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Monday, 23 September 2019
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Raw materials & technologies, Technologies

Enhancing the crosslink density and strength of epoxy resin

Thursday, 7 January 2016

Researchers synthesised diamine-functionalised graphene oxide, DDS–GO and HMDA–GO, by introducing 4,4′-diaminodiphenyl sulfone (DDS) or hexamethylenediamine (HMDA) into the carboxylic acid groups on graphene oxide (GO) via amide bonds.

When 1.0 wt% of DDS–GO was added to the EP/DDS mixture, the crosslink density (CD) increased. Source: Klicker/pixelio.de

When 1.0 wt% of DDS–GO was added to the EP/DDS mixture, the crosslink density (CD) increased. Source: Klicker/pixelio.de

The introduction of diamines was confirmed by analytical methods such as FT-IR, TG-DTA, XPS, AFM, and optical microscopy.

Glass transition temperature and tensile strength improved

Then, they applied DDS–GO and HMDA–GO as co-curing agents for epoxy (EP) nanocomposites that were prepared by mixing bisphenol-A type EP and DDS curing agent (ca. 21 wt%). Interestingly, when 1.0 wt% of DDS–GO was added to the EP/DDS mixture, the crosslink density (CD) increased from 0.028 to 0.069 mol cm−3. Due to the higher CD, both the glass transition temperature and tensile strength of the EP/DDS/DDS–GO nanocomposite effectively improved from 160.7 °C to 183.4 °C and from 87.4 MPa to 110.3 MPa, respectively.

The study is published in: Polymer Chemistry, Issue 1, 2016.

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