نوع مقاله : مقاله پژوهشی
نویسندگان
1 گروه مهندسی بیوسیستم، دانشکده کشاورزی، دانشگاه فردوسی مشهد، مشهد، ایران
2 گروه صنایع غذایی، جهاد دانشگاهی، مشهد، ایران
چکیده
پلیلاکتیک اسید یک پلیمر گرمانرم، زیستتخریبپذیر و زیستفعال است که از منابع تجدیدپذیر مانند چغندر و سیبزمینی بهدست میآید. پلیلاکتیک اسید پلیمری با ماهیت نسبتاً شکننده است که این ویژگی میتواند کاربردهای آن را در صنعت بستهبندی محدود سازد. خواص مکانیکی این پلیمر میتواند با افزودن نانوذرات و نرمکنندهها بهبود یابد. در این تحقیق، نانوذرات اکسید روی به میزان یک درصد وزنی پلیمر، پلیاتیلن گلیکول 400 بیست درصد وزنی پلیمر و پلیسوربات 80، 0.25 درصد وزنی محلول برای بهبود خواص مکانیکی فیلمهای پلیلاکتیک اسید استفاده شدند. اثر این مواد بر فیلمها در دو بازه زمانی مختلف، ماه اول و ماه دهم، با هدف بررسی پیری فیزیکی بهعنوان مقدمه برای تخریب پلیمر، مورد ارزیابی قرار گرفت. تحلیلهای آماری بر روی خواص مکانیکی اندازهگیریشده در این دورهها انجام شد تا تفاوتهای معنادار میان فیلمهای تولیدشده شناسایی گردد. نتایج نشان داد که بالاترین استحکام کششی (1.90±82.99 مگاپاسکال، فیلم پلیلاکتیک اسید خالص)، ازدیاد طول در نقطه شکست (27.22±76.82 درصد، فیلم پلیلاکتیک اسید/پلیاتیلن گلیکول/نانوذرات اکسید روی)، چقرمگی (7.89±20.13 ژول بر سانتیمترمکعب، فیلم پلیلاکتیک اسید/پلیاتیلن گلیکول/نانوذرات اکسید روی)، مدول یانگ (0.10±2.74 گیگاپاسکال، فیلم پلیلاکتیک اسید خالص) در ماه اول مشاهده شد. نتایج تحلیل واریانس در مورد تأثیر زمان بر هر فیلم نشان داد که در اکثر موارد، خواص مکانیکی پس از ده ماه تغییر معناداری نداشتند. منحنیهای تنش-کرنش، نشان داد که فیلم پلیلاکتیک اسید خالص یک ماده مقاوم است. فیلم دارای نانوذرات و پلیسوربات در ماه دهم رفتار شکنندهای از خود نشان داد. سایر نمونهها در هر دو ماه اول و دهم رفتاری بین مواد مقاوم و انعطافپذیر نشان دادند.
کلیدواژهها
موضوعات
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