تأثیر غلظت‌های مختلف گلیسرول بر ویژگی‌های فیلم ترکیبی بر پایه پلی وینیل الکل- صمغ قدومه شیرازی

مجله پژوهشهای علوم و صنایع غذایی ایران

مقاله 35، دوره 12، شماره 5 - شماره پیاپی 41، آذر و دی 1395، صفحه 663-677   

نوع مقاله: مقاله پژوهشی

شناسه دیجیتال (DOI): 10.22067/ifstrj.v12i5.53473

نویسندگان

لیلا منجذب مرودشتی؛ مسعود یاورمنش^* ؛ آرش کوچکی

دانشگاه فردوسی مشهد

چکیده

فیلم زیست‌تخریب‌پذیر ترکیبی با استفاده از پلی‌وینیل الکل- صمغ قدومه شیرازی با نسبت 60 به 40 با افزودن شش غلظت مختلف گلیسرول (%70-20) به روش قالب‌گیری ساخته شد. ویژگی‌های فیلم شامل ضخامت، دانسیته، میزان رطوبت، جذب رطوبت، حلالیت در آب، زاویه تماس قطره آب، رنگ، نرخ عبور بخار آب و خواص مکانیکی آن‌ها مورداندازه‌گیری قرار گرفت. درضمن از آزمون‌های طیف‌سنج مادون‌قرمز و میکروسکوپ الکترونی نیز برای بررسی برهم‌کنش‌های شیمیایی و ویژگی‌های ریزساختار فیلم‌ها استفاده شد. افزایش غلظت گلیسرول به‌طور معنی‌داری (05/0 >P) باعث افزایش ضخامت، میزان رطوبت، جذب رطوبت، حلالیت در آب، دانسیته، شفافیت، کاهش زاویه تماس، نفوذپذیری به بخار آب و کدورت گردید. افزایش غلظت گلیسرول بر پارامترهای رنگ نیز اثر گذاشت، به‌طوری‌که میزان روشنایی و زردی فیلم را به‌ترتیب از 90 به 4/94 و از 5/0 به 3/1 افزایش و میزان قرمزی را از 9/0 به 5/0 کاهش داد. به‌طورکلی فاکتورهای رنگی شامل اندیس سفیدی، اندیس زردی و میزان اشباعیت رنگ افزایش و اختلاف رنگ نمونه‎ها با پلیت سفید کاهش یافت. آزمون مکانیکی فیلم‌ها نشان داد که مقاومت کششی از 6/64 به 2/13 و مدول یانگ نیز از 892 به 85/156 مگاپاسکال کاهش و درصد کشیدگی از 1/2 به 47/15 درصد افزایش یافت. افزایش غلظت گلیسرول، نفوذپذیری به بخار آب را تا بیش از 7/4 برابر افزایش داد. با افزایش غلظت گلیسرول تغییر اندکی در ساختار فیلم‌ها مشاهده شد. فیلم‌ها با نسبت بالاتر گلیسرول تصاویر ریزساختار با سطوح یکنواخت و بدون منفذی را نشان دادند.

کلیدواژه‌ها

پلی وینیل الکل؛ صمغ قدومه شیرازی؛ گلیسرول؛ فیلم زیست‌تخریب‌پذیر

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