مطالعه رئولوژیکی پلاستی‌سول پلی‌وینیل‌کلراید: بررسی ساختار ژل در دمای اتاق

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه پژوهشی رزین و افزودنی‌ها، پژوهشگاه رنگ، تهران، ایران، صندوق پستی: 654-16765

چکیده

مطالعه رئولوژی ‌پلاستی‌سول پلی‌وینیل‌کلراید حائز اهمیت است، زیرا در ابتدا حالت خمیری دارد و معمولا به روش افشاندن اعمال می‌شود. همچنین کنترل فرایند‌ها‌ی ژل و ذوب نیز با استفاده از رئولوژی امکان‌پذیر ‌می‌شود. در این پژوهش رفتار رئولوژیکی ‌پلاستی‌سول‌ها شامل رفتار رقیق شوندگی با سرعت برش، تیکسوتروپی و رفتار ژل بررسی گردید. همچنین پیر شدگی‌ها‌ی طولانی مدت مطالعه شد و مشخص گردید ‌پلاستی‌سول‌ها‌ در دمای ثابت در مدت زمان طولانی مطابق با مفهوم برهم نهی دما-زمان به ژل تبدیل می‌شوند. در نهایت ارتباط تیکسوتروپی و تنش تسلیم نمونه‌ها‌ برای مطالعه ساختار ژل فیزیکی مورد ارزیابی قرار گرفت. نتایج تایید می‌کند که تیکسوتروپی و تنش تسلیم در ‌پلاستی‌سول‌ها‌ی پلی‌وینیل‌کلراید ناشی از فیزیک بنیادی یکسان این عوامل است و این مربوط به استحکام ریزساختار می‌شود.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

A Rheological Study of Poly(Vinyl chloride) Plastisols: Investigating the Gel Structure at Room Temperature

نویسندگان [English]

  • Behrooz Eftekhari
  • Malihe Pishvaei
Department of Resin and Additives, Institute for Color Science and Technology, P.O.Box: 16765-654, Tehran, Iran
چکیده [English]

The study of the rheology of polyvinyl chloride plastisol is important because, at first, it is in a paste state and is usually applied by spraying. Moreover, controlling the gel and melting processes is possible by using rheology. This research investigated the rheological behavior of plastisols, including shear thinning behavior, thixotropy and gelation behavior. Also, long-term ageing was studied and it was found that plastisols turn into gel at a constant temperature for a long time period according to the concept of time-temperature superposition. Finally, the relationship between the samples' thixotropy and yield stress was evaluated to study the physical gel structure. The results confirm that thixotropy and yield stress in PVC plastisols are the same due to the fundamental physics and this is related to the strength of the microstructure.

کلیدواژه‌ها [English]

  • Polyvinyl chloride plastisol
  • Gelation
  • Rheology
  • Yield stress
  • Thixotropy

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