پژوهش های کاربردی مهندسی شیمی - پلیمر
فصلنامه علمی - پژوهشی

اصلاح مستقیم سطوح پلی‌اتیلن به وسیله پلاسمای غیرتعادلی جرقه لغزان در فشار اتمسفر با گاز هوا

نوع مقاله : پژوهشی اصیل

نویسندگان

فائزه قهرمان نژاد 1
بابک محمدحسینی 1
محمدرضا خانی 2
جابر خانجانی 3

1 گروه فیزیک، دانشکده علوم، دانشگاه بین المللی امام خمینی (ره)

2 پژوهشکده لیزر و پلاسما، دانشگاه شهیدبهشتی تهران

3 گروه مواد، شیمی و پلیمر، مرکز فنی مهندسی بوئین زهرا

چکیده
موضوع تحقیق: سطوح پلی‌اتیلن را اغلب به دلایل مختلفی همانند پاکسازی و حکاکی سطح[1]، تغییر عملکرد سطح و رسوب سطحی اصلاح می‌کنند. یکی از سطوحی که در کاربردهای ظروف بادی می‌بایست اصلاح شود تا چسبندگی مناسب برچسب‌ها به آن محقق شود، سطوح بطری‌های شوینده‌های بهداشتی است که مورد هدف این پژوهش است. در این مقاله از دستگاه پلاسمای جرقه لغزان در فشار اتمسفر با گاز هوا برای اصلاح سطح ورقه‌های پلی‌اتیلن به منظور ایجاد تغییر در ساختار آن‌ها استفاده شده‌است.

روش‌ تحقیق: به منظور بررسی تغییرات ایجاد شده در شیمی و فیزیک سطح پلی‌اتیلن بعد از اصلاح پلاسمایی از آزمون های مختلفی مانند­­­­­­­­­­­ آزمون‌هایAFM ­، SEM وXPS استفاده شده‌است. همچنین آزمون طیف‌سنجی گسیل نوری(OES) برای شناسایی عناصر پلاسما استفاده شده‌است.

نتایج اصلی: زاویه تماس[2] بین قطره آب و سطح پلی‌اتیلن بعد از‌ 40 ثانیه‌ اصلاح به96/46‌ درجه رسیده‌است، در حالی که این زاویه تماس قبل از اصلاح پلاسمایی 53/66 درجه بوده‌است. کاهش در اندازه زاویه تماس قطره آب و سطح نمونه، بیانگر آبدوست شدن سطح پلی‌اتیلن بعد از اصلاح پلاسمایی است. با استفاده از روش ‌Owens-Wendt-Rabel Kaelble انرژی سطحی پلی‌اتیلن قبل و بعد از اصلاح پلاسمایی محاسبه شده‌است. انرژی سطحی پلی‌اتیلن از‌mj.m-2 20/42 در نمونه کنترل به mj.m-2 32/60 در نمونه اصلاح شده افزایش پیدا کرده‌است. افزایش در زبری سطح نمونه اصلاح شده با پلاسمای جرقه لغزان توسط آزمون AFM تأیید شد. زبری سطح پلی‌اتیلن در نمونه کنترل nm18/47 بوده درحالی که، زبری در نمونه اصلاح شده به nm 86/59 افزایش یافته‌است. آزمون XPS حضور گروه‌های‌عاملی اکسیژن‌دار و نیتروژن‌دار را روی سطح نمونه اصلاح شده تأیید کرد. همچنین این آزمون تشکیل پیوندهای C−C=O و C−O−C را در سطح پلی‌اتیلن اصلاح شده، نشان داد.


[1] Cleaning and etching

[2] Contact angle

کلیدواژه‌ها

پلاسمای جرقه لغزان
پلی‌اتیلن
انرژی سطحی
آب دوستی
زبری سطح

موضوعات

عنوان مقاله English

Direct modification of polyethylene surfaces using non-equilibrium gliding arc plasma with air at atmospheric pressure

نویسندگان English

Faeze Ghahremannezhad 1
Babak Mohammadhosseini 1
Mohammad Reza Khani 2
Jaber Khanjani 3
1 Department of Physics, Faculty of Science, Imam Khomeini International University (RA)
2 Laser and Plasma Research Institute, Shahid Beheshti University, Tehran
3 Department of Materials, Chemistry and Polymer, Bouin Zahra Engineering Technical Center
چکیده English

Research subjec: Polyethylene surfaces are often modified because of different reasons such as cleaning, etching, change in the performance of the surface, and surficial precipitation. One of the surfaces in the blow molded applications that must be treated in order to be ready for the adhesion of the labels is the surface of the bottle of the hygiene detergents, being the purpose of this research. In this paper, gliding arc plasma device is used at atmospheric pressure with air gas to modify the surface of polyethylene sheets in order to change their structure.

Methods: Various analyzes such as AFM, SEM and XPS tests have been used to investigate the changes in the chemistry and physics of polyethylene surface after plasma modification. Optical emission spectroscopy (OES) has also been used to identify plasma elements.

Findings: The contact angle between the water droplet and the polyethylene surface reached 46.96 ° after 40 s of treatment, while this contact angle was 66.53 °‌ before plasma treatment. The decrease in the contact angle size of the water droplet and the sample surface indicates the hydrophilicity of the polyethylene surface after plasma modification. The surface free energy of polyethylene was calculated before and after plasma modification using the Owens-Wendt-Rabel Kaelble method. The surface energy of polyethylene has increased from 42.20 mj.m-2 in the control sample to 60.32 mj.m-2 in the modified sample. The increase in surface roughness of the modified sample with gliding arc plasma was confirmed by AFM test. The surface roughness of polyethylene in the control sample was 47.18 nm, while the roughness in the modified sample increased to 59.86 nm. The XPS test confirmed the presence of oxygenated and nitrogenous functional groups on the surface of the modified sample. This test also showed the formation of C−C=O and C−O−C bonds on PE surface.

کلیدواژه‌ها English

Plasma gliding arc
Polyethylene
Surface energy
Hydrophilicity
Surface roughness
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