Graduate School of Engineering, Kobe University, Kobe 657-8501, Japan.
Langmuir. 2010 May 4;26(9):6303-7. doi: 10.1021/la904115s.
Poly(acrylic acid) (PAA) particles were successfully prepared by dispersion polymerization of acrylic acid in ionic liquid, N,N-diethyl-N-methyl-N-(2-methoxyethyl)ammonium bis(trifluoro-methanesulfonyl)amide ([DEME][TFSA]) at 70 degrees C with low hydrolysis grade (35.4%) poly(vinyl alcohol) as stabilizer. Interestingly, the PAA particles were easily extracted as particle state with water. Thus, the PAA particles had a cross-linked structure during the polymerization without cross-linker. Moreover, it was also noted that the cross-linking density of the PAA particles could be controlled by thermal treatment at various temperatures in [DEME][TFSA] utilizing the advantages of nonvolatility and high thermal stability of the ionic liquid.
聚丙烯酸（PAA）粒子通过在 70°C 下，在离子液体 N,N-二乙基-N-甲基-N-(2-甲氧基乙基)铵双(三氟甲磺酰基)酰胺([DEME][TFSA])中，使用低水解度（35.4%）的聚乙烯醇作为稳定剂，对丙烯酸进行分散聚合成功制备。有趣的是，PAA 粒子可以很容易地用水提取出来，呈粒子状态。因此，PAA 粒子在聚合过程中无需交联剂即可形成交联结构。此外，还注意到可以利用离子液体的不挥发性和高热稳定性的优点，在[DEME][TFSA]中，通过在不同温度下进行热处理，来控制 PAA 粒子的交联密度。
