Chemical Degradation of Amine-cured DGEBA Epoxy Resin in Supercritical 1-Propanol for Recycling Carbon Fiber from Composites

Hua Yan; Chun-xiang Lu; De-qi Jing; Xiang-lin Hou

doi:10.1007/s10118-014-1519-5

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Chemical Degradation of Amine-cured DGEBA Epoxy Resin in Supercritical 1-Propanol for Recycling Carbon Fiber from Composites

Updated：2021-06-21

- Chemical Degradation of Amine-cured DGEBA Epoxy Resin in Supercritical 1-Propanol for Recycling Carbon Fiber from Composites
- Chinese Journal of Polymer Science Vol. 32, Issue 11, Pages: 1550-1563(2014)
- Affiliations：
  
  a.National Engineering Laboratory for Carbon Fiber Technology, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
  b.University of Chinese Academy of Sciences, Beijing 100049, China
  c.State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
- Author bio：
  
  **Chun-xiang Lu (吕春祥), E-mail: Chunxl@sxicc.ac.cn
- Funds：
- DOI：10.1007/s10118-014-1519-5
  CLC：
- Received：24 January 2014，
  
  Revised：2014-03-22，
  
  Accepted：25 March 2014，
  
  Published：2014-11
- Accepted：
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Hua Yan, Chun-xiang Lu, De-qi Jing, et al. Chemical Degradation of Amine-cured DGEBA Epoxy Resin in Supercritical 1-Propanol for Recycling Carbon Fiber from Composites[J]. Chinese Journal of Polymer Science, 2014, 32(11): 1550-1563.
DOI：

Hua Yan, Chun-xiang Lu, De-qi Jing, et al. Chemical Degradation of Amine-cured DGEBA Epoxy Resin in Supercritical 1-Propanol for Recycling Carbon Fiber from Composites[J]. Chinese Journal of Polymer Science, 2014, 32(11): 1550-1563. DOI： 10.1007/s10118-014-1519-5.

摘要

Abstract

Chemical degradation of diglycidyl ether of bisphenol A (DGEBA) epoxy resin cured with an aliphatic amine in supercritical 1-propanol was investigated under different reaction temperature and time. The combination of GC-MS and LC-MS proved that the epoxy resin was decomposed to five main products including phenol

4-isopropylphenol

4-isopropenylphenol

bisphenol A

and 4

4′-(cyclopropane-1

1-diyl)diphenol. The

C-NMR results verified the chemical structures of the degradation products. The change of the products' yield with time was evaluated by an effective means of HPLC. In addition

the GPC analysis confirmed the formation of soluble low molecular weight clusters during the degradation reaction. A possible free-radical reaction mechanism was proposed for chemical depolymerization of the epoxy resin in supercritical 1-propanol. After the homolytic cleavage of the aromatic ether linkages

the resulting bisphenol A biradical either produced 4

4′-(cyclopropane-1

1-diyl)diphenol after intramolecular rearrangement or generated bisphenol A after capturing hydrogen from 1-propanol.

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