کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
11027053 1666328 2018 35 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Synthesis and application of a benzoxazine-type phosphorus-containing monomer on epoxy/benzoxazine copolymer: Thermal stability and compatibility with liquid oxygen
ترجمه فارسی عنوان
سنتز و کاربرد مونومر حاوی فسفر بنزوکساز نوعی در کوپلیمر اپوکسی / بنزوکسازین: پایداری حرارتی و سازگاری با اکسیژن مایع
کلمات کلیدی
اپوکسی، بنزوکسازین، فسفر، پایداری حرارتی، سازگاری با اکسیژن مایع
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
چکیده انگلیسی
Alkene-terminated monofunctional benzoxazine monomer (A-BA) was synthesized using allylamine, phenol and paraformaldehyde. Subsequently, the phosphorous-containing benzoxazine monomer (PBA) was obtained through the addition reaction between 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and A-BA in toluene. Finally, epoxy/benzoxazine copolymer with chemically-bonded DOPO was prepared using the synthesized PBA as hardener of DGEBA. DMA results showed that polymer with the chemically-bonded DOPO possessed higher modulus and crosslink density than that with physical-blended DOPO. Thermal gravimetric analysis (TGA) showed that the epoxy/benzoxazine copolymer possessed much better thermal stability around 500 °C and the DOPO-containing epoxy/benzoxazine copolymer showed promoted behavior compared to the neat one. The char residue of the epoxy/benzoxazine copolymer revealed dense surface layer and unbroken original dimension which was in accordance with the TGA results and the phosphorous-rich cover was observed. The liquid oxygen (LOX) compatibility of the copolymers was evaluated through mechanical impact in accordance with ASTM D2512-95 which showed that the LOX compatibility of the epoxy/benzoxazine copolymers were better than the epoxy/amine ones and the epoxy/benzoxazine copolymer including PBA exhibited promoted stability in the impact test. The surface elemental composition of the specimen before and after mechanical impact was investigated by X-ray photoelectron spectroscopy (XPS) and increased oxidation state of phosphorus was observed which explained the mechanism of phosphorus on promoting the LOX compatibility of the copolymer.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer Degradation and Stability - Volume 157, November 2018, Pages 131-142
نویسندگان
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