Hobiger Viola, Paljevac Muzafera, Krajnc Peter
PolyOrgLab, Faculty of Chemistry and Chemical Engineering, University of Maribor, Smetanova 17, 2000 Maribor, Slovenia.
Polymers (Basel). 2022 Mar 25;14(7):1338. doi: 10.3390/polym14071338.
1,6-hexanediol diacrylate (HDDA) or divinyl adipate (DVA) and pentaerythritol tetrakis(3-mercaptopropionate) (TT) were polymerised via a thiol-ene radical initiated photopolymerisation using emulsions with a high volume fraction of internal droplet phase and monomers in the continuous phase as precursors. The porous structure derived from the high internal phase emulsions (HIPEs) followed the precursor emulsion setup resulting in an open porous cellularly structured polymer. Changing the emulsion composition and polymerisation conditions influenced the resulting morphological structure significantly. The investigated factors influencing the polymer monolith morphology were the emulsion phase ratio and surfactant concentration, leading to either interconnected cellular type morphology, bicontinuous porous morphology or a hollow sphere inverted structure of the polymerised monoliths. The samples with interconnected cellular morphology had pore diameters between 4 µm and 10 µm with approx. 1 µm sized interconnecting channels while samples with bicontinuous morphology featured approx. 5 µm wide pores between the polymer domains. The appropriate choice of emulsion composition enabled the preparation of highly porous poly(thiol-enes) with either polyHIPE or bicontinuous morphology. The porosities of the prepared samples followed the emulsion droplet phase share and could reach up to 88%.
1,6 - 己二醇二丙烯酸酯（HDDA）或己二酸二乙烯酯（DVA）与季戊四醇四（3 - 巯基丙酸酯）（TT）通过硫醇 - 烯自由基引发的光聚合反应进行聚合，使用内部液滴相体积分数高的乳液以及连续相中的单体作为前体。源自高内相乳液（HIPE）的多孔结构遵循前体乳液设置，从而形成具有开放多孔细胞结构的聚合物。改变乳液组成和聚合条件会显著影响所得的形态结构。影响聚合物整体形态的研究因素包括乳液相比和表面活性剂浓度，这导致聚合整体呈现出相互连接的细胞型形态、双连续多孔形态或空心球倒置结构。具有相互连接细胞形态的样品的孔径在4微米至10微米之间，带有约1微米大小的互连通道，而具有双连续形态的样品在聚合物域之间具有约5微米宽的孔。乳液组成的适当选择能够制备具有聚HIPE或双连续形态的高度多孔聚（硫醇 - 烯）。所制备样品的孔隙率遵循乳液液滴相比例，可达88%。
