بهینه سازی تولید نانوالیاف کامپوزیتی پلی وینیل الکل/ نانوبنتونیت با هدف بهبود خواص مکانیکی و حرارتی

نوع مقاله : پژوهشی اصیل

نویسندگان

1 دانشگاه تهران

2 دانشگاه حکیم سبزواری

چکیده
تتولید الیاف در مقیاس نانومتری (نانوالیاف) سطح تماس بسیار زیادی را ایجاد می کند و موجب بهبود خواص آن‌ها نسبت به الیاف معمول می‌شود. الکتروریسی یک روش نسبتاٌ ساده و موًثر برای سنتز نانوالیاف با قطرهای مختلف است. با تغییر عوامل تاثیرگذار بر فرایند الکتروریسی شامل متغیرهای محیطی، دستگاهی و محلول، می‌توان الیافی با مورفولوژی مختلف تولید کرد. پلی وینیل الکل (PVA) به دلیل پایداری حرارتی بالا، زیست سازگاری، غیر سمی بودن و حلالیت در آب مورد توجه واقع شده است. افزودن بنتونیت به PVA باعث بهبود خواص آن می شود. در این پژوهش برای تهیه غشاء نانوالیاف PVA و نانوبنتونیت، مقادیر بهینه سه متغیر مؤثر بر فرایند شامل ولتاژ، نرخ تغذیه و غلظت بنتونیت بر اساس موفولوژی و خواص مکانیکی نانوالیاف تعیین شد. نتایج نشان داد که در شرایط ولتاژ kV 11، نرخ تغذیه mL/h 5/0 و غلظت بنتونیت w/w 3% الیافی با مناسب ترین موفولوژی و بیشترین استحکام بدست می آید. در این شرایط نانوالیاف تولیدی قطری برابر 243 نانومتر با انحراف معیار 0551/0 و تحمل کشش MPa 64/7را دارند. نتایج این مطالعه نشان داد که افزودن مقدار کمی بتنونیت به PVA باعث استحکام بیشتر نانوالیاف تولیدی می شود. در اثر افزودن بنتونیت قطر نانوالیاف از 308 به 243 نانومتر کاهش می یابد. بنابراین نانوالیاف کامپوزیتی PVA/نانوبنتونیت تولید شده یک غشا مناسب برای تصفیه آب است.

کلیدواژه‌ها

موضوعات


عنوان مقاله English

Optimization of PVA/Nano-Bentonite Nanofiber Composite Production for Improving Mechanical and Thermal Properties

نویسندگان English

Soheila Mahdizadeh 1
Zahra-Beagom Mokhtari-Hosseini 2
Ashrafalsadat Hatamian-Zarmi 1
Bahman Ebrahimi-Hosseinzadeh 1
1 University of Tehran
2 Hakim Sabzevari University
چکیده English

Fiber production in nanoscale prepares high surface contact for fibers and leads to the improvement of their properties with respect to other fibers. A convenient and effective method for nanofiber production with different diameters is electrospinning. Various effective parameters on electrospinning processes, including environmental, equipment, and solution variables can produce fibers with different morphologies. PVA has been used in various fields of applied research because of its high thermal stability, biocompatibility, non-toxic and solubility in water. The published reports indicated that properties of the PVA are improved with the addition of bentonite. In this research, to prepare PVA/nano-bentonite nanofiber membrane, the optimum amounts of three effective variables on the above-mentioned processes were determined. According to the obtained results, the voltage of 11 kV, the feeding rate of 0.5 mL/h and bentonite concentration of 3% w/w were optimum conditions for the process of PVA/nano-bentonite nanofiber composite production. In this condition, the average diameter of produced nanofibers was 243 nm with the standard deviation of 0.0551 and the tensile strength of 7.64 MPa. The results showed that the addition of bentonite to PVA increase intensity of nanofibers and decrease the diameter of nanofibers from 308 nm to 243nm.Therfore, the produced PVA/bentonite nanofiber composite is a good membrane for water treatment.

کلیدواژه‌ها English

Nanofiber
Electrospinning
PVA
Bentonite
Montmorillonite
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