کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5201605 1502900 2015 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The thermo-oxidative degradation of poly(4-methylstyrene) and its relationship to flammability
ترجمه فارسی عنوان
تخریب اکسید کننده ترموپلی (4-متیل استیرن) و ارتباط آن با اشتعال پذیری
کلمات کلیدی
ترک اکسیداسیون، ترموگرافی سنجی، جریان بخار پیلوریس-کالریمتری، پیوند متقابل،
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
چکیده انگلیسی
Polystyrene and poly(4-methylstyrene) have very similar chemical structures with the only differences being the para methyl group of poly(4-methylstyrene). This methyl group is susceptible to oxidation at elevated temperatures. Here we demonstrate that it is possible to introduce oxidative cross-links to poly(4-methylstyrene), via the para methyl group, by thermal oxidative treatment at 230 °C, 250 °C and 270 °C in the absence of catalyst, leading to a material with markedly modified thermal degradation chemistry. Thermal gravimetric analysis and differential scanning calorimetry were used to characterise and compare untreated and post-oxidised materials and established that as the temperature of pre-treatment was increased, the subsequent thermal stability of the material increased. FTIR, NMR and microanalysis indicated that after the thermal oxidative pre-treatment ether cross-links are present alongside new oxygen containing functional groups such as aldehydes, carboxylic acids and hydroxyl groups. Finally, data obtained from pyrolysis combustion flow calorimetry confirmed that as the number of oxidative cross-links increase, a reduction in the polymer's flammability as assessed by heat release data is observed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer Degradation and Stability - Volume 113, March 2015, Pages 144-153
نویسندگان
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