A proposal for enhanced microstructural development of Poly(ethylene 2,5-furandicarboxylate), PEF, upon stretching: On strain-induced crystallization and amorphous phase stability improvement

Poly(ethylene 2,5-furandicarboxylate), PEF, has been described regarding its ability at developing strain-induced crystallization (SIC). The influence of several stretching settings on its microstructural development has been investigated. Based on the time/temperature superposition principle, the stretching settings have been chosen to draw the material in its rubbery-like state. Two equivalent strain rates, defined at the reference temperature of 100 ?, have been selected. For each equivalent strain rate, two strain rate/temperature couples ( "slow " and "rapid ") are selected. It appears that the strain rates ( "slow " or "rapid ") have an influence on the induced microstructure in terms of crystal perfection, amorphous phase rigidity and thermal stability. Depending on the strain rate, the presence (for "rapid " tests) or the absence (for "slow " tests) of self-heating upon stretching is reported. Indeed, it could be the key point to determine the final definition of the crystal obtained. Additionally, the amorphous domain mobility is impacted: the stability of the amorphous domain with temperature has been increased with the use of "rapid " conditions. SIC occurs for all the stretching settings applied but the use of couples with rapid strain rates/high temperatures could be more efficient to improve the microstructure definition and stability: these results are of prime interest regarding industrial applications such as ISBM (Injection Stretch Blow Moulding) or thermoforming.