اثر نانوذرات گرافن اکسید بر خواص فیزیکی و مکانیکی فیلم‌های بر پایه کیتوسان، ژلاتین و پلی‌وینیل الکل

نوع مقاله : پژوهشی

نویسندگان

گروه مهندسی پلیمر، دانشکده فنی مهندسی، واحد شهرضا، دانشگاه آزاد اسلامی، شهرضا، کد پستی 46411-86481

چکیده

فرضیه: گرافن اکسید به‌عنوان یکی از نانوذرات مهم با داشتن مشخصات بی‌نظیر و قابلیت بهبود خواص فیزیکی و مکانیکی انواع زیست‌پلیمرها در دهه اخیر بسیار مورد توجه قرار گرفته است. بنابراین، در پژوهش حاضر از گرافن اکسید برای اصلاح فیلم‌های پلیمری بر پایه کیتوسان-ژلاتین-پلی‌وینیل الکل استفاده شده است.
روش‌ها: فیلم‌های پلیمری با ترکیب درصدهای مختلف با روش ریخته‌گری تهیه‌ شدند. گرافن اکسید به مقدارهای 0، 0.2، 0.4 و %0.8 وزنی به محلول‌ها اضافه شد. فیلم‌های تهیه‌شده با آزمون‌های کشش، سنجش تورم، سرعت عبورپذیری بخار آب، ضدباکتری و میکروسکوپی الکترونی پویشی بررسی شدند.
یافته‌ها: نتایج آزمون کشش نشان داد، گرافن اکسید موجب بهبود مدول و استحکام کششی شد. اما، ازدیاد طول تا پارگی نمونه‌ها کاهش یافت. همچنین، افزایش مقدار پلی‌وینیل الکل موجب کاهش خواص مکانیکی فیلم‌ها شد. نتایج آزمون تورم در سه محیط مختلف (خنثی، اسیدی و بازی) نشان داد، پلی‌وینیل الکل موجب کاهش تورم شد و با افزایش بیشتر گرافن اکسید نیز تورم فیلم‌ها به‌طور شایان توجهی کاهش یافت. نتایج آزمون سرعت عبورپذیری بخار آب نشان داد، با تغییر ترکیب درصد فیلم کامپوزیت تغییر شایان توجهی در سرعت عبورپذیری بخار آب فیلم‌ها دیده نشد. اما، استفاده از گرافن اکسید موجب کاهش سرعت عبورپذیری بخار آب در نمونه‌ها شد. نتایج آزمون ضدباکتری نشان داد، افزودن پلی‌وینیل الکل به تغییر محسوسی در قطر هاله عدم رشد منجر نشد، در حالی که با افزودن گرافن اکسید  قطر هاله عدم رشد ابتدا افزایش یافت که حاکی از خاصیت مؤثر ضدباکتری نانوذرات گرافن اکسید است. نتایج میکروسکوپی الکترونی پویشی توزیع یکنواخت نانوذرات گرافن اکسید در فیلم‌های پلیمری را در درصدهای کم به‌دلیل سازگاری گرافن اکسید با ماتریس پلیمری نشان داد.

کلیدواژه‌ها

عنوان مقاله [English]

Effect of Graphene Oxide Nanoparticles on the Physical and Mechanical Properties of Chitosan/Gelatin/Polyvinyl Alcohol Films

نویسندگان [English]

  • Sorror Ghanavati
  • Hossein Izadi-Vasafi
Department of Polymer Engineering, Faculty of Engineering, Shahreza Branch, Islamic Azad University, Postal Code 86481-46411, Isfahan, Iran
چکیده [English]

Hypothesis: Graphene oxide (GO) as an important nanoparticle having unique characteristics and the ability to improve physical and mechanical properties of different biopolymers has been taken into consideration during the last decade.  Thus, in this study, graphene oxide was used for the modification of polymeric films based on chitosan (CS)/gelatin (GL)/polyvinyl alcohol (PVA).
Methods: Two series of films with different composition ratios were prepared by solution casting method. Graphene oxide at different concentrations (0, 0.2, 0.4 and 0.8 wt%) was added to the solutions to investigate the effect of PVA and GO amounts on the physical and mechanical properties of the films. The synthesized films were investigated by tensile, swelling, water vapor transmission rate (WVTR), antibacterial and scanning electron microscopy (SEM) tests.
Findings: The tensile results showed that the graphene oxide improved the mechanical properties such as tensile modulus and strength, while decreased the elongation-at-break of the prepared samples. The increase in the PVA content of the films led to lower mechanical properties in films. The results of swelling tests at three different (neutral, acidic, and basic) media showed that the PVA led to the decrement of swelling, and higher amounts of GO resulted in a considerable decrease in degree of swelling of the films. The WVTR results showed that the changing in film composition did not considerably change the WVTR of the films, while the GO resulted in a decrease in WVTR of the samples. The antibacterial results showed that adding PVA did not affect the inhibition zone diameter, meanwhile the addition of graphene oxide led to an increase of the inhibition zone diameter. The SEM results showed a uniform distribution of GO nanoparticles within the polymeric films which was due to the compatibility of GO with polymeric matrix.

کلیدواژه‌ها [English]

  • chitosan
  • gelatin
  • polyvinyl alcohol
  • graphene oxide
  • mechanical properties

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مجله علوم و تکنولوژی پلیمر
دوره 33، شماره 1 - شماره پیاپی 165
فروردین و اردیبهشت 1399
صفحه 75-87

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