اثر قطر الیاف بر تراوایی بخار آب و خواص ضدآب و ضدباد غشای الکتروریسی‌شده پلی(‌وینیلیدن ‌فلوئورید)

نوع مقاله: پژوهشی

نویسندگان

1 تهران، دانشگاه صنعتی امیرکبیر، دانشکده مهندسی نساجی، صندوق پستی ۴۴۱۳-۱۵۸۷۵

2 تهران، دانشگاه صنعتی امیرکبیر، دانشکده مهندسی شیمی، صندوق پستی ۴۴۱۳-۱۵۸۷۵

10.22063/jipst.2020.1703

چکیده

فرضیه: غشاهای ضدآب تنفسی در بسیاری از زمینه‌ها از جمله منسوجات محافظ و بیمارستانی و پوشاک ورزشی کاربرد دارند. تنفس‌پذیری منسوج، عامل مهمی در راحتی پوشاک است.
روش‌ها: در این پژوهش، غشاهای الکتروریسی‏شده پلی‌(وینیلیدن فلوئورید) با میانگین قطرالیاف 133، 203، 551 و 1018nm تولید و سپس خواص ضدآب‌، ضد‌باد و تنفس‌پذیری آ‌ن‌ها بررسی شد. برای الکتروریسی پلی‌(وینیلیدن فلوئورید) از حلال دی‌متیل‌سولفوکسید به‌عنوان جایگزینی با سمیت کمتر به‌جای حلال‌های رایج این پلیمر استفاده شد. درصد تخلخل، اندازه تخلخل‌ها، زاویه تماس قطره آب، نفوذپذیری هوا و فشار هیدروستاتیک نمونه‌ها اندازه‌گیری و ارزیابی شد. تراوایی بخار آب نمونه‌ها با روش گرماوزن‌سنجی بررسی شد.
یافته‌ها: فشار هیدروستاتیک نمونه‌ها با کاهش قطر الیاف (از 1018nm به 133nm) و در نتیجه آن کاهش اندازه منافذ غشا، به‌ترتیب از 10kPa به 100kPa افزایش یافت. نفوذپذیری هوای نمونه‌ها نیز با کاهش قطرالیاف، از 9mL/s.cm2  تا 1.4mL/s.cm2 در افت فشار 500kPa ، کم شد. نتایج بیانگر این است که غشاهای تولیدشده با الیاف ظریف‌تر خواص ضدآب و ضدباد بهتری را نشان می‌دهند. درحالی‌ که کاهش قطر الیاف و در نتیجه آن کاهش اندازه تخلخل‌های موجود در غشا به کاهش تنفس‌پذیری لایه منجر نشده و مقدار تراوایی بخار آب حدود  12.7kg/m2.day باقی مانده ‌است. بنابراین به‌نظر می‌رسد، سازوکار غالب انتقال بخار آب در این محدوده از اندازه تخلخل‌ها (761nm تا 3860nm)، نفوذ مولکولی و مستقل از اندازه قطر الیاف غشاست.

کلیدواژه‌ها


عنوان مقاله [English]

The Influence of Fibers Diameter on Water Vapor Permeability, Waterproof and Windproof Properties of Electrospun Poly(vinylidene fluoride) Membrane

نویسندگان [English]

  • Golchehr Amini 1
  • Mohammad Karimi 1
  • Farzin Zokaee Ashtiani 2
1 Department of Textile Engineering, Amirkabir University of Technology, P.O. Box 15875-4413, Tehran, Iran
2 Department of Chemical Engineering, Amirkabir University of Technology,, P.O. Box 15875-4413, Tehran, Iran
چکیده [English]

Hypothesis: Waterproof breathable membranes are used in different fields such as protective clothing, hospital textiles and sport wears. Breathability is an important factor in clothing comfort.
Methods: The influence of fiber diameter on breathability, waterproof and windproof properties of poly(vinylidene fluoride) membrane was investigated in this study. Hence, membranes composed of fiber with diameters of 133, 203, 551 and 1018 nm were produced through electrospinning process. It was attempted to use dimethyl sulfoxide as a green solvent in this process. Porosity, pore size, water contact angle, air permeability and hydrostatic pressure of the membranes were assessed. Thermogravimetric analysis (TGA) was employed to measure the water vapor permeability of the membranes.
Findings: The hydrostatic pressure of the membranes increased from 10 kPa to 100 kPa by reducing the fibers' diameter (from 1018 nm to 133 nm) and subsequently the pore size of the membranes. The air permeability of the samples decreased from 9 mL/s.cm2 to 1.4 mL/s.cm2 (at pressure drop of 500 Pa) with decreasing fiber diameter. The results showed that the membranes composed of finer fibers have better waterproof and windproof properties. This is while the reduction in fiber diameter and subsequently reduction in the pore size have not led to reduction in the breathability, and the amount of water vapor permeability remained approximately 12.7 kg/m2.day. Hence, it seems that the ordinary diffusion (molecular diffusion) is the dominant mechanism of water vapor diffusion in pore size ranging from 761 nm to 3860 nm and it is independent of the fiber diameter in the membranes

کلیدواژه‌ها [English]

  • protective clothing
  • waterproof
  • windproof
  • breathable
  • electrospun membrane
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