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

引用本文: 陈贻建, 刘腾, 翟雪如, 徐桂英. 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[J]. 物理化学学报, 2014, 30(1): 102-110. doi: 10.3866/PKU.WHXB201311071 shu

Citation: CHEN Yi-Jian, LIU Teng, ZHAI Xue-Ru, XU Gui-Ying. Comparative Study on the Aggregation Behaviors of X-Shaped and Linear Block Polyethers at the Air/Water and n-Heptane/Water Interfaces[J]. Acta Physico-Chimica Sinica, 2014, 30(1): 102-110. doi: 10.3866/PKU.WHXB201311071 shu

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

基金项目:
国家自然科学基金(20573067，20873077) (20573067，20873077)

国家科技重大专项(2011ZX05024-004-08)资助项目 (2011ZX05024-004-08)

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:

English

Comparative Study on the Aggregation Behaviors of X-Shaped and Linear Block Polyethers at the Air/Water and n-Heptane/Water Interfaces

1.
Key Laboratory of Colloid and Interface Chemistry, Ministry of Education, Shandong University, Jinan 250100, P. R. China
Received Date: 11 July 2013
Available Online: 01 January 2014
Fund Project:
国家自然科学基金(20573067，20873077)

国家科技重大专项(2011ZX05024-004-08)资助项目

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-heptane/water interfaces were systematically studied. The results show that LPE is more efficient at decreasing 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 that at the air/water surface, implying that immersion of the PO groups in the oil phase is more energetically favorable than immersion in the air phase. The oil molecules can insert into the adsorption layer, and hydrophobic interactions between oil molecules and PO moieties lead to a relatively ordered arrangement of adsorbed polyether molecules. At the n-heptane/water interface, diffusion of the block polyethers is faster than that at the air/water surface. The dilatational elasticity at the n-heptane/water interface is much higher than that at the air/water surface.

Key words:

X-shaped block polyether
/ Interfacial activity
/ Interfacial dilational viscoelasticity
/ Interfacial aggregation behavior

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

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

English

Comparative Study on the Aggregation Behaviors of X-Shaped and Linear Block Polyethers at the Air/Water and n-Heptane/Water Interfaces

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南：你的皮肤可能是一片SPMs

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CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

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

English

Comparative Study on the Aggregation Behaviors of X-Shaped and Linear Block Polyethers at the Air/Water and n-Heptane/Water Interfaces

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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通讯作者: 陈斌, bchen63@163.com

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