Aging behavior and lifetime modeling for polycarbonate

Evolution of the mechanical properties and estimation of the useful lifespan of poly(lactic acid) based compounds

“…On the other hand, the activation energy E a of PLAcryst was calculated using the equation of the endurance plot (Eq. (1)) . E a calculated by loss in the tensile strength of PLAcryst is 8.3 kJ mol −1 , a value which is very close to those obtained for PLAblend, suggesting that the stability of the mechanical properties of these PLA based compounds is far lower than other conventional engineering thermoplastics .…”

“…Finally, the activation energy ( E a ) of PLAblend was calculated using the equation of the endurance plot: …”

“…E a of PLAblend is 13 kJ mol −1 and 8.4 kJ mol −1 for tensile strength and strain at break, respectively. This indicates that the stability of the mechanical properties of these PLA based compounds is far lower than other conventional engineering thermoplastics such as polycarbonate (229 − 272 kJ mol −1 ) or polyamide (77 kJ mol −1 ) . Rasselet et al reported that PLA can suffer chain scission under thermo‐oxidative conditions at temperatures from 70 °C to the melting temperature and that the effect of hydrolysis can be neglected in those conditions .…”

Evaluation of recycling of polycarbonate sheets used in ballistic glass packages

“…Therefore, the procedure used to remove this PC sheet from the ballistic package is being very detrimental to the polymer, and is provoking accelerated aging. In fact, a reduction of the deformation at rupture of more than 50 % can be used as a criterion to decide if a polymer was submitted to accelerated aging [6,7]. Indeed, acetone can provoke a brittle to ductile transition on PC samples [8].…”

Aging effect in the adhesion of a PC/CPVC arrangement for application in thermo-solar collectors

“…Aging of polymeric materials which are potential candidates for applications in solar absorbers has been the subject of several studies, in terms of the effect of physical, chemical, and mechanical aging. [5][6][7] In a recent report, the aging behavior of several amorphous and semicrystalline polymers was studied under conditions of exposure to hot water (80°C, up to 16,000 h) and hot air (140°C, up to 500 h), relating the changes observed in the mechanical properties under tension, where the main aging mechanisms observed were physical and chemical. [6] Studies dealing with the effects of irradiation on polymers have been an important area of research; irradiation on polymers can modify their structure and properties due to molecular chain rupture, which can be reflected, in some cases, through a change in color and mechanical properties.…”