سنتز و عامل‌دارکردن کوپلیمرهای شانه‌ای آلفااولفین (6 و 10 کربنی)-مالئیک انیدرید و کاربرد آن‌ها در نانوهیبرید سیلیکا و هیدروژل

نوع مقاله : پژوهشی

نویسندگان

تهران، پژوهشگاه پلیمر و پتروشیمی ایران، پژوهشکده مهندسی، گروه مهندسی پلیمریزاسیون، صندوق پستی 112- 14975

چکیده

فرضیه: پلی‌آلفااولفین‌های ساختارهای غیرقطبی دارند و ایجاد قطبیت با عاملیت‌های مختلف موجب توسعه کاربردهای آن‌ها می‌شود. ساختار، تعداد و اندازه شاخه‌ها در زنجیر اصلی بر خواص و طراحی درشت‌مولکول‌های جدید اثر می‌گذارد. وجود گروه‌های واکنش‌پذیر در زنجیرهای آلفااولفینی موجب بهبود برهم‌کنش آن‌ها با نانوذرات سیلیکا می‌شود. همچنین، مقدار شبکه‌ای‌کننده موجب تغییر خاصیت جذب حلال‌های هیدروکربنی می‌شود.
روش‌ها: کوپلیمرشدن رادیکالی 1-هگزن و 1-دکن با مالئیک انیدرید در شرایط مختلف انجام شد. ساختار و خواص گرمایی کوپلیمرهای شانه‌ای آلفااولفین (6 و 10 کربنی)-مالئیک انیدرید با تعداد و اندازه شاخه‌های مختلف با آزمون‌های طیف‌سنجی زیرقرمز تبدیل فوریه (FTIR)، رزونانس مغناطیسی هسته هیدروژن (1HNMR) سوانگاری ژل تراوشی (GPC) و گرماوزن‌سنجی (TGA/DTGA) بررسی شد. اثر مونومرهای عامل‌دار 2-اتیل‌هگزیل آکریلات (2-EHA) و 3-کلرو-2-متیل‌پروپن (3-C2MP) نیز بر واکنش کوپلیمرشدن مطالعه شد. واکنش پلیمرشدن استیرن، مالئیک انیدرید و 1-هگزن در مجاورت نانوذرات سیلیکا انجام شد. هیدروژل‌های جدید با پلی1-هگزن-مالئیک انیدرید استری‌شده با 2-دکانول تهیه شدند. مراحل سنتز نانوهیبرید و هیدروژل و خواص گرمایی آن‌ها با روش‌های FTIR و TGA/DTGA‌ بررسی شد.  
یافته‌ها: انواع کوپلیمرهای شانه‌ای عامل‌دار مالئیک انیدرید با 1-هگزن و 1-دکن با ساختارهای مولکولی متفاوت سنتز و شناسایی شدند. نتایج نشان داد، درصد تبدیل واکنش با افزایش اندازه شاخه آلفااولفین از 4 به 8 کربن، کاهش می‌یابد و کومونومر شاخه‌ای 2-EHA موجب افزایش درصد تبدیل می‌شود. در نانوکامپوزیت به‌دست‌آمده،‌ میان مونومر مالئیک انیدرید و نانوذرات سیلیکا برهم‌کنش وجود دارد. نانوکامپوزیت‌های استیرن-1-هگزن-مالئیک انیدرید دارای 4 و %6/5 وزنی نانوسیلیکا نیز سنتز شدند. طراحی ساختاری شامل عاملیت‌ها و اندازه شاخه‌ها و نیز شرایط واکنش اثر زیادی بر خواص درشت‌مولکول‌ها و هیدروژل سنتزی دارد.

کلیدواژه‌ها

عنوان مقاله [English]

Synthesis and Functionalization of α-Olefines (6 and 10 Carbons)/Maleic Anhydride Comb-like Copolymers and Their Application in Silica Nanohybrid and Hydrogel

نویسندگان [English]

  • Mohammad Reza Rostami Darounkola
  • Hossein Bouhendi
  • Mehrdad Seifali Abbas-Abadi
  • Seyed Mohammad Mehdi Mortazavi
  • Saeid Ahmadjo
Department of Polymerization Engineering, Faculty of Petrochemical, Iran Polymer and Petrochemical Institute, P.O. Box: 14975-112, Tehran, Iran
چکیده [English]

Hypothesis: Poly(α-olefins) have non-polar structures and the development of polarity with different functionalities expands their application. The structure, number and size of the branches of the main chain affect the properties and design of new macromolecules. Active groups in α-olefin chains improve their interaction with silica nanoparticles. Furthermore, the amount of crosslinking changes the adsorption properties of hydrocarbon solvents.
Methods: The free radical copolymerization of 1-hexene and 1-decene with maleic anhydride was performed under different conditions. The structure and thermal properties of α-olefin (6 and 10 carbon) -maleic anhydride comb-like copolymers with different numbers and sizes of branches were investigated by Fourier-transform infrared spectroscopy (FTIR), proton nuclear magnetic resonance (1H NMR), gel permeation chromatography (GPC) and thermogravimetric and differential thermal analysis (TGA/DTGA) methods. The effect of functionalized monomers of 2-ethylhexyl acrylate (2-EHA) and 3-chloro-2-methylpropene (3-C2MP) on the copolymerization reaction and their final structure was investigated. Polymerization reactions of styrene, maleic anhydride and 1-hexene were performed in the presence of silica nanoparticles. New hydrogels were synthesized with esterified poly1-hexene/ maleic anhydride with 2-decanol. The steps of nanohybrid and hydrogel synthesis and their thermal properties were characterized by FTIR and TGA/DTGA methods.
Findings: Various functionalized 1-hexane and 1-decen/ maleic anhydride comb-like copolymers with different molecular structures were synthesized and characterized. The results showed that by increasing the branch size of α-olefin from 4 to 8 carbons, the reaction conversion percent decreases and the branched of 2-EHA comonomer increases the reaction conversion. In the obtained nanocomposite, there is an interaction between maleic anhydride monomer and silica nanoparticles. Styrene/1-hexene/maleic anhydride nanocomposites containing 4 and 5.6% by weight of nanosilica were also synthesized. Structural design including functionalities and branch size, and also reaction conditions have a great influence on the properties of synthesized macromolecules and hydrogels.

کلیدواژه‌ها [English]

  • α-olefine
  • functionalization
  • comb-like copolymer
  • silica nanohybrid
  • hydrogel

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مجله علوم و تکنولوژی پلیمر
دوره 33، شماره 6 - شماره پیاپی 170
بهمن و اسفند 1399
صفحه 537-551

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