پژوهش های کاربردی مهندسی شیمی - پلیمر
فصلنامه علمی - پژوهشی

ارزیابی نوچی و استحکام برشی چسب‌های فشارحساس متشکل از آمیخته پلی‌یورتان و کوپلیمر اکریلیکی

نوع مقاله : پژوهشی اصیل

نویسندگان

اسعد زندی
سمیه قاسمی راد

دانشگاه تربیت مدرس، دانشکده مهندسی شیمی، گروه مهندسی پلیمر

چکیده
موضوع تحقیق: در سال‌های اخیر مطالعات زیادی برای بهبود خواص چسبندگی چسب‌های فشار‌حساس (PSAهای) پلی‌یورتانی و اکریلیکی صورت گرفته است. به طور کلی، PSAهای پلی‌یورتانی از استحکام برشی بالاتر و PSAهای اکریلیکی از نوچی بالاتری برخوردارند. موضوع این پژوهش، امکان‌سنجی بهره‌برداری از خواص هر دوی این چسب‌ها از طریق روش ساده آمیخته‌سازی و ارزیابی دو خاصیت مذکور بود.

روش تحقیق: ابتدا کوپلیمر اکریلیکی (Ac) متشکل از 82 درصد حجمی بوتیل اکریلات و 18 درصد حجمی متیل متاکریلات به روش محلولی سنتز شد. از سوی دیگر، پلی‌یورتان گرمانرم (TPU) حاوی 5/17 درصد وزنی بخش سخت به روش توده تهیه شد. آمیخته‌سازی این دو پلیمر از طریق اختلاط محلول آن‌ها انجام شد. محلول پلیمرهای خالص و آمیخته‌های آن‌ها در ترکیب‌درصدهای متفاوت بر ‌لایه پلی‌اتیلن‌ترفتالات ریخته‌گری و در دمای محیط خشک شد. برای شناسایی پلیمرهای TPU و Ac از آزمون‌های طیف‌سنجی فروسرخ تبدیل‌ فوریه، کروماتوگرافی ژل‌تراوایی و گرماسنجی‌ پویشی تفاضلی استفاده شد. نوچی حلقوی، استحکام برشی استاتیک، رفتار دینامیکی‌ مکانیکی، زاویه تماس قطره ایستا، ریخت‌شناسی (Morphology) و کدری PSAها مورد ارزیابی قرار گرفت.

نتایج اصلی: نوچی PSA اکریلیکی از پلی‌یورتانی بالاتر بود. نوچی PSAهای آمیخته‌ای حاوی 20، 40 و 60 درصد وزنی TPU بالاتر از نوچی اجزای خالص و در آمیخته حاوی 40 درصد وزنی TPU بیشینه بود. این آمیخته نسبت به سایر آمیخته‌ها کمترین زاویه تماس آب و نسبت به پلیمرهای خالص کمترین زمان آسودگی را نشان داد که نتیجه آن تر‌شوندگی (Wetting) بهتر زیرآیند و نوچی بالاتر بود. استحکام‌ برشی PSA‌ها با افزایش مقدار TPU به بالاتر از 40 درصد وزنی در آمیخته‌ها نسبت به PSA اکریلیکی افزایش یافت؛ به طوری که TPU خالص با بالاترین مدول در بسامدهای مختلف و در نتیجه قرارگیری در منطقه PSA با استحکام برشی بالا در پنجره گرانروکشسانی چانگ، از بیشترین استحکام چسبندگی برخوردار بود. امتزاج‌ناپذیری آمیخته‌ها با آزمون کدری‌سنجی و محاسبه پارامتر حلالیت هنسن تأیید شد.

کلیدواژه‌ها

چسب فشارحساس
نوچی
استحکام برشی
آمیخته پلی‌یورتان/ اکریلیک
گرانروکشسانی

موضوعات

عنوان مقاله English

Evaluation of Tack and Shear Strength of Pressure-Sensitive Adhesives Comprised of Polyurethane and Acrylic Copolymer Blend

نویسندگان English

As'ad Zandi
Somayeh Ghasemirad
Polymer Engineering Department, Faculty of Chemical Engineering, Tarbiat Modares University
چکیده English

Research subject: In recent years, several studies have been performed for improving the adhesion properties of polyurethane and acrylic pressure-sensitive adhesives (PSAs). Generally, polyurethane PSAs are of higher shear strength, while acrylic PSAs have higher tack. This research is a feasibility study of exploiting the properties of both of these adhesives through a simple blending method, and the adhesion properties were evaluated.

Research approach: First, acrylic copolymer (Ac) consisting of 82 vol. % butyl acrylate and 18 vol. % methyl methacrylate was solution polymerized. On the other hand, a thermoplastic polyurethane (TPU) containing 17.5 wt. % hard segment was prepared by bulk polymerization. Blending of these two polymers was performed by solution mixing. Solutions of the pure polymers and their blends at different contents were cast on polyethylene terephthalate backing and dried at room temperature. Fourier transform infrared spectroscopy, gel permeation chromatography, and differential scanning calorimetry were used to identify TPU and Ac. Loop tack, static shear strength, dynamic mechanical behavior, contact angle of sessile drop, morphology, and haze of the PSAs were evaluated.

Main results: Tack of the acrylic PSA was higher than TPU PSA. Tack of the blend PSAs containing 20, 40, and 60 wt. % TPU was higher than the pure components and that of the blend containing 40 wt. % TPU was maximum. This blend demonstrated the lowest water contact angle compared to the other blends and the shortest relaxation time compared to the pure polymers, which resulted in better wetting and higher tack. The shear strength of the PSAs increased with increase in the content of TPU to higher than 40 wt. % in the blends compared to the acrylic PSA; so that the pure TPU showed the highest modulus at various frequencies and hence exhibited high-shear PSA characteristics in the Chang’s viscoelastic window and the highest adhesion strength. The immiscibility of the blends was confirmed by measuring the haze and calculating the Hansen solubility parameter.

کلیدواژه‌ها English

Pressure-sensitive adhesive
Tack
Shear Strength
Polyurethane/acrylic blend
Viscoelasticity
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پژوهش های کاربردی مهندسی شیمی - پلیمر
دوره 5، شماره 4 - شماره پیاپی 18
اردیبهشت 1400
صفحه 55-67

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