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تاثیر نانوذرات تیتانیوم دیاکسید و نقره بر ویژگیهای مکانیکی و ترموفیزیکی نانوکامپوزیت مورد استفاده در بستهبندی مواد غذایی | ||
پژوهش های صنایع غذایی | ||
مقاله 9، دوره 28، شماره 3، مهر 1397، صفحه 101-110 اصل مقاله (1 M) | ||
نویسندگان | ||
جابر سلیمانی1؛ بابک قنبرزاده* 2؛ جلال دهقاننیا2 | ||
1مرکز تحقیقات و آموزش کشاورزی استان آذربایجان شرقی | ||
2گروه علوم و صنایع غذایی دانشگاه تبریز | ||
چکیده | ||
نانوکامپوزیتهای بر پایهی پلیاستایرن با استفاده توام از نانوتیتانیوم دیاکسید و نانونقره (نسبت 7 به 3) به وسیلهی فرآیند اختلاط با ذوب در دمای °C190 و در دو سطح %5/0 و %1 تولید شدند. با استفاده ازمیکروسکوپ الکترونی روبشی(SEM) متصل شده با طیفنگاری پاشندگی انرژی اشعهی x (EDS)، حضور و مقادیر نانوذرات تیتانیوم و نقره تایید شد. تصاویر حاصل ازSEM نشان داد که نانوذرات به صورت مجزا و تجمع یافته وجود دارند و به تبع آن، EDS هم نشان داد که تنها سه عنصر کربن، تیتانیوم و نقره در ساختار نانوکامپوزیت وجود دارد، همچنین، نسبت نانوتیتانیوم به نانونقره حدود 10 برابر بود. نتایج حاصل از آزمون کشش نشان داد که افزودن نانوذرات منجر به کاهش جزئی مدول یانگ و تنش در نقطهی شکست نانوکامپوزیتها در مقایسه با پلیاستایرن خالص شد و از نقطه نظر کرنش در نقطهی شکست تفاوت معنیداری بین نانوکامپوزیتها و پلیاستایرن خالص مشاهده نشد (05/0˃P). تاثیر نانوذرات بر ویژگیهای حرارتی شبکهی پلیمری با استفاده از کالریمتری روبشی افتراقی و وزنسنجی حرارتی ارزیابی شد. ویژگیهای حرارتی نانوکامپوزیتها از نقطه نظر دمای انتقال شیشهای و پایداری حرارتی در مقایسه با پلیاستایرن خالص بهبود جزئی نشان داد. | ||
کلیدواژهها | ||
بستهبندی؛ پلیاستایرن؛ نانوکامپوزیت؛ مکانیکی؛ ترموفیزیکی | ||
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