X型和线型嵌段聚醚在空气水和正庚烷水界面上聚集行为的比较研究.pdfVIP

物理化学学报(Wuli Huaxue Xuebao) 102 Acta Phys. -Chim. Sin. 2014, 30 (1), 102-110 January [Article] doi: 10.3866/PKU.WHXB201311071 X 型与线型嵌段聚醚在空气/水和正庚烷/水界面上 聚集行为的比较研究 陈贻建 刘 腾 翟雪如 徐桂英* ( 山东大学胶体与界面化学教育部重点实验室, 济南250100) 摘要: 通过阴离子聚合方法合成了环氧乙烷(EO)含量和分子量均相同的线型聚氧丙烯(PEO)-聚氧乙烯 (PPO) (LPE)和X 型聚氧丙烯-聚氧乙烯(TPE)嵌段聚醚, 考察了它们在空气/水及正庚烷/水界面上聚集行为的 差异. 界面活性的研究结果表明, TPE 降低水、正庚烷界面张力的效率和效能均低于LPE 的. 聚醚分子在正庚 烷/水界面达到吸附平衡的时间比在空气/水表面短. 由于正庚烷分子插入到聚醚吸附层中, 聚醚分子可以在正 庚烷/水界面上采取更为直立的状态, 因此聚醚分子在正庚烷/水界面扩散较快. 聚醚在正庚烷/水界面的扩张弹 性高于空气/水表面的. 关键词: X 型嵌段聚醚; 界面活性; 界面扩张粘弹性; 界面聚集行为 中图分类号: O641 Comparative Study on the Aggregation Behaviors of X-Shaped and Linear Block Polyethers at the Air/Water and n-Heptane/Water Interfaces CHEN Yi-Jian LIU Teng ZHAI Xue-Ru XU Gui-Ying* (Key Laboratory of Colloid and Interface Chemistry, Ministry of Education, Shandong University, Jinan 250100, P. R. China) Abstract: Linear block polyethers, i.e., poly(ethylene oxide) (PEO)- poly(propylene oxide) (PPO)- PEO (LPE), and X-shaped block polyethers, i.e., PEO-PPO-PEO (TPE), with same EO/PO ratios and molecular masses were synthesized by anionic polymerization. The aggregation behaviors at air/water and n- hep- tane/water interfaces were systematically studied. The results show that LPE is more efficient at decreas- ing the surface tension of water and n-heptane than TPE is. The dynamic interfacial tension curves indicate that the lag-time of the adsorption of the block polyethers at the n-heptane/water interface is smaller than