物理化学学报 >> 2009, Vol. 25 >> Issue (09): 1806-1810.doi: 10.3866/PKU.WHXB20090832

研究论文 上一篇    下一篇

聚酰胺-胺接枝PPO-PEO两亲嵌段树状分子的合成与表面性质

杨惠, 杨世伟, 吴旭, 周继柱, 王金本   

  1. 哈尔滨工程大学材料科学与化学工程学院, 哈尔滨 150001|中国科学院化学研究所, 胶体、界面与化学热力学院重点实验室, 北京 100190
  • 收稿日期:2009-04-02 修回日期:2009-06-01 发布日期:2009-09-03
  • 通讯作者: 王金本 E-mail:jbwang@iccas.ac.cn

Syntheses and Surface Properties of a Novel Series of Polyamidoamine Branched with PPO-PEO Dendrimers

YANG Hui, YANG Shi-Wei, WU Xu, ZHOU Ji-Zhu, WANG Jin-Ben   

  1. College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, P. R. China|Key Laboratory of Colloid, Interface and Chemical Thermodynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
  • Received:2009-04-02 Revised:2009-06-01 Published:2009-09-03
  • Contact: WANG Jin-Ben E-mail:jbwang@iccas.ac.cn

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摘要：

合成了一系列以1.0 代(G1)聚酰胺-胺(PAMAM)为核心、以聚环氧丙烷-聚环氧乙烷(PPO-PEO)为辐射臂的新型树状分子, 通过傅里叶变换红外(FTIR)光谱、质谱(MS)、核磁共振谱(1H NMR)和凝胶渗透色谱(GPC)等方法对其结构进行了表征与分析. 用表面张力与稳态荧光法对其表面性质与聚集行为进行研究, 结果表明, 临界聚集浓度(CAC)随PPO-PEO两亲嵌段长度的增加而增大, 同时聚集体的生成对芘探针有增溶作用, 并使其微环境的极性明显减弱. 通过动态激光光散射(DLS)法得到聚集体的尺寸分布均为窄分布, 其平均尺寸约为100 nm. 对该体系水溶液pH效应的研究发现, 两亲嵌段的长度对于质子化进程有着较大影响.

关键词: 树状分子, 聚酰胺-胺, 表面性质, 聚集行为, pH效应

Abstract:

Dendrimers composed of G1 (generation 1.0) polyamidoamine (PAMAM) and branched with poly(propylene oxide) (PPO)-poly(ethylene oxide) (PEO) were synthesized. The dendrimer series was characterized using Fourier transform infrared (FTIR) spectrometry, mass spectrometry (MS), 1H nuclear magnetic resonance (NMR), and gel permeation chromatography (GPC). Results fromsurface tension and steady fluorescence measurements showed that the critical aggregation concentration (CAC) increased with longer PPO-PEO chains, while the microenvironment of solubilized pyrene became weakly polar. The size distribution of aggregates was examined using the dynamic light scattering (DLS) method, which indicated a narrow distribution and an average hydrodynamic radius (Rh) of around 100 nm. The effect of pH on this system was also investigated and showed that the length of amphiphilic branches played a large role in the protonation process.

Key words: Dendrimer, PAMAM, Surface property, Aggregation behavior, pH effect