کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5201581 1502899 2015 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Ultraviolet degradation of poly(vinyl alcohol) used in restoration of historical and cultural properties
ترجمه فارسی عنوان
تخریب الیافی پلی (وینیل الکل) مورد استفاده در بازسازی خواص تاریخی و فرهنگی
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
چکیده انگلیسی

Six types of poly(vinyl alcohol) were degraded by ultraviolet irradiation with wavelengths of 185, 254, and 365 nm, respectively. The degradation fragments were characterized by attenuated total reflectance Fourier transform infrared (ATR-FT/IR), gel permeation chromatography (GPC), and nuclear magnetic resonance (NMR) including two-dimensional (2D) NMR measurements. Absorption peaks assigned to C-O at 1020, 1090, 1180, and 1250 cm−1 were observed in ATR-FT/IR spectra, and molecular weights decreased from 9 × 104 to about 7 × 104 in GPC measurements. In addition, spectra of proton and carbon NMR including 2D-NMR were clearly measured and analyzed after ultraviolet irradiation of PVA films from both front and back sides. Based on these results, the degradation mechanism is discussed and concluded.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer Degradation and Stability - Volume 114, April 2015, Pages 30-36
نویسندگان
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