Abstract
Thin films of pure polycarbonate (PC) with anthracene doping PC films for different doping ratios (10, 20, 30, 40, 50 and 60 ml) were prepared by using a casting method. The influence of anthracene doping ratio on photo-fries rearrangement of polycarbonate was systematic investigated. Furthermore, pure PC and anthracene doping PC films were irradiated via UV light at a wavelength (254 nm) for different periods (5, 240, 288, and 360 hrs). The photo-fries rearrangement occurring in pure PC and anthracene doping PC films were monitored using UV and FTIR spectroscopies. The photo-fries rearrangement leads to scission the carbonate linkage and formation phenylsalicylate and dihydroxybenzophenes. The result of the UV spectrum confirms disappear of polycarbonate peaks, while phenylsalicylate and dihydroxybenzophenone peaks appear at (320 nm) and (360 nm), respectively. The formation of a dihydroxybiphenyl compound reveals when the UV peak distinguishes at (340 nm). FTIR spectroscopy supported forms of phenylsalicylate and dihydroxybenzophenone compounds which appear in carbonyl region at (1689 cm-1) and (1630 cm-1), respectively. It founds that anthracene accelerates the photo-fries rearrangement of polycarbonate in the anthracene doping PC films because anthracene leads to formation of excited singlet state oxygen (1O2). Singlet oxygen (1O2) leads to the formation of a hydro peroxide, which could decompose and cause to chain scission and formation of a terminal of a carbonyl group. The presence of the carbonyl groups in the polymer makes it photo-labile, also warns that the polymer is vulnerable to deterioration.
Highlights
Polycarbonate is a kind of polyester where the carbonate ester groups have been connected with an aromatic group [1,2,3,4]
The asprepared pure PC film and anthracene doping PC film were irradiated by UV light at wavelength 254 nm for various periods 5, 240, 288, and 360 hrs
Results show that the spectrum of pure PC film exhibit two major peaks at 305 nm and 345 nm, it’s referring to the carbonyl group of polycarbonate
Summary
Polycarbonate is a kind of polyester where the carbonate ester groups have been connected with an aromatic group [1,2,3,4]. The basic chemical structure of polycarbonate is shown, and the name of polycarbonate came from its carbonate backbone [5, 6]. When polycarbonate irradiation with UV lights at short wavelength (254 nm) the photo-fries rearrangement is taken place [7]. The. UV irradiation leads to scission the carbonate linkage and the formation of two free radicals. UV irradiation leads to scission the carbonate linkage and the formation of two free radicals These free radicals are rearranged in order to form phenylsalicylate and dihydroxybenzophenone, as well as another group such as dihydroxybiphenyl compounds.
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