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具有可控两亲性的双向共响应聚合物颗粒。

Two-Way CO-Responsive Polymer Particles with Controllable Amphiphilic Properties.

作者信息

Shieh Yeong-Tarng, Yeh Yao-Chuan, Cheng Chih-Chia

机构信息

Department of Chemical and Materials Engineering, National University of Kaohsiung, 700 Kaohsiung University Road, Nanzih District, Kaohsiung 81148, Taiwan.

Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, 43, Keelung Road, Section 4, Da'an District, Taipei 10607, Taiwan.

出版信息

ACS Omega. 2020 Jan 22;5(4):1862-1869. doi: 10.1021/acsomega.9b03319. eCollection 2020 Feb 4.

DOI:10.1021/acsomega.9b03319
PMID:32039322
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7003192/
Abstract

Multiple stimuli-responsive amphiphilic block copolymers of poly(methacrylic acid) (PMAA) and poly(2-dimethylaminoethyl methacrylate) (PDMAEMA) were used as emulsifiers to prepare two-way CO stimuli-responsive poly(methyl methacrylate) (PMMA) latex particles via aqueous emulsion polymerization. The polymerization at pH 2 and 50 °C produced mainly PDMAEMA-surfaced PMMA latex particles, whereas the polymerization at pH 12 and 50 °C produced mainly PMAA-surfaced particles. Both types of latex particles appeared to precipitate at higher pH values from the emulsifier of a longer PDMAEMA block length. The direction from precipitation to dispersion for PDMAEMA-surfaced particles or from dispersion to precipitation for PMAA-surfaced particles in response to CO bubbling of the pH 12 dispersion of particles depended on the PDMAEMA block length. Together, this study reveals that-by tuning the PDMAEMA block length in PMAA--PDMAEMA used as an emulsifier and polymerization at pH 2 or 12-PMMA latex particles can exhibit two-way CO responsiveness between dispersion and precipitation. Thus, due to their simple preparation and unique dual pH and CO responsiveness, these newly developed PMAA--PDMAEMA emulsifiers provide a highly efficient approach for the development of smart PMMA latex nanoparticles with desirable multifunctional properties.

摘要

以聚甲基丙烯酸（PMAA）和聚甲基丙烯酸2-二甲氨基乙酯（PDMAEMA）的多种刺激响应性两亲嵌段共聚物为乳化剂，通过水乳液聚合制备了具有双向CO刺激响应性的聚甲基丙烯酸甲酯（PMMA）胶乳颗粒。在pH值为2和50℃下进行聚合，主要生成以PDMAEMA为表面的PMMA胶乳颗粒，而在pH值为12和50℃下进行聚合，主要生成以PMAA为表面的颗粒。两种类型的胶乳颗粒在较高pH值下似乎都会从PDMAEMA嵌段长度较长的乳化剂中沉淀出来。对于以PDMAEMA为表面的颗粒，从沉淀到分散的方向，或者对于以PMAA为表面的颗粒，在pH值为12的颗粒分散液中通入CO时从分散到沉淀的方向，取决于PDMAEMA嵌段长度。总之，本研究表明，通过调节用作乳化剂的PMAA-PDMAEMA中PDMAEMA嵌段长度，并在pH值为2或12下进行聚合，PMMA胶乳颗粒可以在分散和沉淀之间表现出双向CO响应性。因此，由于其制备简单以及独特的双pH值和CO响应性，这些新开发的PMAA-PDMAEMA乳化剂为开发具有理想多功能特性的智能PMMA胶乳纳米颗粒提供了一种高效方法。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c7f4/7003192/9e1b4e4c4e9c/ao9b03319_0002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c7f4/7003192/1501cfcfc9fd/ao9b03319_0001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c7f4/7003192/7accffcfd1b6/ao9b03319_0007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c7f4/7003192/e388df1ebf8e/ao9b03319_0006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c7f4/7003192/fb7bfbc51849/ao9b03319_0005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c7f4/7003192/35b15e1158b6/ao9b03319_0004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c7f4/7003192/2ed46db07fc4/ao9b03319_0003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c7f4/7003192/9e1b4e4c4e9c/ao9b03319_0002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c7f4/7003192/1501cfcfc9fd/ao9b03319_0001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c7f4/7003192/7accffcfd1b6/ao9b03319_0007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c7f4/7003192/e388df1ebf8e/ao9b03319_0006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c7f4/7003192/fb7bfbc51849/ao9b03319_0005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c7f4/7003192/35b15e1158b6/ao9b03319_0004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c7f4/7003192/2ed46db07fc4/ao9b03319_0003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c7f4/7003192/9e1b4e4c4e9c/ao9b03319_0002.jpg

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