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Preparation and Testing of FDCA based Nanocomposites
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH).
2018 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The project focuses on the use of diallyl 2,5-furanedicarboxylate (DAFDC) as a bio-based alternative for phthalic acid based thermosets. Initially, kinetic analysis, by means of Borchardt and Daniels method was performed to study the curing conditions. However, this model gave inaccurate results mainly due to different conditions apparent during Differential Scanning Calorimetry (DSC) measurement which were not able to be simulated in the experimental procedure that was followed. Nevertheless, by curing DAFDC with  of dicumyl peroxide (DCP), which comprise the matrix, and incorporating graphene oxide nanodots (GONDs) and carbon nanotubes (CNTs) in different weight amounts, in a staggered temperature and time fashion, nanocomposites based on DAFDC were produced. GONDs were oxidized from carbon nanospheres (CNs). The latter were produced from cellulose by adding a dialysis step in the protocol found in the literature 2.

Through the characterization of the nanocomposites, it was concluded that the above protocol resulted in partially crosslinked materials which were further cured at elevated temperatures during Dynamical Mechanical Analysis (DMA). The fully crosslinked nanocomposites produced from this heating ramp exhibited enhanced properties. More specifically, the degradation temperature corresponding to  loss of mass, i.e. , seemed to be unaffected by the filler content and compared to the matrix it was enhanced by roughly  and  for GOND-filled and CNT-filled nanocomposites, respectively. Conductivity measurements gave an insight on the percolation threshold of the produced nanocomposites. On the one hand, CNT-filled nanocomposites exhibited a percolation threshold at  of CNT and their conductivity was increasing by increasing filler content. On the other hand, for GOND-filled nanocomposites, the filler content seemed to be lower than this threshold, since no electrical conductivity value could be monitored. The mechanical testing showed indications of enhanced properties of the fully cured nanocomposites compared to their partially cured analogues. However, due to the geometry and breaking of the cured samples during DMA, the mechanical properties could not be verified. Finally, the morphology of the nanocomposites was investigated by means of digital microscopy. Both sides of the samples were studied, since the side that was in contact with oxygen during curing, exhibited different morphological behavior than the side that was not in contact with oxygen. In particular, the side which was in contact with oxygen, showed a smoother surface than the side which was in contact with the mold.

In conclusion, the possibility to produce a bio-based alternative of phthalic acid based thermosets was verified, giving the opportunity to eagerly investigate this monomer in different applications in the future.

Place, publisher, year, edition, pages
2018.
Keywords [en]
thermoset, phthalic acid, Borchardt and Daniels kinetics, nanocomposites, 2, 5-furandicarboxylic acid
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-233549OAI: oai:DiVA.org:kth-233549DiVA, id: diva2:1241508
Available from: 2018-08-23 Created: 2018-08-23 Last updated: 2018-08-23Bibliographically approved

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