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 Sự thay đổi các tính chất của nhựa epoxy-amine trong quá trình lão hóa tự nhiên
Tác giả hoặc Nhóm tác giả: Nguyễn Thanh Hội, BELEC Lénaïk, CHAILAN Jean-François, Nguyễn Đình Lâm
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Nơi đăng: Tạp chí Hóa học; Số: T. 53, số 4E1;Từ->đến trang: 9 - 13;Năm: 2015
Lĩnh vực: Khoa học công nghệ; Loại: Bài báo khoa học; Thể loại: Trong nước
TÓM TẮT
This study was carried out on samples of epoxy-amine resins with the crosslinking degree modified according to the thickness and being subject to the natural aging over a period of 2, 4 and 8 months in climatic conditions in Da Nang city - Vietnam. A variety of techniques has been used to identify the alteration of theirs properties during the aging process, such as scanning electron microscopy (SEM), three-point bending test, Fourrier transform infrared spectroscopy (FTIR), differential scanning calorimeter (DSC), dynamic-mechanical thermal analysis (DTMA). The obtained results showed that surfaces exposed to mold in the synthesis and not in direct contact with the air, are principally affected by ultraviolet (UV) radiation, whereas sample surfaces in contact with air during the synthesis occurred the secondary crosslinking due the excess oxiran cycles following the radical mechanism under effects of UV rays or of other ions in surface water condensate. On the other hand, the presence of water will increase the rate of decomposition of resins by leaching.
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ABSTRACT
This study was carried out on samples of epoxy-amine resins with the crosslinking degree modified according to the thickness and being subject to the natural aging over a period of 2, 4 and 8 months in climatic conditions in Da Nang city - Vietnam. A variety of techniques has been used to identify the alteration of theirs properties during the aging process, such as scanning electron microscopy (SEM), three-point bending test, Fourrier transform infrared spectroscopy (FTIR), differential scanning calorimeter (DSC), dynamic-mechanical thermal analysis (DTMA). The obtained results showed that surfaces exposed to mold in the synthesis and not in direct contact with the air, are principally affected by ultraviolet (UV) radiation, whereas sample surfaces in contact with air during the synthesis occurred the secondary crosslinking due the excess oxiran cycles following the radical mechanism under effects of UV rays or of other ions in surface water condensate. On the other hand, the presence of water will increase the rate of decomposition of resins by leaching.
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