tailieunhanh - Polymer Thin Films Part 6

Tham khảo tài liệu 'polymer thin films part 6', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 114 Polymer Thin Films Fig. 2. B. FTIR Spectra of Polyaniline Pristine and irradiated polyaniline at different fluences Assignment RF Polyaniline Pristine Irradiated 1 x 1011 ions cm2 1 x 1013 ions cm2 N-H Vibration 3207 3353 3340 C-H Stretch 2883 2834 3058 2875 3058 2873 C C - 2132 2183 Ring Stretch 1656 1423 1664 1436 1565 1548 1444 CH in plane deformation 1059 1037 C-N Stretch 971 973 975 1326 CH Out of plane deformation 783 804 825 Table. 1. FTIR assignments of Polyaniline Pristine and irradiated polyaniline at different fluences From the FTIR spectrum of polyaniline it is clear that the plasma-polymerised aniline is highly disordered. Based on the above discussion and from available literature it is inferred that the hydrogen abstraction is a possibility during plasma polymerisation. From FTIR analysis a plausible structure for plasma polymerised aniline is proposed and is shown in Figure 3 S. Saravanan et al. 2008 . Investigations on pristine and swift heavy ion irradiated plasma polymerized aniline thin films 115 Fig. 3. Tentative structure of RF plasma polymerised aniline From the FTIR spectrum peaks assigned to the irradiated polyaniline are tabulated in Table 1. FTIR spectrum of polyaniline irradiated with swift heavy ions also shows broad peaks. From the spectrum it can be seen that there is intense shift in NH stretching and CH stretching bands with respect to the polyaniline pristine. This indicates that the swift heavy ion irradiation disturbs the polymer chain. Also there is no intense shift in peaks corresponding to the aromatic ring which is indirect evidence to the fact that the swift heavy ion irradiation doesn t affect the aromatic ring. Apart from these fundamental spectral bands the bands at 2132 cm-1 and 2183 cm-1 are observed Robert M. Silverstein et al. 1980 for films bombarded with fluence of 1 X 1011 ions cm2 and 1 X 1013 ions cm2 respectively. This peak corresponds to the C C group. The intensity of the peak increases with increase of .