مدل‌سازی توزیع اندازه ذرات در سیستم‌های پلیمریزاسیون امولسیونی بوتیل آکریلات و بوتادی‌ان

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشگاه سیستان و بلوچستان، گروه مهندسی شیمی

2 دانشیار گروه مهندسی شیمی/ دانشگاه سیستان و بلوچستان

3 پژوهشگاه پلیمر و پتروشیمی ایران

چکیده

توزیع اندازه ذرات، یکی از مهم‌ترین پارامتر‌های لاتکس‌های تولید شده به روش پلیمریزاسیون امولسیونی است. این پارامتر بر خواص رئولوژیکی، نوری، چسبندگی، تشکیل فیلم و و مقامت مکانیکی لاتکس تاثیر گذرا است. در این راستا، مدل‌سازی توزیع اندازه ذرات در پلیمریزاسیون امولسیونی از نقطه نظر مطالعات مکانیزمی و کاربردی از اهمیت بسزایی برخوردار است. توسعه دینامیکی توزیع اندازه ذرات توسط مجموعه‌ای از معادلات موازنه جمعیت که وقایع متعددی از جمله هسته‌زایی، رشد و انعقاد را در بر می‌گیرد، توصیف می‌شود. حجم تولید بالا و کاربرد گسترده پلی بوتیل‌آکریلات و پلی بوتادین که به روش پلیمریزاسیون امولسیونی تولید می‌شوند، بر اهمیت مدل‌سازی این دو فرآیند در راستای بهبود درک مکانیسمی و تولید محصولات مورد نظر می‌افزاید. در این پژوهش مدلی مکانیزمی بر مبنای معادلات موازنه جمعیت برای پیش‌بینی توزیع اندازه ذرات در پلیمریزاسیون امولسیونی بوتیل‌آکریلات و بوتادی‌ان ارائه شده است و روش حجم محدود برای گسسته‌سازی معادلات موازنه جمعیت مورد استفاده قرار گرفته است. نتایج حاصل از مدل‌سازی این دو فرآیند به منظور بررسی اثر غلظت عامل فعال کننده سطح بر روی تغییرات درصد تبدیل و متوسط قطر ذرات در مقایسه با داده‌های تجربی مورد بررسی قرار گرفته است.

کلیدواژه‌ها


عنوان مقاله [English]

Modeling of Particle Size Distribution in Emulsion Polymerization of Butyl acrylate and Butadiene

چکیده [English]

The particle size distribution (PSD) is one of the most important parameters of emulsion polymerization latexes. This parameter affected the rheological and optical properties, adhesion, film formation and mechanical strength of latexes. Therefore, the modeling of PSD is of utmost importance in terms of application and mechanistic studies. Dynamic evolution of PSD is described by a set of population balance equations which involved various phenomena such as nucleation, growth, and coagulation. The extensive application and especially annually massive production of poly(butylacrylate) and polybutadiene produced by emulsion polymerization, highlights the significant of modeling these processes, which could resulted in better mechanistic knowledge and tailor-made polymer materials. In this paper, a mechanistic model based on population balance equations is developed for butyl acrylate and butadiene emulsion polymerization in a batch reactor. This model is used to predict the evolution of particle size distribution and the finite volume method as a precise technique is used for discritizing PBEs. The simulation results compared with the measured values during the evolution of conversion and average particle diameter for different initial surfactant concentrations.

کلیدواژه‌ها [English]

  • Particle Size Distribution
  • emulsion polymerization
  • butyl acrylate
  • butadiene
  • population balance equations

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