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

TY - JOUR

T1 - Synthesis of amphiphilic triblock copolymers and application for morphology control of calcium carbonate crystals

AU - Yang, Hengrui

AU - Su, Yunlan

AU - Zhu, Haijin

AU - Zhu, Hui

AU - Xie, Baoquan

AU - Zhao, Ying

AU - Chen, Yongming

AU - Wang, Dujin

N1 - Funding Information: This work was supported by the National Natural Science Foundation of China (20471064).

PY - 2007/7/13

Y1 - 2007/7/13

N2 - 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.

AB - 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.

KW - Amphiphilic triblock copolymer

KW - Atom-transfer radical polymerization (ATRP)

KW - Calcium carbonate

UR - http://www.scopus.com/inward/record.url?scp=34347402600&partnerID=8YFLogxK

U2 - 10.1016/j.polymer.2007.05.073

DO - 10.1016/j.polymer.2007.05.073

M3 - 文章

AN - SCOPUS:34347402600

SN - 0032-3861

VL - 48

SP - 4344

EP - 4351

JO - Polymer

JF - Polymer

IS - 15

ER -