Abstract Due to intermediate hydrophobicity of methyl methacrylate (MMA) monomer in water, it is difficult to prepare its stable water in oil high internal phase emulsion (HIPE). Moreover, the addition of fully hydrophilic co-monomer such as 2-hydroxyethyl methacrylate (HEMA) in MMA monomer makes it further troublesome to stabilize these emulsions. This paper addresses the preparation of such type of difficult to prepare emulsions via addition of an amphiphilic fluorinated di-block copolymer (FDB), poly(2-dimethylamino)ethylmethacrylate-b-poly(trifluoroethyl methacrylate) (PDMAEMA-b-PTFEMA) as stabilizer. Interestingly, HEMA and/or HFBA (hexa fluorobutyl acrylate) as co-monomers were successfully added to impart some special properties such as thermodynamic stability, desired amphiphilicity to the final polyHIPEs. Fluorinated blocks in FDB anchored well at oil/water interface of HIPE, offering enough hydrophobicity to the comparatively hydrophilic monomers and in turn providing resistance against coalescence. MMA polyHIPEs were found to be fully hydrophobic just by replacing HEMA co-monomer with HFBA. Due to superb inherent hydrophobic nature of fluorine atoms, MMA-HFBA polyHIPEs showed remarkable water contact angle of 139°. Furthermore, the addition of fluorinated co-monomer in MMA based HIPEs significantly improved thermal stabilities of these materials with improvement in degradation temperature from 305 °C to 360 °C.

中文翻译：

---

双嵌段共聚物稳定的甲基丙烯酸甲酯基聚 HIPE：亲水和疏水共聚单体对形态、润湿性和热性能的影响

摘要 由于甲基丙烯酸甲酯（MMA）单体在水中具有中等疏水性，难以制备其稳定的油包水高内相乳液（HIPE）。此外，在 MMA 单体中加入完全亲水的共聚单体，如甲基丙烯酸 2-羟乙酯 (HEMA)，使得稳定这些乳液变得更加困难。本文讨论了通过添加两亲性氟化双嵌段共聚物 (FDB)、聚（2-二甲氨基）甲基丙烯酸乙酯-b-聚（甲基丙烯酸三氟乙酯）（PDMAEMA-b-PTFEMA）来制备此类难以制备的乳液。稳定剂。有趣的是，HEMA 和/或 HFBA（丙烯酸六氟丁酯）作为共聚单体被成功添加，以赋予最终的聚 HIPE 一些特殊性能，如热力学稳定性、所需的两亲性。FDB 中的氟化嵌段很好地锚定在 HIPE 的油/水界面，为相对亲水的单体提供足够的疏水性，进而提供抗聚结能力。仅通过用 HFBA 代替 HEMA 共聚单体，发现 MMA 聚 HIPE 是完全疏水的。由于氟原子极好的固有疏水性，MMA-HFBA polyHIPEs 显示出显着的水接触角 139°。此外，在基于 MMA 的 HIPE 中添加氟化共聚单体显着提高了这些材料的热稳定性，降解温度从 305°C 提高到 360°C。仅通过用 HFBA 代替 HEMA 共聚单体，发现 MMA 聚 HIPE 是完全疏水的。由于氟原子极好的固有疏水性，MMA-HFBA polyHIPEs 显示出显着的水接触角 139°。此外，在基于 MMA 的 HIPE 中添加氟化共聚单体显着提高了这些材料的热稳定性，降解温度从 305°C 提高到 360°C。仅通过用 HFBA 代替 HEMA 共聚单体，发现 MMA 聚 HIPE 是完全疏水的。由于氟原子极好的固有疏水性，MMA-HFBA polyHIPEs 显示出显着的水接触角 139°。此外，在基于 MMA 的 HIPE 中添加氟化共聚单体显着提高了这些材料的热稳定性，降解温度从 305°C 提高到 360°C。