Structural Insights into LDPE/UHMWPE Blends Processed by γ-Irradiation

Abstract

Ultra-high-molecular-weight polyethylene (UHMWPE) matrices containing low-density polyethylene (LDPE), hydroxyapatite (HAp) as filler, and rosemary extract (RM) as stabilizer were investigated for their qualification for long-term applications. The significant contributions of the blend components were analyzed, and variations in mechanical properties, oxidation strength, thermal behavior, crystallinity, and wettability were discussed. SEM images of microstructural peculiarities completed the introspective survey. The stability improvement due to the presence of both additives was an increase in the total degradation period of 67% in comparison with an unmodified HDPE/UHMWPE blend when the materials were subjected to a 50 kGy γ-dose. There was growth in activation energies from 121 kJ mol−1 to 139 kJ mol−1 when HAp and rosemary extract delayed oxidation. The exposure of samples to the action of γ-rays was found to be a proper procedure for accomplishing accelerated oxidative degradation. The presence of rosemary extract and HAp powder significantly increased the thermal and oxidation resistances. The calculation of material lifetimes at various temperatures provided meaningful information on the wearability and integrity of the inspected composites.

Fractional order ATR-FTIR differential spectroscopy for detection of weak bands and assessing the radiation modifications in gamma sterilized UHMWPE

“…The radiation induced oxidation reactions results in increase in absorption of carbonyl C = O species, and this is reflected from the % decrease of transmittance from 1650 cm −1 to 1850 cm −1 for irradiated samples i.e. P-25 and P-50 (see Fig 2(B) )[ 15 – 18 ]…”

Feasibility of Repairing Concrete with Ultra-High Molecular Weight Polyethylene Fiber Cloth: A Comprehensive Literature Review

“…With the help of the above-mentioned strengthening techniques, UHMWPE can be developed into a strong potential FRP composite for strengthening and repairing concrete materials. In summary, these modification techniques aim to utilize active electrons or ions to break the covalent bonds on the UHMWPE surface, such as C-C and C-H bonds, to generate more free radicals [118], reduce chemical inertness, and achieve better interlocking with the matrix, as shown in Figure 6b. With the help of the above-mentioned strengthening techniques, UHMWPE can be developed into a strong potential FRP composite for strengthening and repairing concrete materials.…”

Impact of natural antioxidant (silybin) on the thermal stability of Ultra High Molecular Weight Polyethylene: A Thermogravimetric Study

“…These applications are possible only due to its excellent wear resistance, impact resistance and biocompatibility [5][6][7][8][9]. In spite of these excellent inherent properties, UHMWPE cannot be considered as potential candidate at higher temperature applications due to its low thermal stability [10][11][12]. For this, adequate thermal stabilizer can be introduced in UHMWPE matrix.…”