SELF-ASSEMBLY NETWORKS OF P(DTAB-co-AM) AND WORMLIKE MICELLES MEDIATED BY HYDROPHOBIC ASSOCIATION AND ELECTROSTATIC INTERACTIONS

ZHANG Xufeng; WU Wenhui

doi:10.3724/SP.J.1105.2009.00879

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SELF-ASSEMBLY NETWORKS OF P(DTAB-co-AM) AND WORMLIKE MICELLES MEDIATED BY HYDROPHOBIC ASSOCIATION AND ELECTROSTATIC INTERACTIONS

Research Article | 更新时间：2021-03-19

- SELF-ASSEMBLY NETWORKS OF P(DTAB-co-AM) AND WORMLIKE MICELLES MEDIATED BY HYDROPHOBIC ASSOCIATION AND ELECTROSTATIC INTERACTIONS
- Acta Polymerica Sinica Issue 9, Pages: 879-885(2009)
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- DOI：10.3724/SP.J.1105.2009.00879
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- Published：20 September 2009，
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ZHANG Xufeng, WU Wenhui. SELF-ASSEMBLY NETWORKS OF P(DTAB-co-AM) AND WORMLIKE MICELLES MEDIATED BY HYDROPHOBIC ASSOCIATION AND ELECTROSTATIC INTERACTIONS. [J]. Acta Polymerica Sinica (9):879-885(2009)
DOI：

ZHANG Xufeng, WU Wenhui. SELF-ASSEMBLY NETWORKS OF P(DTAB-co-AM) AND WORMLIKE MICELLES MEDIATED BY HYDROPHOBIC ASSOCIATION AND ELECTROSTATIC INTERACTIONS. [J]. Acta Polymerica Sinica (9):879-885(2009) DOI： 10.3724/SP.J.1105.2009.00879.

摘要

由新型的阳离子疏水单体二甲基十四烷基（3-丙烯酰胺基丙基）溴化铵（DTAB）与丙烯酰胺（AM）共聚合成了阳离子型疏水缔合共聚物P(DTAB-co-AM)，研究了该共聚物与蠕虫状胶束自组装后的协同增黏效应，及改变疏水单体含量对自组装体系黏度的调控作用.制备了十八烷基三甲基氯化铵（CTAC）/水杨酸钠和芥酸钾/三羟乙基苄基氯化铵两类稳定的黏度较大的蠕虫状胶束体系.共聚物P(DTAB-co-AM)与芥酸钾/三羟乙基苄基氯化铵蠕虫状胶束在疏水缔合和静电吸引双重作用下自组装可形成协同增黏的缔合体系，而与CTAC/水杨酸钠阳离子蠕虫状胶束进行自组装由于只有疏水缔合作用，增黏效果不及前者.表观黏度研究表明，随着疏水单体含量的增加，P(DTAB-co-AM)与芥酸钾/三羟乙基苄基氯化铵缔合体系的黏度先增加后降低，当疏水单体含量为0.15 mol%时，缔合体系黏度达到极大值；当疏水单体含量为0.3 mol%时，缔合体系黏度反而低于与阳离子蠕虫状胶束缔合后的黏度.对于共聚物与CTAC/水杨酸钠蠕虫状胶束缔合体系，随着疏水单体含量增加，由于疏水缔合作用与静电排斥作用的相互抵消，致使体系黏度有所下降.由此说明改变疏水单体含量可以达到调控自组装体系黏度的目的.

Abstract

The synergistic enhanced viscosity of self-assembly networks of wormlike micelles and cationic hydrophobically associative copolymer P(DTAB-co-AM) synthesized by copolymerization of cationic hydrophobic monomer

dimethyltetradecyl(3-acrylamidopropyl)ammoniumbromide (DTAB)

with acrylamide (AM) was studied

and the effect of hydrophobic monomer content on the self-assembly systems was also probed.Two kinds of stable wormlike micelles with high viscosity

Octadecyltrimethyl ammonium chloride CTAC/sodium salicylate and potassium erucate/benzyltrihydroxyethylammonium chloride

were prepared.The copolymer P(DTAB-co-AM) and anionic wormlike micelles

potassium erucate/benzyltrihydroxyethylammonium chloride

could form self-assembly system with synergistic enhanced viscosity because both of hydrophobic association and electrostatic interactions play an important role.But the viscosity enhancement of the associative system composed of the copolymer P(DTAB-co-AM) and cationic wormlike micelles

CTAC/sodium salicylate

was weaker than that of the former because of the single hydrophobic association interaction.The results of the viscosity experiments show the viscosity of the self-assembly system made up of P(DTAB-co-AM) and anionic wormlike micelles first increased

then decreased with the increase of feed content of hydrophobic monomer in copolymer.When the feed content of DTAB in P(DTAB-co-AM) was 0.15 mol%

the viscosity of association system reached the maximum.When the feed content of DTAB was 0.3 mol%

the viscosity of this self-assembly system was lower than that of the system formed by this copolymer and cationic wormlike micelles because of more strong electrostatic interaction leading to phase separation.In contrast

the viscosity of the system self-assembled by this copolymer and cationic wormlike micelles appear a slight decrease with the increase of the DTAB content because hydrophobic association and electrostatic repulsion offset each other.Based on the above discussions

the aim to mediate the viscosity of self-assembly system by the feed content of hydrophobic monomer can be realized.

关键词

疏水缔合协同增黏蠕虫状胶束自组装

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Guangzhou Institute of Chemistry, Chinese Academy of Sciences

聚合物分子工程国家重点实验室复旦大学高分子科学系

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