هیدروژل ابرجاذب پلی‌آکریل آمید سولفون‌دار-آلومینیم نیترات: خواص تورمی، مکانیکی، گرمایی و ساختاری

نوع مقاله: پژوهشی

نویسندگان

1 تهران، پژوهشگاه شیمی و مهندسی شیمی ایران، پژوهشکده مهندسی نفت، صندوق پستی 186-14335

2 تهران، دانشگاه آزاد اسلامی، واحد تهران مرکز، دانشکده فنی و مهندسی، گروه شیمی، صندوق پستی 466-19585

3 اصفهان، دانشگاه صنعتی اصفهان، دانشکده مهندسی شیمی، گروه مهندسی شیمی، صندوق پستی 83111-84156

چکیده

پژوهش حاضر با هدف ساخت نمونه آزمایشگاهی هیدروژل با تورم‌پذیری زیاد و حفظ ساختار سه‌بعدی در برابر شرایط محیطی انجام ‌شد. روش‌ها در پژوهش حاضر نخست برپایه طراحی و ساخت شبکه سه‌بعدی هیدروژل ابرجاذب با استفاده از پلیمر آکریل‌آمید سولفون‌دار آبکافت شده و آلومینیم نیترات 9 آبه به‌عنوان عامل شبکه‌ساز و درنهایت تحلیل داده‌ها و تعیین هیدروژل بهینه با استفاده از روش پاسخ سطح بوده است. به‌عبارت‌ دیگر، با طراحی مجموعه آزمون‌ها و با استفاده از روش پاسخ سطح، هیدروژل بهینه برحسب سه پاسخ زمان تشکیل، زمان چروکیدگی و مقدار تورم شناسایی شد که البته خواص شیمیایی و شکل‌شناسی هیدروژل ابرجاذب بهینه با استفاده از روش بطری (تورم و چروکیدگی)، رئولوژی، طیف‌سنجی تفکیک انرژى (EDS) و آزمون گرماوزسنجی (TGA) معین شد. نتایج نشان داد، هیدروژل بهینه ماده‌ای با غلظت 40000ppm از پلیمر شامل 6wt% عامل شبکه‌ساز است. زمان چروکیدگی هیدروژل ابرجاذب بهینه حاصل بیش از 180 روز، مقدار تورم 2800 برابر وزن ماده خشک اولیه، مدول کشسانی 15240Pa و پایداری گرمایی تا دمای  325 درجه سلسیوس بود. در این پژوهش، بیشترین مقدار تورم (4000 برابر وزن خشک هیدروژل ابر جاذب) در ترکیب هیدروژل با غلظت 20000ppm پلی‌آکریل آمید و با نسبت وزنی 6 به 100 آلومینیم نیترات 9 آبه به پلیمر مشاهده شد. اما، زمان چروکیدگی آن (کمتر از 10 روز) مانع از انتخاب این ترکیب از دو ماده به‌عنوان غلظت بهینه شد. همچنین، نسبت وزنی عامل شبکه‌ساز به پلیمر به‌عنوان کنترل‌کننده زمان تشکیل و چروکیدگی هیدروژل و غلظت پلیمر پارامتر اصلی در کنترل مقدار تورم، معرفی شد. پلی‌آکریل آمید و با نسبت وزنی 6 به 100 آلومینیم نیترات نه آبه به پلیمر مشاهده شد، اما زمان چروکیدگی آن (کمتر از 10 روز) مانع از انتخاب این ترکیب از دو ماده به عنوان غلظت بهینه شد. همچنین، نسبت وزنی عامل شبکه‌ساز به پلیمربه‌عنوان کنترل‌کننده زمان تشکیل و چروکیدگی هیدروژل و غلظت پلیمر پارامتر اصلی در کنترل مقدار تورم معرفی شد.

کلیدواژه‌ها


عنوان مقاله [English]

Superabsorbent Sulfonated Polyacrylamide/Aluminum Nitrate Hydrogel: Swelling, Mechanical, Thermal and Structural Properties

نویسندگان [English]

  • Mahsa Baghban Salehi 1
  • Delara Ehsani Sohi 2
  • Mayram Otadi 2
  • Majid Abedi Lengi 3
1 Department of Petroleum Engineering, Chemistry and Chemical Engineering Research Center of Iran, P. O. Box: 14335-186, Tehran, Iran
2 Department of Chemical Engineering, Central Tehran Branch, Islamic Azad University, P. O. Box: 19585-466, Tehran, Iran
3 Department of Chemical Engineering, Isfahan University of Technology, P. O. Box: 84156-83111, Isfahan, Iran
چکیده [English]

A hydrogel was prepared with high swelling capacity and a stable three-dimensional structure under environmental conditions. The methodology in this study involved the design and construction of a three-dimensional network for a superabsorbent hydrogel using hydrolyzed sulfonated polyacrylamide as polymer and nonahydrate aluminum nitrate as crosslinker. Further methodology involved data analysis to achieve a hydrogel optimized by response surface methodology. The optimum hydrogel in terms of three responses (i.e., gelation time, syneresis and swelling) was identified by designing a series of experiments. The chemistry and morphology of optimal superabsorbent hydrogel was determined by bottle tests (swelling and syneresis), rheology, energy dispersive spectroscopy (EDS), and thermogravimetric analysis (TGA). The results of this study demonstrated its polymer concentration of 40,000 ppm and crosslinker concentration of 6 wt% for preparation of optimum hydrogel. The syneresis of the optimum hydrogel was more than 180 days and it swelled to 2800-times of its initial dry weight; its elastic modulus was 15240 Pa with thermal stability by 325°C. The highest swelling rate (4000-times of the dry weight) was observed for a hydrogel with a polyacrylamide concentration of 20000 ppm and a weight ratio of 6 wt% of crosslinker to polymer. An undesirable syneresis time of less than 10 days was obtained. Moreover, the main factor in controlling the gelation time and syneresis was the weight ratio of crosslinker to polymer, while for controlling the swelling capacity it was found to be polymer concentration.

کلیدواژه‌ها [English]

  • superabsorbent hydrogel
  • swelling
  • syneresis
  • Rheology
  • thermal stability

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