کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10397989 | 889844 | 2013 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Synthesis of functionalized polyolefins with novel applications as protective coatings for stone Cultural Heritage
ترجمه فارسی عنوان
سنتز پلی اکسید کارکرد پذیر با کاربرد های جدید به عنوان پوشش های محافظتی برای میراث فرهنگی سنگ
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
تکنولوژی و شیمی فرآیندی
چکیده انگلیسی
Ethylene copolymers were synthetized for application as protective coatings for stone surface monuments. An increased compatibility of the apolar polyethylene with inorganic materials was obtained by introducing some oxydril and ester groups in the polymers. Two different copolymerizations of ethylene were followed: with 10-undecen-1-ol (UDO) and 7-methyl-1,6-octadiene (MOD) catalyzed by Ziegler-Natta metallocene/methylaluminoxane (MAO) catalyst. In the first case the polar comonomer UDO was reacted with MAO prior to copolymerization to improve its compatibility with the catalyst. Residual double bonds in the copolymerization with MOD were hydroesterificated/hydrogenated. Some synthesis were performed in the presence of hydrogen as chain transfer agent to reduce molecular weights and increase solubility of the products. The polyolefins were characterized by analytical and spectroscopic techniques and their photochemical stability in environmental conditions was tested through an accelerated ageing chamber. Polyolefins were applied on stone specimens showing a slight chromatic change of the surfaces, not perceptible by naked eye. The protection performances were also evaluated in terms of water repellency, photo-oxidative stability and colour change of the treated stone surfaces in comparison with Paraloid B-72, an acrylic resin widely applied in the field of conservation. Ethylene/10-undecen-1-ol copolymer kept its protective efficiency after the ageing cycles thanks to its good stability to photo-oxidative degradation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Progress in Organic Coatings - Volume 76, Issue 11, November 2013, Pages 1600-1607
Journal: Progress in Organic Coatings - Volume 76, Issue 11, November 2013, Pages 1600-1607
نویسندگان
Andrea Pedna, Giulia Giuntoli, Marco Frediani, Piero Frediani, Luca Rosi,