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The synthesis of spherical calcium carbonate composite in amphiphilic PS-b-PAA solution and its thermal dynamic characteristic

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Chinese Science Bulletin

Abstract

Spherical calcium carbonate composite is synthesized in the solution of amphiphilic block copolymer of polystyrene(PS) and poly(acrylic acid)(PAA). SEM and XRD measurements show that the diameter of the particulates decreases with the augment of the PS-b-PAA concentration, crystalline in the composite is calcite and its morphology as well as the structure is changed too. TG-DTA together with IR analysis is applied to investigating the thermal dynamic behavior of the composite. The results show that the composite is mainly composed of two phases, that is, the nano-crystalline calcium carbonate and the PS-b-PA-Ca composites. PS phase decomposes first with a large heat release at about 330 °C. However, the PAA chains have relatively high thermal stability, probably due to the structural Ca-O bond, and decomposes at above 400 °C. Matching opinions are used to explain the possible reasons for the regular as well as the particular characteristics of the composite corresponding to a certain copolymer concentration.

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Authors and Affiliations

  1. Department of Chemistry, Zhejiang University, 310027, Hangzhou, China

    Linhai Yue & Dalai Jin

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  1. Linhai Yue
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  2. Dalai Jin
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Correspondence to Linhai Yue.

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Yue, L., Jin, D. The synthesis of spherical calcium carbonate composite in amphiphilic PS-b-PAA solution and its thermal dynamic characteristic. Chin.Sci.Bull. 49, 235–239 (2004). https://doi.org/10.1007/BF03182804

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  • DOI: https://doi.org/10.1007/BF03182804

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