Versatile Diblock Polyampholytes Can Form Two Types of Charged and Internally Structured Core–Shell Particles by Complexation with Cationic or Anionic Surfactants

阳离子聚合 粒子(生态学) 肺表面活性物质 化学工程 小角X射线散射 动态光散射 Zeta电位 聚合物 甲基丙烯酸酯 化学 高分子化学 材料科学 化学物理 散射 纳米颗粒 共聚物 纳米技术 有机化学 光学 工程类 地质学 物理 海洋学
作者
Suelen G. Trindade,Lennart Piculell,Watson Loh
出处
期刊:Langmuir [American Chemical Society]
卷期号:38 (9): 2906-2918 被引量:7
标识
DOI:10.1021/acs.langmuir.1c03322
摘要

We used diblock poly(acrylic acid)-b-poly(2-dimethylamino ethyl methacrylate) (PAA-b-PDMAEMA) polyampholytes to prepare core-shell complexes with ionic surfactants. The dispersions have been characterized by means of small-angle X-ray scattering (SAXS), cryogenic transmission electron microscopy (Cryo-TEM), dynamic light-scattering, and zeta potential methods. Using cationic or anionic surfactants it is possible to produce particles with either positively or negatively charged shells, both having an internal liquid-crystalline core structure. For the different systems, different preparation protocols were found to be successful to produce stable and reproducible particles. The particle morphologies depend on the surfactant used. Complexes with the cationic surfactant hexadecyltrimethylammonium (CTA+) form oblate particles, while complexes with dodecyl sulfate (DS-) form cylindrical rods. In both complexes, the smallest dimension of the core does not exceed twice the block length of the core-forming polymer block. For the particles with CTA+, nonelectrostatic attractive interactions among the PDMAEMA chains in the shells seem to be present, affecting the particle shape. In both types of particles, the surfactant in the core forms rod-like aggregates, arranged in a two-dimensional hexagonal structure with the surfactant rods aligned with the axis of rotational symmetry in the particle. With charged polymer chains in the shell, the aggregates present a striking stability over time, displaying no change in particle size over the time scale investigated (10 months). Nevertheless, the aggregates are highly dynamic in nature, and their shapes and structures can be changed dramatically in dispersion, without intermediate precipitation, by changes in the composition of the medium. Specifically, a transition from aggregates with cationic surfactant to aggregates with anionic surfactant can be achieved.
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