پژوهش های کاربردی مهندسی شیمی - پلیمر
فصلنامه علمی - پژوهشی

بررسی اثر نشاسته گرمانرم بر میزان زیست تخریب پذیری خاکپوش های کشاورزی بر پایه پلی لاکتیک اسید و پلی اتیلن سبک

نوع مقاله : پژوهشی اصیل

نویسندگان

محمد شهابی قویونلوئی 1
مهدی خجسته پور 2
حسن صدرنیا 2
اسماعیل قاسمی 3

1 دانشجوی دکتری دانشگاه فردوسی مشهد

2 عضو هیئت علمی دانشگاه فردوسی مشهد

3 عضو هیئت علمی پژوهشگاه پلیمر و پتروشیمی ایران

چکیده
ضرورت افزایش محصولات کشاورزی به تناسب رشد جمعیت و مدیریت بحران کم‌آبی نیازمند ابتکاراتی است تا همزمان با حفظ محیط­زیست، بتواند با به­کارگیری روش‌های ذخیره رطوبت خاک بر کمیّت و کیفیت محصولات تولیدی بیفزاید. در این مطالعه، اثر درصدهای مختلف نشاستۀ گرمانرم به­همراه سازگارکننده مالئیک­انیدرید و همچنین نانوذره خاک رس (15A) بر مقادیر محتوای ژلی و خواص مکانیکی خاکپوش‌های کشاورزی بر پایۀ پلی­لاکتیک­اسید و مخلوط پلی­اتیلن سبک و پلی­اتیلن خطی سبک مورد بررسی قرار گرفت. بدین منظور از درصدهای 0، 10، 20 و 30 نشاستۀ گرمانرم در مخلوط 80/20 پلی­اتیلن سبک و پلی­اتیلن خطی سبک و همچنین پلی­لاکتیک­اسید استفاده شد. در طرح آزمایشی انجام شده پارامترهای مستقل، شامل درصد نشاستۀ گرمانرم، نوع پلیمر پایه و پیرشدگی و پارامترهای وابسته نیز میزان محتوای ژلی، استحکام کششی، درصد ازدیاد طول در هنگام شکست و مدول کشسانی در نظر گرفته شد. محتوای ژلی در آمیزه­های حاوی پلی­اتیلن با افزودن نشاستۀ گرمانرم، افزایش و همچنین در آمیزه­های حاوی پلی­لاکتیک­اسید به­تدریج کاهش یافت. بازه تغییرات محتوای ژلی برای نمونه­های آزمایشی قبل و بعد از آزمون پیرشدگی به­ترتیب: بین 10 الی 21 و 2 الی 5 درصد به‌دست آمد. استحکام کششی و ازدیاد طول تا شکست با افزودن نشاستۀ گرمانرم، برای هر دو مجموعه ترکیبات قبل از آزمون پیرشدگی کاهش یافت. اما این روند کاهنده در اختلاط 20 درصدی نشاستۀ گرمانرم، کمتر بود. مقادیر استحکام کششی و ازدیاد طول تا شکست به­ترتیب بین 12 الی 19 مگاپاسکال و 50 الی 350 درصد متغیر بود. این مقادیر برای نمونه­ها بعد از آزمون پیرشدگی به­ترتیب بین 7 الی 11 مگاپاسکال و صفر تا 5 درصد تغییر کرد.

کلیدواژه‌ها

پلی اتیلن سبک
پلی لاکتیک اسید
نشاستۀ گرمانرم
زیست تخریب پذیری

موضوعات

عنوان مقاله English

Investigation of the TPS Effect on the Biodegradability of Agricultural Mulches Based on PLA and LDPE

نویسندگان English

Mohammad Shahabi Ghoyonloe 1
Mehdi Khojastehpour 2
hassan sadrnia 2
Ismaeil Ghasemi 3
1 PhD student in Ferdowsi University of Mashhad
2 Faculty Member of Ferdowsi University of Mashhad
3 Faculty member of Iran Polymer and Petrochemical Institute
چکیده English

Abstract

Research subject: The need to increase agricultural production in proportion to population growth and water crisis management requires initiatives that can increase the quantity and quality of crops by using soil moisture storage methods while preserving the environment. In this study, the effect of different wt. % of Thermoplastic starch (TPS) with maleic anhydride (MA) as compatibilizer and nanoclay (15A) on gel content and mechanical properties of Polylactic acid (PLA) and blends of Linear low-density polyethylene/ Low-density polyethylene (LLDPE / LDPE) was evaluated.

Research approach: Here, 0, 10, 20 and 30 wt. % TPS were added to the blends of LLDPE/LDPE (20/80) and also PLA. Independent parameters in the experimental design were wt. % of TPS, basic polymer type that was PLA or TPS and aging test. For dependent parameters were considered gel content, tensile strength, elongation at break and elastic modulus. Experiments were designed in General Full Factorial Design and performed in three replications.

Main results: Gel content in LLDPE/LDPE blends increased with the addition of TPS and decreased for PLA blends. The gel content change range for experimental samples before and after the aging test was between 10 to 21 and 2 to 5 percent, respectively. Tensile strength and elongation at break were reduced by adding TPS in both series of compounds before aging test. But this reducing rate was less in the 20 wt. % of TPS. The values ​​of tensile strength and elongation at break were: 12 to 19 MPa and 50 to 350 percent, respectively. These values changed after the aging test between 7 and 11 MPa and from zero to 5 percent, respectively.

Keywords: biodegradability, low density polyethylene, poly lactic acid, thermoplastic starch.

کلیدواژه‌ها English

biodegradability
low density polyethylene
poly lactic acid
thermoplastic starch
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