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Preparation and Characterization of Carborane Modified Liquid Fluoroelastomers and the investigation of their properties.

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Title: Preparation and Characterization of Carborane Modified Liquid Fluoroelastomers and the investigation of their properties.
Authors: Li, Juan1 (AUTHOR) julialijuan@163.com
Source: Designed Monomers & Polymers. Dec2021, Vol. 24 Issue 1, p184-192. 9p.
Subjects: Fluoroelastomers, Liquids, Tensile strength, Thermogravimetry, Coordination polymers, Organic solvents, Rubber
Abstract: The preparation of liquid fluoroelastomers that are liquid with excellent mechanical properties remains a challenge. Here, we show a very straightforward method to produce liquid fluoroelastomers by introducing carborane. Carborane-terminated liquid fluoropolymer was synthesized by Steglich reaction of carboxyl-terminated liquid fluoropolymer and 1,7-bis (hydroxy)-carborane. The product is brown, viscous at room temperature and in the semi-solid state. On this basis, HDI Trimer was used as a curing agent to cure liquid fluoroelastomer. Thermogravimetric analysis of the cured products was carried out. The carbon residue rate of the cured product increased from 35% to 58% of the cured product. The results show that the addition of carborane structure can effectively improve the carbon residue rate of liquid fluoroelastomer. The tensile strength, elongation and shore hardness of the cured product were also examined, and the results show that the tensile strength of carborane modified liquid fluorine increased by 463% compared with that before modification, but the elongation at break was reduced by 42%, which was mainly due to the introduction of rigid structure of carborane. At the same time, the solvent resistance test results show that the introduction of carborane structure has little effect on the aviation kerosene resistance and organic solvent resistance of fluororubber, but it can improve its alkali resistance. [ABSTRACT FROM AUTHOR]
Copyright of Designed Monomers & Polymers is the property of Taylor & Francis Ltd 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.)
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DbLabel: Engineering Source
An: 154225011
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  Label: Title
  Group: Ti
  Data: Preparation and Characterization of Carborane Modified Liquid Fluoroelastomers and the investigation of their properties.
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  Label: Authors
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  Data: <searchLink fieldCode="AR" term="%22Li%2C+Juan%22">Li, Juan</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> julialijuan@163.com</i>
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  Data: <searchLink fieldCode="JN" term="%22Designed+Monomers+%26+Polymers%22">Designed Monomers & Polymers</searchLink>. Dec2021, Vol. 24 Issue 1, p184-192. 9p.
– Name: Subject
  Label: Subjects
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  Data: <searchLink fieldCode="DE" term="%22Fluoroelastomers%22">Fluoroelastomers</searchLink><br /><searchLink fieldCode="DE" term="%22Liquids%22">Liquids</searchLink><br /><searchLink fieldCode="DE" term="%22Tensile+strength%22">Tensile strength</searchLink><br /><searchLink fieldCode="DE" term="%22Thermogravimetry%22">Thermogravimetry</searchLink><br /><searchLink fieldCode="DE" term="%22Coordination+polymers%22">Coordination polymers</searchLink><br /><searchLink fieldCode="DE" term="%22Organic+solvents%22">Organic solvents</searchLink><br /><searchLink fieldCode="DE" term="%22Rubber%22">Rubber</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The preparation of liquid fluoroelastomers that are liquid with excellent mechanical properties remains a challenge. Here, we show a very straightforward method to produce liquid fluoroelastomers by introducing carborane. Carborane-terminated liquid fluoropolymer was synthesized by Steglich reaction of carboxyl-terminated liquid fluoropolymer and 1,7-bis (hydroxy)-carborane. The product is brown, viscous at room temperature and in the semi-solid state. On this basis, HDI Trimer was used as a curing agent to cure liquid fluoroelastomer. Thermogravimetric analysis of the cured products was carried out. The carbon residue rate of the cured product increased from 35% to 58% of the cured product. The results show that the addition of carborane structure can effectively improve the carbon residue rate of liquid fluoroelastomer. The tensile strength, elongation and shore hardness of the cured product were also examined, and the results show that the tensile strength of carborane modified liquid fluorine increased by 463% compared with that before modification, but the elongation at break was reduced by 42%, which was mainly due to the introduction of rigid structure of carborane. At the same time, the solvent resistance test results show that the introduction of carborane structure has little effect on the aviation kerosene resistance and organic solvent resistance of fluororubber, but it can improve its alkali resistance. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Designed Monomers & Polymers is the property of Taylor & Francis Ltd 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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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1080/15685551.2021.1935014
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 9
        StartPage: 184
    Subjects:
      – SubjectFull: Fluoroelastomers
        Type: general
      – SubjectFull: Liquids
        Type: general
      – SubjectFull: Tensile strength
        Type: general
      – SubjectFull: Thermogravimetry
        Type: general
      – SubjectFull: Coordination polymers
        Type: general
      – SubjectFull: Organic solvents
        Type: general
      – SubjectFull: Rubber
        Type: general
    Titles:
      – TitleFull: Preparation and Characterization of Carborane Modified Liquid Fluoroelastomers and the investigation of their properties.
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            – D: 01
              M: 12
              Text: Dec2021
              Type: published
              Y: 2021
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              Value: 24
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            – TitleFull: Designed Monomers & Polymers
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