بررسی رفتار ویسکوالاستیک در رزین‌ها، پوشش‌های آلی و نانو کامپوزیت‌ها

نوع مقاله : مقاله مروری

نویسندگان

1 کارشناس ارشد، گروه پژوهشی رزین و افزودنی‌ها، پژوهشگاه رنگ

2 دانشیار، گروه پژوهشی رزین و افزودنی‌ها، پژوهشگاه رنگ

3 استادیار، گروه پژوهشی رزین و افزودنی‌ها، پژوهشگاه رنگ

چکیده

اغلب پوشش‌های آلی به‌دست آمده از تولید محصولات تجاری رنگ و پوشش، ویسکوالاستیک می‌باشند. مطالعه رفتار ویسکوالاستیک این پوشش‌ها بعد از پخت آنها یکی از آزمون‌های مهم است که اطلاعات مفیدی را در مورد عملکرد پوشش پخت شده در اختیار ما قرار می‌دهد. در این مقاله رفتار ویسکوالاستیک رزین‌ها، پوشش‌ها و نانوکامپوزیت‌های آنها با استفاده از دستگاه آنالیز دینامیکی، مکانیکی حرارتی(DMTA)  بررسی شده است. به کمک  DMTA مقادیر مدول ذخیره، مدول اتلاف و همچنین ترم اتلاف به عنوان تابعی از دما یا بسامد بدست می‌آیند. DMTA یک روش مفید برای بررسی ساختار پلیمر مانند متوسط وزن ملکولی بین زنجیرهای شبکه‌ای‌شده، چگالی شبکه‌ای‌شدن، میزان همگن یا ناهمگن بودن رزین‌های شبکه‌ای شده، میزان امتزاج‌پذیری در ترکیب رزین‌ها، میزان نسبی پراکنش نانوذرات در بستر رزین می‌باشد. همچنین کمیت‌های فیزیکی مختلفی مانند نقطه ژل‌شدن، دمای انتقال شیشه‌ای، چگالی شبکه‌ای‌شدن، درصد تبدیل پخت، گرانروی کمینه در حین فرآیند پخت، انرژی فعال‌سازی دمای انتقال شیشه‌ای، ضریب شکنندگی، ضریب جابجایی در رابطه ویلیام- لاندل- فری (WLF) و بررسی انتقال‌های α و β و γ به کمک DMTA مورد بررسی قرار می‌گیرد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Investigating Viscoelastic Behavior of Resins, Organic Coatings and Nanocomposites

نویسندگان [English]

  • Davood Ghanbari 1
  • Behzad Shirkavand Hadavand 2
  • Malihe Pishvaei 3
1 Department of Resin and Additives, Institute for Color Science and Technology
2 Department of Resin and Additives, Institute for Color Science and Technology
3 Department of Resin and Additives, Institute for Color Science and Technology
چکیده [English]

Most organic coatings obtained from commercial paint and coating products are viscoelastic. The study of the viscoelastic behavior of these coatings after curing is one of the important tests that provide useful information on the performance of the cured coating. In this paper the viscoelastic properties of resins, coatings and their nanocomposites using the dynamic mechanical thermal analysis (DMTA) is investigated. With DMTA, the values of storage modulus, loss modulus and also the loss term as a function of temperature or frequency are obtained. DMTA is a useful method for investigating the polymer structure, such as the average molecular weight of the cross-linked chains, cross-link density, the homogeneity or heterogeneity of the cross-linked resins, the degree of incompatibility in the resin composition, the distribution of nanoparticles in the resin matrix. Also different physical quantities such as gelatinization point, glass transition temperature, cross-link density, curing conversion percentage, minimum viscosity during curing process, energy of activation of glass transition temperature, brittleness coefficient, displacement coefficient in the William-Lundley-Fry (WLF) relation and investigation of α, β and γ transitions are investigated using DMTA.
 

کلیدواژه‌ها [English]

  • Viscoelastic Properties
  • DMTA
  • Organic coating
  • resin
  • Nanocomposite
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