Daniels Grant C, Hinnant Katherine M, Brown Loren C, Weise Nickolaus K, Aukerman Mark C, Giordano Braden C
Chemistry Division, United States Naval Research Laboratory, Washington, D.C. 20375, United States.
ASEE Post-Doctoral Fellow, U.S. Naval Research Laboratory, Washington, D.C. 20375, United States.
Langmuir. 2022 Apr 19;38(15):4547-4554. doi: 10.1021/acs.langmuir.1c02759. Epub 2022 Apr 6.
A series of amphiphilic statistical copolymers involving poly(ethylene glycol) monomethacrylate (PEGMA, -OH terminated, average Mn 200 molecular weight) and various hydrophobic acrylates were synthesized via reversible addition-fragmentation chain transfer (RAFT) polymerization. The gradient copolymers were characterized by gel-permeation chromatography (GPC), H nuclear magnetic resonance (NMR), and attenuated total reflection Fourier transform infrared spectroscopy (FTIR-ATR). Solution properties of the copolymers were investigated utilizing surface tension measurement, dynamic light-scattering (DLS), as well as foam analysis using a dynamic foam analyzer (DFA). The PEG-functionalized copolymers showed a systematic trend depending on the hydrophobic moiety in properties including surface tension, critical micelle concentration (CMC), foam lifetime, and liquid drainage from the foam. Copolymers with alkyl-acrylates exhibited the best foam lifetime, demonstrating that the choice of hydrophobic moiety is crucial for foam stability. The PEG-functionalized materials described are considered promising additives for foam-stability purposes.
通过可逆加成-断裂链转移（RAFT）聚合反应合成了一系列两亲性统计共聚物，这些共聚物包含聚乙二醇单甲基丙烯酸酯（PEGMA，羟基封端，平均分子量Mn 200）和各种疏水性丙烯酸酯。通过凝胶渗透色谱法（GPC）、氢核磁共振（NMR）以及衰减全反射傅里叶变换红外光谱法（FTIR-ATR）对梯度共聚物进行了表征。利用表面张力测量、动态光散射（DLS）以及使用动态泡沫分析仪（DFA）进行泡沫分析，研究了共聚物的溶液性质。PEG功能化共聚物在表面张力、临界胶束浓度（CMC）、泡沫寿命以及泡沫中的液体排出等性质方面，呈现出取决于疏水部分的系统趋势。含烷基丙烯酸酯的共聚物表现出最佳的泡沫寿命，这表明疏水部分的选择对于泡沫稳定性至关重要。所描述的PEG功能化材料被认为是用于泡沫稳定目的的有前景的添加剂。
