Burcu KEKEVİ, Emine Hilal MERT, Funda ÇİRA

Yüksek İç Fazlı Emülsiyon Kalıplama ile Metakrilat Esaslı Küresel Polimerlerin Hazırlanması

Epoksi fonksiyonel gruplara sahip gözenekli polimer küreleri, glisidil metakrilat (GMA) ile esnek gruplara sahip 1,3-bütandiol dimetakrilat (BDDMA) karışımından oluşan monomer bileşimi içinde sulu iç faz çözeltisinin dağıtılması ile elde edilen öncü konsantre emülsiyon kalıpları kullanılarak sentezlendi. Bu amaçla, sulu pullulan çözeltilerinin iç faz olarak kullanılması ile GMA ve BDDMA’nın yüksek iç fazlı emülsiyonları (high internal phase emulsions, HIPEs) hazırlandı. Polimerleştirme adımı, öncü HIPE’lerin sekonder bir sulu ortamda dağıtılması ile elde edilen su/yağ/su (w/o/w) sistemleri içerisinde gerçekleştirildi. Öncü emülsiyon kalıplarının hazırlanmasında farklı konsantrasyonlardaki pullulan çözeltileri iç faz olarak kullanılarak, her bir bağımsız polimer fazın veya ağın kendi özelliklerini koruduğu ve birbirleri ile sinerjik bir etkileşim içinde olduğu yarı-geçişimli bir polimerik ağ yapısı elde edildi. Elde edilen polimer (poliHIPE) kürelerinin morfolojik özellikleri mikroskobik görüntüleme teknikleri ile incelendi. Spesifik yüzey alanları ise elde edilen kürelerin N2 adsorpsiyon/desorpsiyon izotermlerine Brunauer–Emmett–Teller (BET) denklemi uygulanarak hesaplandı.

Preparation of Methacrylate Based Spherical Polymers via High Internal Phase Emulsion Templating

Epoxy functional spherical polymer beads were synthesized by using precursor concentrated emulsions templates obtained by dispersing aqueous internal phase solution in the monomer mixture composed of glycidyl methacrylate (GMA) and 1,3-butandiol dimethacrylate having flexible groups. For this purpose, high internal phase emulsions (HIPEs) of GMA and BDDMA were obtained with the use of aqueous pullulan solutions as the internal phase. Polymerization step was achieved within the water/oil/water (w/o/w) systems that were prepared by dispersing precursor HIPEs in a secondary aqueous medium. On the other hand, by using aqueous pullulan solutions during the preparation of precursor emulsion templates, a semi-interpenetrating polymer network structure in which each individual phase or network retains their individual properties and causes synergistic interaction, was obtained. The morphological properties of the resulting polymer (polyHIPE) beads were investigated by using microscopic imaging techniques. The specific surface areas were calculated by applying Brunauer–Emmett–Teller (BET) equation to the N2 adsorption/desertion isotherms of the resulting beads.

Keywords:

Emulsion templating, High internal phase emulsion, polyHIPE beads,

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