Surface engineering and hardening in 130 keV Ar+ ions implanted poly (bisphenol A carbonate)
摘要
130 keV Ar+ ions implantation induced effect on hardness of surface layers of poly (bisphenol A carbonate) has been investigated in detail. The formation of hardened surface has been observed using Knoop Hardness tester. Surface hardening by a factor of 3, 15 and 18 at dosage of 1 × 1014 Ar+ cm−2, 1 × 1015 Ar+ cm−2 and with the maximum dose 1 × 1016 Ar+ cm−2 has been observed after implantation respectively. The post implantation changes in surface structure of the poly (bisphenol A carbonate) were analyzed using the Raman spectroscopy and Fourier transform infrared (FTIR) technique in specular reflection mode. The surface imaging of pre and post implanted samples has been done using atomic force microscopy (AFM). The change in bonding and structure as observed using these techniques has been successfully correlated and further supported the hardened surface formation in the poly (bisphenol A carbonate) matrix. The increase in the surface roughness has been correlated with the disordered graphitic structure observed in Raman spectra of the implanted specimens. This polymer has an aromatic structure having linear polyester of carbonic acid. In this polymer the carbonate groups reappear in the backbone according to the general formula given by;