On-Demand Tailoring between Brittle and Ductile of Poly(methyl methacrylate) (PMMA) via High Temperature Stretching

Abstract

Dog-bone shaped poly(methyl methacrylate) (PMMA) samples were pre-stretched at different temperatures (within the glass transition range and slightly above) to different strains. Subsequently, these pre-stretched samples were aged at 40 °C for up to three months, and finally, all samples were uniaxially stretched to fracture. The Young’s modulus, ultimate stress and toughness of the samples were obtained and plotted as a function of the temperature, and strain in pre-stretching in the contour format. The influence of aging was revealed when the contours of different aging times were compared. One of the most interesting findings was that the toughness of this PMMA can be tailored via controlling the temperature and strain in pre-stretching. The toughness of the pre-stretched samples ranged from 1.317 MJ/m3 to 23.281 MJ/m3 (without aging) and from 1.476 MJ/m3 to 27.532 MJ/m3 (after three months of aging). Based on the results of a series of additional experiments, a mechanism was proposed to reveal the fundaments behind the influence of the temperature and strain in pre-stretching and aging.

PMMA stability under hydrothermal conditions

“…As expected, unprocessed PMMA did not show a fusion peak due to its amorphous nature [31]. The same characteristic is observed for the PMMA solids treated at the lowest temperature without varying the pH (120− 6).…”

In Silico Contact Pressure of Metal-on-Metal Total Hip Implant with Different Materials Subjected to Gait Loading

“…On the contrary, Ti6Al4V-on-Ti6Al4V has the lowest contact pressure value compared to other bearings, but the longest contact radius at about 4.7 mm. It is strongly influenced by Young's modulus that gives it a different material hardness affecting the characteristics of the contact [37], where the value of Young's modulus has a linear relationship with the contact pressure, but is inversely proportional to the contact radius.…”

Patterned Colouring via Variable-Speed Single Stretching

“…Photoelasticity is a traditional technique to reveal the internal stress field in transparent polymers [7,8]. In the course of the current study, the samples to be tested were placed between a computer monitor, which served as the source of polarised light, and a polarised lens.…”