Crystallization and morphological control of calcium carbonate by functionalized triblock copolymers

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• 作者：Yunlan Su ; Hengrui Yang ; Wenxiong Shi ; Hongxia Guo ; Ying Zhao ; Dujin Wang
• 关键词：Calcium carbonate ; Triblock copolymer ; Block length ; Computer simulation
• 刊名：Colloids and Surfaces A: Physicochemical and Engineering Aspects
• 出版年：2010
• 出版时间：20 February 2010
• 年：2010
• 卷：355
• 期：1-3
• 页码：158-162
• 全文大小：771 K

文摘

A systematic investigation on the influence of a series of synthesized triblock copolymers (PEG-b-PAA-b-PS, poly(ethylene glycol)-block-poly(acrylic acid)-block-poly(styrene)) on the crystallization, morphology and size of CaCO₃ crystals was reported. The crystallization of vaterite is favored in the presence of copolymer 1 (PEG₁₁₂-b-PAA₄₀-b-PS₃₇), which strongly depends on the polymer concentration. The fraction of spherical vaterite increased with the increase of the concentrations of copolymer 1. The molecular dynamics minimized structure of copolymer 2 (PEG₁₁₂-b-PAA₁₈-b-PS₅₅) showed a close match between the spacings of the parallel-oriented carboxylate groups and the spacings of calcium ions in the calcite surface, which is favorable to the crystallization of calcite at all determined concentrations. The triblock copolymers could prohibit the phase transformation of vaterite to calcite, depending upon the block length of PAA middle segment and the concentration of the copolymers.