اثر مشخصه‌های عامل هسته‌زا بر ساختار سلولی و خواص مکانیکی بر اسفنج‌های پلی‌اتیلن

نوع مقاله : تالیفی

نویسندگان

1 گروه پلیمر، پژوهشکده مهندسی کامپوزیت، مجتمع دانشگاهی مواد و فناوری ساخت، دانشگاه صنعتی مالک اشتر

2 تهران، دانشگاه صنعتی مالک اشتر، مجتمع دانشگاهی مواد و فناوری‌های ساخت

3 پژوهشکده مهندسی کامپوزیت-مجتمع دانشگاهی مواد و فناریهای ساخت-دانشگاه صنعتی مالک اشتر-تهران-ایران مدیر و هیئت علمی پژوهشکده مهندسی

چکیده

اسفنج‎ های پلی‌اتیلن به­ دلیل خواص منحصر به فردی چون نسبت استحکام به وزن مناسب، عایق گرمایی بسیار عالی، عایق صوتی و خواص مکانیکی خوب، مورد توجه ویژه جوامع علمی و صنعتی قرار گرفته ­اند. یکی از اهداف پژوهش ­های روز دنیا در زمینه اسفنج‌های پلی‌اتیلن، افزایش تراکم سلولی و کاهش اندازه سلول این مواد برای رسیدن به خواص مطلوب است. امروزه، این واقعیت کاملاً مشهود بوده که استفاده از عامل­ های هسته‌زا برای کنترل شکل ­شناسی سلول (یعنی تراکم سلول‎ ها، اندازه سلول و توزیع آن) در اسفنج‌های پلی‌اتیلن کاملاً ضروری است. در مطالعه حاضر، ابتدا دو نظریه هسته‌زایی و مشخصه‌های عامل هسته‌زا از نگاه نظریه‌های هسته‌زایی کلاسیک و میدان خودسازگار به‎ طور کامل بحث شده ­اند که مهم‌ترین و کاربردی­ ترین نظریه‌های هسته‌زایی در اسفنج ‎های پلیمری هستند. در ادامه، مشخصه‌های لازم برای انتخاب عامل هسته‎ زا در اسفنج‌های پلی‌اتیلن معرفی و بررسی شد. براساس بررسی‎ های انجام­ گرفته در این باره مشخص شده است، غلظت بهینه، چگالی انرژی آزاد حجمی و به ­­ویژه کشش سطحی، مهم‎ترین معیار و مشخصه‌های انتخاب عامل هسته‌زا در مقایسه با سایر پارامترها مانند هندسه (1F<، کمترین میزان تأثیر نسبت به دو عامل دیگر) اندازه ذرات، قابلیت پراکندگی و غیره هستند.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Effect of Nucleating Agent Characteristics on Cellular Structure and Mechanical Properties of Polyethylene Foams

نویسندگان [English]

  • mahmoud razavi zadeh 1
  • mohammad hosseini 2
  • Mohammad Reza Pourhosseini 3
  • mohammad khabiry 2
1 Department of Materials Science and Manufacturing Technology, Malek Ashtar University of Technology
2 Department of Materials Science and Manufacturing Technology, Malek Ashtar University of Technology
3 Polymer Departmenr, Composite Research Center, Material and Manufacturing Process Faculty, Malek Ashtar university, Tehran, Iran
چکیده [English]

Due to their unique properties such as proper strength to weight ratio, excellent thermal insulation, sound insulation and good mechanical properties polyethylene foams have received special attention from the scientific and industrial communities. One of the goals of modern research in the field of polyethylene foams is to increase the cell density and reduce the cell size of these materials to achieve the desired properties. Today, it is a well-known fact that the use of nucleating agents is absolutely necessary to control cell morphology (ie, cell density, cell size and distribution) in polyethylene foams. In the present study, first, two theories of nucleation and the characteristics of the nucleating agent have been fully discussed from the point of view of classical nucleation and self-consistent field theories, which are the most important and practical theories of nucleation in polymer foams. Then, the necessary characteristics for the selection of nucleating agent in polyethylene foams were introduced and examined. Based on the investigations carried out in this regard, it has been determined that the optimal concentration, volumetric free energy density, and especially surface tension of the nucleating agent, are the most important criteria and characteristics for the selection of a nucleating agent compared to other parameters such as geometry (F <1, the lowest effect compared to the other two factors) particle size, and dispersibility.

کلیدواژه‌ها [English]

  • polyethylene foam
  • cellular nucleation
  • nucleating agent
  • cell density
  • cell size

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