اثر استخراج‌کننده، سرعت ریسیدن و سرعت جریان سیال سوراخ‌کننده بر ساختار و عملکرد غشای الیاف توخالی پلی‌اتیلنی کم‌چگالی خطی

نوع مقاله: پژوهشی

نویسندگان

1 بناب، دانشگاه بناب، دانشکده فنی و مهندسی، گروه مهندسی شیمی، کد پستی 5551761167

2 تبریز، دانشگاه صنعتی سهند تبریز، دانشکده مهندسی شیمی، صندوق پستی 1996-51335

3 بناب، دانشگاه بناب، دانشکده فنی و مهندسی، گروه مهندسی پلیمر، کد پستی 5551761167

چکیده

فرضیه: غشاهای الیاف توخالی پلیمری با داشتن نسبت سطح به حجم زیاد، ساختارهای مناسبی در فناوری غشایی هستند. پلی‌اتیلن کم‌چگالی خطی به‌دلیل خواص ویژه‌ای که دارد، می‌تواند پلیمر مناسبی برای ساخت غشای الیاف توخالی با روش جدایی فاز گرماالقایی باشد. هدف این کار بررسی اثر استخراج‌کننده، سرعت ریسیدن و سیال سوراخ‌کننده بر ساختار و عملکرد غشای پلی‌اتیلن کم‌چگالی خطی است.
روش‌ها: پلی‌اتیلن کم‌چگالی خطی و روغن معدنی به‌عنوان رقیق‌کننده گرمادهی شدند تا محلول همگنی حاصل شود، سپس به داخل قالب شکل‌دهنده تزریق شدند. الیاف توخالی پس از خروج از قالب ‌شکل‌دهنده وارد حمام انعقاد شده سپس با استخراج‌کننده‌های مختلف استخراج شدند. اثر اتانول، هگزان و استون با پارامترهای حل‌پذیری متفاوت بر ساختار غشاها مطالعه شد. در ادامه، اثر سرعت ریسیدن و سرعت جریان سیال سوراخ‌کننده بر ساختار و عملکرد غشای استخراج‌شده با استون بررسی شد.
یافته‌ها: غشاهای استخراج‌شده با اتانول تخلخل و تراوایی آب خالص کمی نشان دادند، بدین معنی که اتانول قابلیت استخراج رقیق‌کننده از ساختار غشا را ندارد. هگزان نیز به‌دلیل داشتن پارامتر حل‌پذیری مشابه با پلی‌اتیلن کم‌چگالی خطی موجب تورم بخش بی‌شکل پلیمر و بسته‌شدن حفره‌های غشا شد. در حالی که استون به‌طور مؤثر رقیق‌کننده را از ساختار غشا خارج کرده است. تصاویر SEM نیز ساختار متخلخل غشا را تأیید کردند. سایر نتایج نشان داد، با ازدیاد سرعت ریسیدن، تراوایی آب خالص، زبری سطح و استحکام کششی غشاهای الیاف توخالی افزایش می‌یابد. افزایش سرعت تزریق سیال سوراخ‌کننده نیز به بهبود استحکام مکانیکی و کاهش تراوایی آب غشاها منجر شد. در نهایت مشخص شد، مقدار پس‌زنی پروتئین کلاژن به‌وسیله غشاهای ساخته‌شده با افزایش سرعت جریان سیال سوراخ‌کننده افزایش یافته و با افزایش سرعت ریسیدن کاهش ناچیزی بافت.

کلیدواژه‌ها


عنوان مقاله [English]

Effect of Extractant, Take-up Speed and Bore Fluid Flow Rate on the Structure and Performance of LLDPE Hollow Fiber Membrane

نویسندگان [English]

  • Elham Shokri 1
  • Zahra Shoeyb 2
  • Reza Yegani 2
  • Habib Etemadi 3
1 Department of Chemical Engineering, Faculty of Engineering, University of Bonab, Postal Code 5551761167, Bonab, Iran
2 Faculty of Chemical Engineering, Sahand University of Technology, P.O. Box 51335-1996, Tabriz, Iran
3 Department of Polymer Science and Engineering, Faculty of Engineering, University of Bonab, Postal Code 5551761167, Bonab, Iran
چکیده [English]

Hypothesis: Polymeric hollow fiber membranes with high area per unit volume are proper configurations in membrane technology. Linear low density polyethylene (LLDPE) with specific properties is a suitable polymer for fabrication of hollow fiber membrane through thermally-induced phase separation method. The aim of this study was to evaluate the effect of different extractants, take-up speed and bore fluid flow rate on the structure and performance of LLDPE hollow fiber membranes.
Methods: The LLDPE and mineral oil were heated in order to obtain a homogeneous solution and fed to spinneret. The hollow fiber extruded from the spinneret entered into a coagulation bath and then extracted by different extractants. The effects of ethanol, hexane and acetone with different solubility parameters were studied on the structure of membranes. In the following, the effect of take-up speed and bore fluid flow rate was studied with respect to the structure as well as performance of membranes extracted with acetone.
Findings: Membranes extracted with ethanol showed low porosity and water permeability which implied that ethanol cannot extract diluent. Due to similar solubility parameter of hexane and LLDPE, hexane swells the amorphous region of the polymer and it blocks the pores. Acetone extracted the diluent successfully and the SEM images confirmed porous structure of the membranes. The other results showed that pure water permeability, surface roughness and tensile strength of the hollow fiber membranes increased when the take-up speed was increased. In addition, raising the bore fluid flow rate improved the strength of the membrane while it reduced the water permeability. Finally, it was revealed that the rejection of membranes in the separation of collagen protein solution was increased by increasing bore fluid flow rate and also decreased slowly by increasing the take-up speed.

کلیدواژه‌ها [English]

  • linear low density polyethylene
  • hollow fiber membrane
  • extractant
  • take-up speed
  • bore fluid flow rate
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