اصلاح شلتوک برنج با لاتکس میکروژل شبکه‌ای‌شده گلیسیدیل برای تهیه هیدروژل هیبریدی

نوع مقاله: پژوهشی

نویسندگان

تهران، پژوهشگاه پلیمر و پتروشیمی ایران، پژوهشکده فرایند، گروه رنگ و روکش‌های سطح، صندوق پستی 112-14975

چکیده

هدف اصلی مقاله معرفی روش جدیدی برای تبدیل پلیمر طبیعی به هیدروژل هیبریدی است. هیدروژل‌های هیبریدی معمولاً از کوپلیمرشدن پیوندی مونومرهای آکریلی بر پلیمر طبیعی به‌دست می‌آیند. در این پژوهش، شلتوک برنج برای تهیه هیدروژل هیبریدی به‌کار گرفته شد. شلتوک برنج به‌عنوان منبع پلی‌ساکارید، به‌وسیله میکروژل‌های پلیمری بر پایه مونومرهای آکریلی مانند آکریلیک اسید، آکریل آمید و 2-آکریل آمیدو-2-متیل پروپان سولفونیک اسید اصلاح شد که با فرایند پلیمرشدن امولسیون وارون تهیه شدند. این فرایند سبب تبدیل ماده کم‌ارزش به هیدروژل نیمه‌سنتزی می‌شود. اثر نوع لاتکس روی ظرفیت تورم هیدروژل‌های هیبریدی بررسی شد. واکنش شیمیایی بین شلتوک و لاتکس آکریلی با گرمادهی انجام شد که موجب به‌دست‌آمدن هیدروژل نیمه‌سنتزی با %51 جزء طبیعی و %49 جزء سنتزی شد. در بین لاتکس‌های استفاده شده با ساختارهای مختلف، پلی‌(NaAA-AA-AM-AMPS) مناسب‌ترین لاتکس پلیمری برای تبدیل شلتوک برنج به هیدروژل است. شلتوک اصلاح‌شده با این لاتکس دارای مقدار جذب آب تا 35.8 و12.7g/gبه ترتیب در آب مقطر و محلول آب نمک %0.9 است، در حالی که شلتوک برنج اصلاح‌نشده بدون هیچ خاصیت تورمی است. از نقاط ضعف هیدروژل‌های هیبریدی استحکام مکانیکی کم آن‌هاست که برای بهبود آن از روش شبکه‌ای‌شدن سطحی با استفاده از عامل شبکه‌ای‌کننده اتیلن گلیکول دی‌‌‌گلیسیدیل اتر بر هیدروژل‌های هیبریدی استفاده شد. AUL هیدروژل هیبریدی شبکه‌ای ‌شده سطحی تا %27 افزایش یافت. هیدروژل‌های هیبریدی با استفاده روش‌های شناسایی طیف‌سنجی زیرقرمز تبدیل فوریه (FT-IR)، آزمون گرماوزن‌سنجی (TGA) و میکروسکوپی الکترونی پویشی (SEM) بررسی و شناسایی شدند.

کلیدواژه‌ها


عنوان مقاله [English]

Modification of Rice Husk with Glycidyl Crosslined Microgel Latex for Preparation of Hybrid Hydrogel

نویسندگان [English]

  • Mojdeh Ashkani
  • Kouroush kabiri
  • Ali Salimi
  • Hossein Bouhendi
Iran Polymer and Petrochemical Institute, P.O. Box: 14975-112, Tehran, Iran
چکیده [English]

Hypothesis: The main objective of this project was the development of a new method for converting natural polymers into hybrid hydrogels. The hybrid hydrogels are usually prepared through grafting of acrylic monomers onto pure polysaccharides, and this study was performed using rice husk to prepare semi-synthetic hybrid hydrogels.
Methods: Rice husk as a source of polysaccharide was modified with acrylic latexes that were prepared through inverse emulsion polymerization with the use of acrylic monomers such as acrylic acid, acrylamide and 2-acrylamido-2-methyl propane sulfonic acid. This process resulted in the conversion of low-value material into a value added semi-synthetic hydrogel product. Low absorbency under load (AUL) was the main weakness of hybrid hydrogels. The hybrid hydrogels were surface crosslinked through ethylene glycol diglycidyl ether (EGDGE) as surface crosslinker to improve AUL.
Findings: The effect of latex type on the swelling capacity of hybrid hydrogels was investigated. The chemical reaction between rice husk and acrylic latex was carried out in modification process of rice husk. The obtained semi-synthetic hydrogel constituted of 51% natural part and 49% synthetic part. Among the microgel latexes with different structures, the poly (NaAA-AA-AM-AMPS) was the most suitable polymer latex for the conversion of rice husk into hydrogel. The swelling of this hybrid hydrogel was 35.8 and 12.7g/g in distilled water and saline solution, respectively, whereas the unmodified rice husk showed no water absorption capability. AUL of surface crosslinked hybrid hydrogels was increased up to 27%. The hydrogels were characterized by Fourier transform infrared spectroscopy (FTIR), thermal gravimetric analysis (TGA) and scanning electron microscopy (SEM). These hydrogels, which were prepared directly from natural polymers, showed great potentials in agricultural systems applications.

کلیدواژه‌ها [English]

  • hybrid hydrogel¸ inverse emulsion polymerization
  • surface crosslinking
  • rice husk
  • microgel latex

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