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A novel strategy to simultaneously electrochemically prepare and functionalize graphene with a multifunctional flame retardant.

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Title: A novel strategy to simultaneously electrochemically prepare and functionalize graphene with a multifunctional flame retardant.
Authors: Cai, Wei1, Feng, Xiaming1, Wang, Bibo1, Hu, Weizhao1, Yuan, Bihe2, Hong, Ningning1 hnn@ustc.edu.cn, Hu, Yuan1 yuanhu@ustc.edu.cn
Source: Chemical Engineering Journal. May2017, Vol. 316, p514-524. 11p.
Subjects: Fireproofing agents, Graphene, Polyphosphazenes, Polyurethanes, Heat release rates
Abstract: The essence of this work lies in the large-scale production of high-quality graphene sheets and simultaneous functionalization with new electrochemical route. A multifunctional flame retardant with phosphazene rings is well designed to simultaneously exfoliate and functionalize graphene. Due to the antioxidant function of flame retardant, the electrochemically-exfoliated graphene sheets exhibit high quality and low defect (C/O = 10.4). Furthermore, the obtained graphene is noncovalently modified to form flame retardant functionalized graphene sheets (FGNS). Subsequently, the FGNS is applied to improve fire safety and mechanical performance of thermoplastic polyurethane (TPU). Compared to pure sample, the peak heat release rate and total heat release of TPU composites with the addition of 4 wt% FGNS are significantly decreased by 46.3% and 20.2%, respectively. The elongation at break and tensile strength of TPU are enhanced by 11.6% and 59.9%, respectively, with the addition of 2.0 wt% FGNS. The significant enhancement in fire safety is due to conjunct effects of FGNS and the flame retardant. Lower defect of graphene provides more stable layer structure, thus FGNS plays a remarkable barrier action to confine the escape of degradation products. The coated flame retardant is conducive to form compact and robust char residue by reacting with degradation products. In addition, the flame retardant facilitates the load transfer to the robust graphene sheets with improved interface interaction. Through an electrochemical route, designing a multifunctional flame retardant to simultaneously exfoliate and modify graphene provides new possibility for the industrialized application of graphene. [ABSTRACT FROM AUTHOR]
Copyright of Chemical Engineering Journal 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: 121618629
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Label: Title
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  Data: A novel strategy to simultaneously electrochemically prepare and functionalize graphene with a multifunctional flame retardant.
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  Data: <searchLink fieldCode="AR" term="%22Cai%2C+Wei%22">Cai, Wei</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Feng%2C+Xiaming%22">Feng, Xiaming</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Wang%2C+Bibo%22">Wang, Bibo</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Hu%2C+Weizhao%22">Hu, Weizhao</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Yuan%2C+Bihe%22">Yuan, Bihe</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Hong%2C+Ningning%22">Hong, Ningning</searchLink><relatesTo>1</relatesTo><i> hnn@ustc.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Hu%2C+Yuan%22">Hu, Yuan</searchLink><relatesTo>1</relatesTo><i> yuanhu@ustc.edu.cn</i>
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  Data: <searchLink fieldCode="JN" term="%22Chemical+Engineering+Journal%22">Chemical Engineering Journal</searchLink>. May2017, Vol. 316, p514-524. 11p.
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  Data: <searchLink fieldCode="DE" term="%22Fireproofing+agents%22">Fireproofing agents</searchLink><br /><searchLink fieldCode="DE" term="%22Graphene%22">Graphene</searchLink><br /><searchLink fieldCode="DE" term="%22Polyphosphazenes%22">Polyphosphazenes</searchLink><br /><searchLink fieldCode="DE" term="%22Polyurethanes%22">Polyurethanes</searchLink><br /><searchLink fieldCode="DE" term="%22Heat+release+rates%22">Heat release rates</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: The essence of this work lies in the large-scale production of high-quality graphene sheets and simultaneous functionalization with new electrochemical route. A multifunctional flame retardant with phosphazene rings is well designed to simultaneously exfoliate and functionalize graphene. Due to the antioxidant function of flame retardant, the electrochemically-exfoliated graphene sheets exhibit high quality and low defect (C/O = 10.4). Furthermore, the obtained graphene is noncovalently modified to form flame retardant functionalized graphene sheets (FGNS). Subsequently, the FGNS is applied to improve fire safety and mechanical performance of thermoplastic polyurethane (TPU). Compared to pure sample, the peak heat release rate and total heat release of TPU composites with the addition of 4 wt% FGNS are significantly decreased by 46.3% and 20.2%, respectively. The elongation at break and tensile strength of TPU are enhanced by 11.6% and 59.9%, respectively, with the addition of 2.0 wt% FGNS. The significant enhancement in fire safety is due to conjunct effects of FGNS and the flame retardant. Lower defect of graphene provides more stable layer structure, thus FGNS plays a remarkable barrier action to confine the escape of degradation products. The coated flame retardant is conducive to form compact and robust char residue by reacting with degradation products. In addition, the flame retardant facilitates the load transfer to the robust graphene sheets with improved interface interaction. Through an electrochemical route, designing a multifunctional flame retardant to simultaneously exfoliate and modify graphene provides new possibility for the industrialized application of graphene. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Chemical Engineering Journal 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.cej.2017.01.017
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        Text: English
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        PageCount: 11
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        Type: general
      – SubjectFull: Graphene
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      – SubjectFull: Polyphosphazenes
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      – SubjectFull: Polyurethanes
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      – SubjectFull: Heat release rates
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      – TitleFull: A novel strategy to simultaneously electrochemically prepare and functionalize graphene with a multifunctional flame retardant.
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              Text: May2017
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              Value: 316
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