Effects of aging and washing on UV and ozone-treated poly(ethylene terephthalate) and polypropylene

Effect of Ultraviolet Light Irradiation on Bonding of Experimental Composite Resin Artificial Teeth

“…These findings implied the likely changes in the UV-irradiated surface structure of the adherend, although no apparent changes could be detected in the FTIR spectra nor significant changes in the contact angle measurements. At this juncture, it must be mentioned that the typical probing depth of FTIR ranges from a few hundred nanometers to several micrometers -which is too deep for detecting chemical changes in the near-surface region 15,18) . A sensitive device that analyzes the shallower region of a surface, such as XPS 16,18,19) or an atomic force microscope 20) , would better detect the changes at the UV-irradiated surface.…”

“…At this juncture, it must be mentioned that the typical probing depth of FTIR ranges from a few hundred nanometers to several micrometers -which is too deep for detecting chemical changes in the near-surface region 15,18) . A sensitive device that analyzes the shallower region of a surface, such as XPS 16,18,19) or an atomic force microscope 20) , would better detect the changes at the UV-irradiated surface. UV irradiation, especially with ozone, has been reported to decrease the contact angle of distilled water on the irradiated surface 15,16,18,19) .…”

“…They can cause molecular bonds to be broken when absorbed in a molecule, a process referred to as photolytic chain scission 14) . The use of ultraviolet (UV) irradiation on the surface of polymers such as poly(dimethyl siloxane) [15][16][17] , polypropylene [18][19][20] , and poly(ethylene terephthalate) 18,21) have been studied in lithography and microelectronics. In terms of advantages, UV irradiation can improve the adhesive property of coatings as well as wettability and printability of polymers by changing the morphology and chemical properties of the polymer surface.…”

“…By means of Fourier transform infrared spectroscopy (FTIR), photolytic chain scission, formation of different functional groups, and degradation of polymer backbone have been observed 15,19) . By means of X-ray photoelectron spectroscopy (XPS), changes in chemical bonding energy have been detected 16,18,19,21) . Then, by means of contact angle measurement, changes in surface hydrophobicity have been monitored 15,16,18,19) .…”

“…By means of X-ray photoelectron spectroscopy (XPS), changes in chemical bonding energy have been detected 16,18,19,21) . Then, by means of contact angle measurement, changes in surface hydrophobicity have been monitored 15,16,18,19) . In a dental office, a UV sterilizer is an effective but inexpensive and speedy means of disinfection [23][24][25] .…”