Aging behavior and mechanism of bio‐based engineering polyester elastomer nanocomposites

Abstract

Bio-based elastomers used in industry have attracted much attention. We prepared bio-based engineering polyester elastomer (BEE) nanocomposites by mixing bio-based engineering polyester elastomers with carbon (CB). The CB/BEE nanocomposites were exposed to an artificial weathering environment for different time periods. Both its aging behavior changes and aging mechanism were investigated in this article. The tensile strength retention rates were each above 90% after aging at 100 C and 125 C for 72 h. CB/BEE nanocomposites exhibited good anti-aging properties. Furthermore, the chemical changes were detected by Fourier transform infrared spectroscopy and differential scanning calorimetry. The crosslink density changes during aging of BEE were determined as well. A plausible aging mechanism of BEE was proposed. It can be concluded that the thermal oxidation process gives priority to further crosslinking in the initial period of aging. As the aging time increases, chain scission becomes the dominant element in the subsequent thermal oxidation process.

Controlled biodegradation of polymers using nanoparticles and its application

“…Biotic system include microbes, enzyme or combination of both which perform biological activity for their growth employing polymers as carbon source. Fang et al [42] prepared bio-based anti-aging polyester elastomer (BEE) nanocomposites using carbon blend (CB) to investigate its aging behavior and mechanism through tensile testing and glass transition temperature at different temperature showing initial crosslinking phenomena followed by the domination of chain session at the later stage. Therefore, bioreactors are designed in such manners that mimic the environmental conditions during degradation.…”

Improving the interfacial properties of carbon fibers/vinyl ester composites by vinyl functionalization on the carbon fiber surface

“…9 Carbon bers without surface modication present highly stable, non-polar and smooth graphitic surface which makes it difficult to provide ideal interfacial bonding strength with resin matrix. 10,11 Thus, extensive researches have been devoted to the surface treatment of CF in order to improve interfacial properties of CF-reinforced composites, such as sizing process, 12 electrochemical method, 13 plasma treatment, 14,15 oxidation, 16 coating, 17 graing. 18 Ma et al functionalized carbon bers with branched polyethyleneimine as a coupling agent by supercritical methods to improving the interfacial properties of carbon ber-reinforced epoxy composites.…”

Analysis of O-Ring Seal Failure under Static Conditions and Determination of End-of-Lifetime Criterion

“…EPDM stuck especially strongly, so that often considerably high force had to be used and some parts even ripped off the material and clung to the flange, see Figure 14. The reason for this is the relatively large degree of chain scissions occurring during aging of EPDM [16] that make the material sticky [34], e.g., through the formation of oxygen containing polar groups.…”