خواص بازدارندگی نانوکامپوزیت‏ های نانوکریستال سلولز ـ پلی ‏وینیل ‏الکل

نوع مقاله: مقاله پژوهشی

نویسندگان

1 استادیار علوم و صنایع چوب و کاغذ، گروه سلولزی و بسته‌بندی، پژوهشکدۀ شیمی و پتروشیمی، پژوهشگاه استاندارد، کرج، ایران

2 دانشجوی دکتری علوم و صنایع چوب و کاغذ، پردیس کشاورزی و منابع طبیعی، دانشگاه تهران، کرج، ایران

3 کارشناس ارشد علوم و صنایع چوب و کاغذ، گروه سلولزی و بسته‌بندی، پژوهشکدۀ شیمی و پتروشیمی، پژوهشگاه استاندارد، کرج، ایران

چکیده

در این پژوهش خواص بازدارندگی نانوکامپوزیت‏ های حاصل از نانوکریستال سلولز ـ پلی وینیل الکل بررسی شد. فیلم‏های نانوکامپوزیت‏ حاوی درصد‏های متفاوت نانوکریستال سلولز (3، 6، 9 و 12 درصد وزنی) با روش قالب‏ریزی حلال تهیه شد. تأثیر نانوکریستال سلولز بر خواص بازدارندگی نانوکامپوزیت ‏ها مطالعه شد. بدین‌منظور، جذب رطوبت، نفوذپذیری به بخار آب، سرعت انتقال اکسیژن، و سرعت انتقال بخار مواد شیمیایی فیلم‏های نانوکامپوزیت اندازه‏گیری شد. نتایج نشان داد که افزودن نانوکریستال سلولز با کاهش جذب رطوبت، نفوذپذیری به بخار آب، سرعت انتقال اکسیژن، و سرعت انتقال بخار مواد شیمیایی موجب بهبود خواص بازدارندگی نانوکامپوزیت‏ ها می‌شود. بهبود خواص بازدارندگی نانوکامپوزیت‏ ها به درجۀ تبلور بالای نانوکریستال سلولز و واکنش شدید بین گروه‏های هیدروکسیلی نانوکریستال سلولز و زنجیرۀ پلیمری پلی وینیل الکل نسبت داده شد که نشان‌دهندۀ پخش خوب و چسبندگی مطلوب نانوکریستال سلولز و ماتریس پلی وینیل الکل است. علاوه بر این، نانوکریستال سلولز مسیر پر پیچ و خمی برای عبور مولکول‏های نفوذکننده فراهم می‏کند. میزان بهبود خواص بازدارندگی در ماتریس‏های با درجۀ هیدرولیز بالا در مقایسه با ماتریس‏های با درجۀ هیدرولیز پایین، چشمگیرتر بود.

کلیدواژه‌ها


عنوان مقاله [English]

Barrier Properties of Cellulose Nanocrystals -PVA Nanocomposites

نویسندگان [English]

  • Mehdi Roohani 1
  • Behzad Kord 1
  • Nazanin Motie 2
  • Farahnaz Behzadi 3
1 Assistant Professor, Department of Paper and Packaging, Faculty of Chemistry and Petrochemical Engineering, Standard Research Institute (SRI), Karaj, I.R. Iran
2 Ph.D. Student, Department of Wood and Paper Science and Technology, Faculty of Natural Resources, University of Tehran, Karaj, I.R. Iran
3 Master of Science, Department of Paper and Packaging, Faculty of Chemistry and Petrochemical Engineering, Standard Research Institute (SRI), Karaj, I.R. Iran
چکیده [English]

The aim of this study was to investigate the barrier properties of cellulose nanocrystals-PVA
nanocomposites. Nanocomposite films with different filler loading levels (3, 6, 9 and 12% by wt) were
developed by solvent casting method. The effect of cellulose nanocrystals on the barrier properties of
the nanocomposites was studied. To this end, moisture absorption, water vapor permeability (WVP),
oxygen transmission rate (OTR) and chemical vapor transmission rate (CVTR) of nanocomposite
films were measured. The results showed that adding cellulose nanocrystals improve barrier
properties, by reduction of the moisture absorption, WVP, OTR and CVTR of nanocomposites. These
improvements in the barrier properties of nanocomposites were attributed to the high crystallinity and
the strong interactions between the hydroxyl groups of cellulose nanocrystals and PVA chains,
indicating that the cellulose nanocrystals were well dispersed and adherent to the PVA matrix.
Furthermore, cellulose nanocrystals provide tortuous path for diffusing molecules to pass through the
film. Barrier properties improvement in fully hydrolyzed matrices was more significant than partially
hydrolyzed matrices.

کلیدواژه‌ها [English]

  • barrier properties
  • cellulose nanocrystals
  • chemical vapor transmission rate
  • oxygen transmission rate
  • water vapor permeability
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