microcalorimetry measurements of metal particles adsorption on polymer surfaces, which provide a powerful approach for determining the adsorption energy and understanding interfacial interactions. There is a high heat of Ca adsorption on PMMA surfaces of 780 kJ/mol, attributed to the reaction of each Ca reacts with 2 esters to form the Ca carboxylate. Furthermore, we provide addition information regarding the details of specific chemical interactions at the interface. These will greatly contribute toward further understanding of the interfaces between metals and polymers.