Synthesis of amphiphilic triblock copolymers and application for morphology control of calcium carbonate crystals

共聚物 高分子化学 丙烯酸酯 球霰石 材料科学 凝胶渗透色谱法 原子转移自由基聚合 乙二醇 结晶 聚合 化学 碳酸钙 有机化学 聚合物 复合材料 文石
作者
Hengrui Yang,Yunlan Su,Haijin Zhu,Hui Zhu,Baoquan Xie,Ying Zhao,Yongming Chen,Dujin Wang
出处
期刊:Polymer [Elsevier BV]
卷期号:48 (15): 4344-4351 被引量:17
标识
DOI:10.1016/j.polymer.2007.05.073
摘要

A series of amphiphilic triblock copolymers poly(ethylene glycol)-block-poly(acrylic acid)-block-poly(n-butyl acrylate) (PEG-b-PAA-b-PnBA) differing only in the relative block lengths were synthesized by the acid-catalyzed elimination of the tert-butyl groups from poly(ethylene glycol)-block-poly(tert-butyl acrylate)-block-poly(n-butyl acrylate) (PEG-b-PtBA-b-PnBA), which was synthesized by atom-transfer radical polymerization (ATRP). The degree of polymerization, molecular weight and percentage of hydrolysis of the product PEG-b-PAA-b-PnBA were studied by gel permeation chromatography (GPC), NMR and matrix-assisted laser desorption/ionization time-of-flight mass spectroscopy (MALDI-TOF-MS). Dynamic light scattering (DLS) and transmission electron microscopy (TEM) were used to study the aggregation states of copolymers in water solution. The radii of the copolymer micelles shrink as Ca2+ is introduced into the solutions. The crystallization behaviors of calcium carbonate controlled by copolymer 1 (PEG112-b-PAA86-b-PnBA60) and copolymer 2 (PEG112-b-PAA40-b-PnBA72) differing mainly in the length of PAA block were systematically studied. It was found that the crystallization products are composed of calcite and vaterite, and the ratio of vaterite to calcite increases with increasing the concentration of copolymer 1. For copolymer 2, however, only calcite is obtained at all the concentration range investigated in this work.
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