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Thermal treatment to improve the hydrophobicity of ground CaCO3 particles modified with sodium stearate.

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Title: Thermal treatment to improve the hydrophobicity of ground CaCO3 particles modified with sodium stearate.
Authors: Liang, Yong1, Yu, Keyi1, Zheng, Qinzhong1, Xie, Jiuren1, Wang, Ting-Jie1 wangtj@tsinghua.edu.cn
Source: Applied Surface Science. Apr2018, Vol. 436, p832-838. 7p.
Subjects: Heat treatment, Calcium carbonate, Hydrophobic interactions, Stearates, Surface grafting (Polymer chemistry), Atomic radius
Abstract: The surface modification of calcium carbonate (CaCO 3 ) particles, which is used as a filler, significantly affects the properties of the composed materials. The effects of thermal treatment on ground calcium carbonate (GCC) particles subjected to hydrophobic modification using sodium stearate (RCOONa) were studied. The contact angle of the modified GCC particles increased from 24.7° to 118.9° when the amount of RCOONa added was increased from 0% to 5% and then decreased to 97.5° when the RCOONa content was further increased to 10%. When a large amount of RCOONa was added, RCOO − reacts with Ca 2+ and generates (RCOO) 2 Ca nuclei, which are adsorbed on the surface of the GCC particles, forming a discontinuous (RCOO) 2 Ca modified layer. After thermal treatment under sealed conditions, the contact angle of the GCC particles modified using 1.5% RCOONa/GCC increased from 112.8° to 139.6°. The thermal stability of the (RCOO) 2 Ca modified layer was increased, with the temperature increase of the mass-loss peak from 358.0 to 463.0 °C. It is confirmed that the spreading of melted (RCOO) 2 Ca nuclei on the surface of the GCC particles during the thermal treatment increased the continuity of the modified layer, converting the physical adsorption of the (RCOO) 2 Ca nuclei into chemisorption. The grafting density of RCOO − on the GCC particle surface after thermal treatment approximates to 5.00/nm 2 , which is close to the single-molecular-layer grafting density of RCOO − , indicating that excellent modification was achieved. [ABSTRACT FROM AUTHOR]
Copyright of Applied Surface Science is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 127468368
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Thermal treatment to improve the hydrophobicity of ground CaCO3 particles modified with sodium stearate.
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  Data: <searchLink fieldCode="AR" term="%22Liang%2C+Yong%22">Liang, Yong</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Yu%2C+Keyi%22">Yu, Keyi</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Zheng%2C+Qinzhong%22">Zheng, Qinzhong</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Xie%2C+Jiuren%22">Xie, Jiuren</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Wang%2C+Ting-Jie%22">Wang, Ting-Jie</searchLink><relatesTo>1</relatesTo><i> wangtj@tsinghua.edu.cn</i>
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  Data: <searchLink fieldCode="JN" term="%22Applied+Surface+Science%22">Applied Surface Science</searchLink>. Apr2018, Vol. 436, p832-838. 7p.
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  Data: <searchLink fieldCode="DE" term="%22Heat+treatment%22">Heat treatment</searchLink><br /><searchLink fieldCode="DE" term="%22Calcium+carbonate%22">Calcium carbonate</searchLink><br /><searchLink fieldCode="DE" term="%22Hydrophobic+interactions%22">Hydrophobic interactions</searchLink><br /><searchLink fieldCode="DE" term="%22Stearates%22">Stearates</searchLink><br /><searchLink fieldCode="DE" term="%22Surface+grafting+%28Polymer+chemistry%29%22">Surface grafting (Polymer chemistry)</searchLink><br /><searchLink fieldCode="DE" term="%22Atomic+radius%22">Atomic radius</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: The surface modification of calcium carbonate (CaCO 3 ) particles, which is used as a filler, significantly affects the properties of the composed materials. The effects of thermal treatment on ground calcium carbonate (GCC) particles subjected to hydrophobic modification using sodium stearate (RCOONa) were studied. The contact angle of the modified GCC particles increased from 24.7° to 118.9° when the amount of RCOONa added was increased from 0% to 5% and then decreased to 97.5° when the RCOONa content was further increased to 10%. When a large amount of RCOONa was added, RCOO − reacts with Ca 2+ and generates (RCOO) 2 Ca nuclei, which are adsorbed on the surface of the GCC particles, forming a discontinuous (RCOO) 2 Ca modified layer. After thermal treatment under sealed conditions, the contact angle of the GCC particles modified using 1.5% RCOONa/GCC increased from 112.8° to 139.6°. The thermal stability of the (RCOO) 2 Ca modified layer was increased, with the temperature increase of the mass-loss peak from 358.0 to 463.0 °C. It is confirmed that the spreading of melted (RCOO) 2 Ca nuclei on the surface of the GCC particles during the thermal treatment increased the continuity of the modified layer, converting the physical adsorption of the (RCOO) 2 Ca nuclei into chemisorption. The grafting density of RCOO − on the GCC particle surface after thermal treatment approximates to 5.00/nm 2 , which is close to the single-molecular-layer grafting density of RCOO − , indicating that excellent modification was achieved. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Applied Surface Science is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.apsusc.2017.12.023
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      – Code: eng
        Text: English
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        PageCount: 7
        StartPage: 832
    Subjects:
      – SubjectFull: Heat treatment
        Type: general
      – SubjectFull: Calcium carbonate
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      – SubjectFull: Hydrophobic interactions
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      – SubjectFull: Stearates
        Type: general
      – SubjectFull: Surface grafting (Polymer chemistry)
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      – SubjectFull: Atomic radius
        Type: general
    Titles:
      – TitleFull: Thermal treatment to improve the hydrophobicity of ground CaCO3 particles modified with sodium stearate.
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            NameFull: Liang, Yong
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            NameFull: Yu, Keyi
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            NameFull: Wang, Ting-Jie
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              Text: Apr2018
              Type: published
              Y: 2018
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              Value: 436
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