اصلاح چقرمگی رزین‌های اپوکسی با استفاده از پلی‌یورتان‌ها: مطالعه‌ مروری

نوع مقاله: تالیفی

نویسندگان

پژوهشگاه پلیمر و پتروشیمی ایران

چکیده

پلیمرهای گرماسخت به‌دلیل برخورداری از پیوندهای عرضی در ساختار شیمیایی، ویژگی‌های بسیار مطلوبی، مانند استحکام مکانیکی زیاد، پایداری ابعادی بسیار مناسب در دماهای زیاد، خزش اندک و مقاومت مناسب در برابر حلال‌ها نشان می‌دهند. به‌منظور دستیابی به ویژگی‌های گرمامکانیکی مطلوب، لازم است درصد بیشتری از پیوندهای عرضی در رزین ایجاد شود. رزین اپوکسی از رزین‌های پرمصرفی است که به‌دلیل داشتن خواص مکانیکی و ویژگی‌های برجسته، در کاربردهای زیادی مانند پوشش‌ها، چسب‌ها و کامپوزیت‌ها استفاده می‌شود. اما، این رزین‌ها پس از پخت کاهش مقاومت ضربه‌ای و رشد ترک نشان می‌دهند. بدین سبب در سال‌های اخیر، پژوهش‌های فراوانی به‌منظور بهبود چقرمگی رزین اپوکسی انجام یافته است. اصلاح شیمیایی رزین‌های اپوکسی با پلی‌یورتان‌ها از مهم‌ترین روش‌های بهبود چقرمگی محسوب می‌شود. از جمله خواص منحصربه‌فرد پلی‌یورتان‌ها می‌توان به ویژگی‌های ضدسایش عالی، فرایندپذیری ساده و استحکام زیاد در برابر پارگی اشاره کرد. در این مقاله، پس از معرفی اجمالی رزین‌های اپوکسی و پلی‌یورتان‌ها‌، روش‌ها و سازوکار‌های بهبود چقرمگی شکست رزین اپوکسی با استفاده از پلی‌یورتان مرور می‌شود.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Toughening Modification of Epoxy Resins Using Polyurethanes: A Review

نویسندگان [English]

  • Hossein Abdollahi
  • Ali Salimi
  • Mehdi Barikani
  • Hamed Daemi
چکیده [English]

Thermoset polymers have excellent properties of high dimensional stability at elevated temperatures, low creep and good resistance against solvents due to their three-dimensional crosslinking structure. Proper thermal-mechanical properties for these polymers are based on such cured structures with high crosslink density. Due to its excellent mechanical properties, epoxy resin has been widely used in coatings, adhesives and composites. In recent years, a variety of modification procedures have been introduced for toughening of cured resin structure in order to minimize crack formation and improve their impact resistance. Chemical modification of epoxy resins with polyurethanes is one of the most efficient procedures to achieve this goal. Polyurethanes have unique properties including good abrasion resistance, ease of processing and high rupture strength. After a brief introduction of epoxy and polyurethane resins, the procedures and the mechanisms of fracture toughness in polyurethane-modified epoxy are reviewed in present article. Different polyurethanes with wide range of chemical structures are able to toughen the epoxy structure efficiently and provide improved resins for use indifferent applications.

کلیدواژه‌ها [English]

  • epoxy resin
  • polyurethane
  • mechanical properties
  • fracture toughness
  • chemical modification
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