Lexan POLYCARBONATE films were irradiated by UV radiation at wavelength l= 250 nm under different time exposures of 1, 2, 4, 6 and 7 h. Structural, optical and mechanical modifications were studied by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), differential scanning calorimetry (DSC), UV–Visible spectroscopy, impedance analysis, tensile testing and rheometry methods. The crystallite size and percentage of crystallinity were found to decrease upon irradiation as was studied by XRD. It indicated that polymer was moving towards more disordered state after irradiation corroborating DSC results. FTIR Study showed the carbonate linkage is the radiation-sensitive linkage and benzene ring does not undergo any change after irradiation. SEM results showed the formation of pores after irradiation. The atomic force microscopy measurements revealed that the average roughness of the film increased after being irradiated. The glass transition temperature was observed to decrease after irradiation as revealed by DSC measurement. UV–Visible spectra showed decrease in optical band gap after irradiation due to chain scission in the Lexan POLYCARBONATE. Plot of AC conductivity versus log (f) displayed a sharp increase in conductivity at higher frequencies and dielectric constant/loss was observed to change with the irradiation time. The mechanical properties and average molecular weight of Lexan POLYCARBONATE decreased after irradiation, while the average number of chain scissions per original polymer molecule increased with increase in time of exposure.

In this work,copper/palladium (Cu/Pd) multilayer nanowires were successfully prepared by electrode position method using POLYCARBONATE template. The fabrication of Pd/Cu multilayer nanowires was controlled by analyzing the current–time transient during electrode position using potentiostat. The morphological properties of the nanowires were studied by scanning electron microscopy (SEM) and result showed that almost each nanowire had the same length of » 4 mm and the diameter of 90 nm .X-ray diffraction pattern showed that Pd and Cu grow in their face-centered-cubic (fcc) lattice structures. The chemical composition was determined by examination of the energy dispersive X-ray (EDX) spectra.

Purpose: To compare the complications of pegging between the POLYCARBONATE peg system and the titanium peg system.Method: Complications associated with pegging (POLYCARBONATE: Bio-Eye or titanium: Dr-Perry new P-K) were reviewed from the hospital records of 153 patients over 5 years.Results: Out of 153 cases, 96 (62.3%) were male and 57 (37.7%) were female. Mean age was 27.7 yr (6-59 yr). In 88 cases, the peg was poly carbonate with sleeve system and in 65 cases, a titannium peg was used. There was at least one complication in 41 (46.6%) cases with POLYCARBONATE and 18 (27.7%) cases with titanium (P= 0.018). The rates of the most common complications including granulation tissue, discharge, conjunctival over growth, and peg falling out were 35%, 23%, 13%, and 8%, respectively in the POLYCARBONATE peg group and 15%, 5%, 1.5%, and 0 in the titanium peg group. The rate of the last 3 complications in the titanium peg group was statistically lower than the POLYCARBONATE group. Twenty-five (28.4%) cases with POLYCARBONATE peg and 5 (7.5%) cases with titanium peg had two or more complications (P= 0.03). Peg removal for treatment of complications was required in 11 out of 41 complicated cases (28.8%) of the POLYCARBONATE group but in 2 out of 18 complicated cases (11.1%) of the titanium group (P= 0.03).Conclusion: Both pegging systems incurred complications which were less severe and less prevalent with the titanium peg system. Surgical intervention for treatment of complications in the titanium peg system was required less than the poly carbonate peg. It may be concluded that the titanium peg is a good substitute to the POLYCARBONATE peg system.

In this research, thermal processes for removing the residual stresses from POLYCARBONATE sheet are evaluated using extensive experiments. In each step, by making suitable alterations and modifications on the heating cycle parameters, annealing operations are performed on the samples during a try and error process. Finally, appraising the obtained results, a modified thermal cycle is presented which can remove the residual stress from the POLYCARBONATE sample, while reducing the time and cost of the annealing process. According to this process, the specimen temperature is raised to 100oC at the heating rate of 20oC/h. The samples are kept at this temperature for 3 hours to become dried and then, the heating is continued up to glass transition temperature at the rate of 5oC/h. Then, the specimens are heated at the rate of 1oC/h until temperature of Tmax= 156oC. After reaching this temperature, the samples are cooled immediately, and the cooling rates are same as the heating rates.