This article informs the essence of major work done by a number of researchers on the analysis of two-step curing mechanism of diglycidyl ether of bisphenol A (DGEBA) epoxy resin in presence of amine curing agents using near-and mid-IR technology. Various peaks used as a marker for resin formation are discussed and their implementation is comprehensively studied. In addition to this, a wide range of information about the importance of reference peaks in both near-IR (NIR) and mid-IR (MIR) regions are congregated and their accuracy is audited. Also discrepancies observed by researchers in epoxy conversion (α) in NIR and MIR regions are reviewed to highlight the comparative advantages of both regions, one over the other.
Electronic waste
(e-waste) plastics from end-of-life printers,
predominantly polycarbonate, were upcycled and transformed into sustainable
3D printing filaments. Results from mechanical testing indicate that
the e-waste plastics filaments and its 3D prints exhibit up to 76
and 83% of breaking and tensile strength respectively of its virgin
counterparts produced from a widely used plastic for 3D printing,
i.e., ABS. The 3D prints from e-waste plastic were more flexible compared
to those from virgin plastics. SEM analysis of the fractured surface
of the 3D prints post tensile testing is also presented in the paper.
Furthermore, LCA studies on our filament production process indicate
28% reduction in CO2 emissions while using e-waste plastics
as feedstock as compared to virgin plastics. Effects of repeated recycling,
up to four extrusion cycles, on the virgin and e-waste plastic filaments
were studied, and a comprehensive semiquantitative degradation mechanism
for the same was proposed using results from 13C NMR and
TGA analysis.
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