چقرمه‌سازی پلیمر زیست‌تخریب‌پذیر PLA به‌وسیله آمیخته‌سازی با EVA

نوع مقاله : تالیفی

نویسندگان

دانشگاه صنعتی قم

چکیده

در سال­های اخیر، استفاده گسترده از مواد پلیمری، به علت آلایندگی زیست­محیطی آن­ها مورد توجه قرار گرفته است. برای حل این مشکل، توسعه مواد پلیمری زیست­تخریب­پذیر جدید برای جایگزینی پلاستیکها و لاستیک­های بر پایه نفت پیشنهاد شده است. پلی­لاکتیک اسید (PLA) از شناخته­ترین پلیمرهای زیست­تخریب­پذیر است که دارای مزایایی چون تولید از منابع زیستی، شفافیت عالی و مقاومت و سختی زیاد است. با این حال، شکنندگی ذاتی PLA، مشکل عمده­ای است که استفاده گسترده از آن را در کاربردهای نیازمند تغییر شکل پلاستیک در سطوح تنش زیاد محدود کرده است. از موثرترین روش­ها برای غلبه بر این مشکل، آمیخته­سازی PLA با پلیمرهای چقرمه است. از پلیمرهای چقرمه دارای رفتار لاستیکی که امروزه برای اصلاح شکنندگی و بهبود مقاومت ضربه­ای گرمانرم­ها استفاده می­شود، کوپلیمر اتیلن وینیل استات (EVA) است. در این مقاله، چقرمه­سازی پلیمر PLA از راه آمیخته­سازی با EVA بررسی شده است. استفاده از روش پخت دینامیکی فاز EVA و افزودن نانوذرات برای بهبود سازگاری در سطح مشترک این دو پلیمر و همچنین افزایش ضربه­پذیری و چقرمگی مرور شده است.

کلیدواژه‌ها


عنوان مقاله [English]

Toughening of Poly(lactic acid) (PLA) through blending with Ethylene-co-Vinyl Acetate (EVA) Copolymer

نویسندگان [English]

  • Pardis Lohrasbi
  • Jafar Khademzadeh Yeganeh
Qom University of Technology
چکیده [English]

The widespread use of traditional petroleum based plastic and rubber has received considerable attention in recent years due to their environmental pollution. To solve this problem, the development of new biodegradable polymer materials has been proposed to replace petroleum-based plastics and rubbers. Poly(lactic acid) (PLA) is one of the most well-known biodegradable polymers that has advantages such as such as high strength and stiffness, being bio-based and excellent transparency. However, the inherent brittleness of PLA, is a major problem that has limited its widespread use in applications requiring plastic deformation at high stress levels. One of the most effective methods to overcome this problem is blending of PLA with tough polymers. Ethylene vinyl acetate (EVA) copolymer is a tough elastomeric polymer that used to modify ductility and improve the impact strength of thermoplastics. In this paper, the toughening of PLA by blending with EVA is investigated. The use of dynamic vulcanization of EVA phase method and the addition of nanoparticles to improve the compatibility at the interface of the two polymers as well as to increase the impact strength and toughness have been reviewed.

کلیدواژه‌ها [English]

  • poly(lactic acid)
  • impact strength
  • ethylene-co-vinyl acetate
  • dynamic vulcanization
  • nanoparticles
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