Next Article in Journal
Effects of Bromination-Dehydrobromination on the Microstructure of Isotropic Pitch Precursors for Carbon Fibers
Next Article in Special Issue
Comparing the Influence of Residual Stress on Composite Materials Made of Polyhydroxybutyrate (PHB) and Amorphous Hydrogenated Carbon (a-C:H) Layers: Differences Caused by Single Side and Full Substrate Film Attachment during Plasma Coating
Previous Article in Journal
Personalised 3D Printed Fast-Dissolving Tablets for Managing Hypertensive Crisis: In-Vitro/In-Vivo Studies
Previous Article in Special Issue
On the Use of Biobased Waxes to Tune Thermal and Mechanical Properties of Polyhydroxyalkanoates–Bran Biocomposites
 
 
Article

Adenine as Epoxy Resin Hardener for Sustainable Composites Production with Recycled Carbon Fibers and Cellulosic Fibers

1
Department of Industrial Chemistry “Toso Montanari” and INSTM UdR-Bologna, University of Bologna, Viale Risorgimento 4, 40136 Bologna, Italy
2
Interdepartmental Center for Industrial Research on Advanced Applications in Mechanical Engineering and Materials Technology, CIRI-MAM, University of Bologna, Viale Risorgimento 2, 40136 Bologna, Italy
*
Author to whom correspondence should be addressed.
Polymers 2020, 12(12), 3054; https://doi.org/10.3390/polym12123054
Received: 1 December 2020 / Revised: 16 December 2020 / Accepted: 17 December 2020 / Published: 20 December 2020
(This article belongs to the Special Issue Polymers from Renewable Sources and Their Mechanical Reinforcement)
In this work, Adenine is proposed, for the first time, as a cross-linker for epoxy resins. Adenine is an amino-substituted purine with heterocyclic aromatic structure showing both proton donors, and hydrogen bonding ability. DSC studies show that adenine is able to positively cross-link a biobased DGEBA-like commercial epoxy precursor with good thermal performance and a reaction mechanism based on a 1H NMR investigation has been proposed. The use of such a formulation to produce composite with recycled short carbon fibers (and virgin ones for the sake of comparison), as well as jute and linen natural fibers as sustainable reinforcements, leads to materials with high compaction and fiber content. The curing cycle was optimized for both carbon fiber and natural fiber reinforced materials, with the aim to achieve the better final properties. All composites produced display good thermal and mechanical properties with glass transition in the range of HT resins (Tg > 150 °C, E’ =26 GPa) for the carbon fiber-based composites. The natural fiber-based composites display slightly lower performance that is nonetheless good compared with standard composite performance (Tg about 115–120 °C, E’ = 7–9 GPa). The present results thus pave the way to the application of adenine as hardener system for composites production. View Full-Text
Keywords: adenine; epoxy resins; biobased hardener; recycled carbon fibers; jute fibers; flax fibers; FRP; composite; sustainability adenine; epoxy resins; biobased hardener; recycled carbon fibers; jute fibers; flax fibers; FRP; composite; sustainability
Show Figures

Figure 1

MDPI and ACS Style

Merighi, S.; Mazzocchetti, L.; Benelli, T.; Giorgini, L. Adenine as Epoxy Resin Hardener for Sustainable Composites Production with Recycled Carbon Fibers and Cellulosic Fibers. Polymers 2020, 12, 3054. https://doi.org/10.3390/polym12123054

AMA Style

Merighi S, Mazzocchetti L, Benelli T, Giorgini L. Adenine as Epoxy Resin Hardener for Sustainable Composites Production with Recycled Carbon Fibers and Cellulosic Fibers. Polymers. 2020; 12(12):3054. https://doi.org/10.3390/polym12123054

Chicago/Turabian Style

Merighi, Stefano, Laura Mazzocchetti, Tiziana Benelli, and Loris Giorgini. 2020. "Adenine as Epoxy Resin Hardener for Sustainable Composites Production with Recycled Carbon Fibers and Cellulosic Fibers" Polymers 12, no. 12: 3054. https://doi.org/10.3390/polym12123054

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop