بررسی تاثیر نانورس (مونت موریلونیت) بر ویژگی های نفوذپذیری به بخار آب، زاویۀ تماس و خواص حرارتی فیلم نانوکامپوزیتی بر پایۀ کربوکسی متیل سلولز- پلی وینیل الکل

نوع مقاله : مقاله پژوهشی

نویسندگان

• لیلا ابوالقاسمی فخری ¹
• بابک قنبرزاده ¹
• جلال دهقان نیا ¹
• علی اکبر انتظامی ²

¹ دانشگاه تبریز

² استاد، گروه شیمی پلیمر، دانشکده شیمی، دانشگاه تبریز، ایران

https://doi.org/10.22067/ifstrj.v8i4.20159

چکیده

ویژگی آب دوستی بالا، یکی از مهمترین مشکلات پلاستیک های بسته بندی بر پایۀ بیوپلیمرهاست و ترکیب آن ها با پلیمرهای سنتزی سازگار با آن ها و استفاده از نانوذراتی مانند نانورس به عنوان پرکننده، روشهای بهبود دهنده ای هستند که در سال های اخیر مورد توجه گسترده ای قرار گرفته اند. یکی از ارزان ترین بیوپلیمرها که کاربرد گسترده ای در صنعت دارد، کربوکسی متیل سلولز (CMC) است و پلیمر سنتزی پلی وینیل الکل (PVA) به علت داشتن ماهیت قطبی، سازگاری خوبی با بیوپلیمرها نشان می دهد. در این پژوهش فیلم نانوکامپوزیت کربوکسی متیل سلولز (CMC)- پلی وینیل الکل (PVA) حاوی مقادیر 3 تا 10 درصد نانورس مونت موریلونیت (MMT) با استفاده از روش قالب گیری تولید شدند. بررسی ساختار فیلم های نانوکامپوزیت با استفاده از آزمون پراش اشعۀ X (XRD) حاکی از ساختار لایه لایه5 فیلم ها در تمام غلظت های نانورس بود. نانوکامپوزیت های حاوی 10% نانورس، 06/29 درصد کاهش در نفوذپذیری نسبت به بخار آب را نسبت به فیلم آلیاژی نشان دادند. کمترین ویژگی آب دوستی سطحی در فیلم های حاوی 10 درصد نانوذره با زاویۀ تماس اولیه برابر با 1/65 درجه مشاهده شد. نتایج کالریمتری روبشی افتراقی (DSC) نیز افزایش Tg6 فیلم حاوی 3 درصد نانورس را در مقایسه با فیلم فاقد MMT نشان داد و در مقادیر بیشتر نانوذره (5، 7 و 10 درصد) پدیده انتقال شیشه ای در فیلم ها مشاهده نشد.

کلیدواژه‌ها

• فیلم زیست تخریب پذیر
• کربوکسی متیل سلولز
• پلی وینیل الکل
• نانورس
• نانوکامپوزیت

عنوان مقاله [English]

Effect of Nanoclay (Montmorillonite) on Water Vapour Permeability, Contact Angle and Thermal Properties of Carboxymethyl Cellulose-polyvinyl Alcohol Based Nanocomposite Films

نویسندگان [English]

• Leila Abolghasemi Fakhri ¹
• Babak Ghanbarzadeh ¹
• Jalal Dehghan nia ¹
• Ali Akbar Entezami ²

¹ University of Tabriz

² Professor of Polymer Chemistry, Faculty of Chemistry, University of Tabriz, Iran

چکیده [English]

The high hydrophilic property of biopolymer based plastics is one of the most important defects of them. Blending biopolymers with compatible synthetic polymers and using nano particles such as nanoclay as nanofiller are improving methods that have been extensively considered in recent years. Carboxymethyl cellulose (CMC) is one of the lowest cost biopolymers that have enormous applications in different industries and polyvinyl alcohol (PVA) is a synthetic polymer which has a high compatibility with biopolymers. In this research, CMC-PVA nanocomposites containing 3-10% Montmorillonite (W/W CMC) were prepared by casting method. The X-ray diffraction (XRD) results indicated the formation of an exfoliated nanostructure in all MMT content samples. Nanocomposites containing 10% MMT exhibited 29.06% reduction in water vapor permeability (WVP) compared to the blend film without nanoclay. Samples with 10% MMT, showed the lowest surface hydrophilisity (contact angle = 65.1o). The differential scanning calorimetry (DSC) results indicate that by increasing of MMT contents, the glass transition disappeared gradually and no glass transition was observed in the thermograms of the films containing 5, 7 and 10% MMT.

کلیدواژه‌ها [English]

• Biodegradable film
• Carboxymethyl Cellulose
• Polyvinyl alcohol
• Nanoclay
• Nanocomposite

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