An Investigation on UHMWPE-HAp Composites Manufactured by Solution-Gelation Method

Abstract

In this study, HAp reinforcement into UHMWPE matrix having 1.0 % wt. mass and its effects on microstructural and mechanical properties of the UHMWPE composites were investigated. UHMWPE composites reinforced with 0.5, 1 and 2.0 wt. % nano HAp powders, respectively were successfully produced by solution and gelation method. SEM studies showed that HAP nano particles were homogenously distributed into UHMWPE matrix and good cross-linked with the matrix. SEM-map EDS analysis confirmed SEM. FTIR results revealed that HAp incorporation into matrix was conducted and crystallization of UHMWPE increased by increment in amount of HAp results in deepening crystallization peaks at nearby 500 and 1500 cm -1 . DSC results, which is useful technique to determine the variation of melting point and crystallization ratio of UHMWPE composites, indicated that there was no remarkable change in melting points of composites, while crystallinity of the samples generally showed slight increase by increasing amount of nano HAp particles. The tensile test instrument was utilized to determine elastic modulus of the samples and their elastic modulus were raised from 1050 to 1900 MPa with higher HAp reinforcement. It can be concluded that UHMWPE-1 % wt. HAp composites have promising results by being paired with crystallinity and elastic modulus.

Hygrothermal aging effects on tribological and mechanical behaviors of mollusc shell-reinforcement UHMWPE biocomposites

“…10 Consequently, to further enhance the wear behaviour of UHMWPE, numerous researches are concentrating on the fillers incorporated in the UHMWPE matrix. For example, many authors have chosen to reinforce polymers with filler particles and fibers such as natural coral, 11 zeolite, 12 carbon fiber, 13 multi-wall carbon nanotube, 14 corn starch, 15 graphene oxide, 10,16 hydroxyapatite, 17 mollusc shell, 18 etc. Efe et al 17 studied the effect of adding hydroxyapatite (HAP) under the different percentages of filler (0.5, 1, and 2 wt.…”

“…For example, many authors have chosen to reinforce polymers with filler particles and fibers such as natural coral, 11 zeolite, 12 carbon fiber, 13 multi-wall carbon nanotube, 14 corn starch, 15 graphene oxide, 10,16 hydroxyapatite, 17 mollusc shell, 18 etc. Efe et al 17 studied the effect of adding hydroxyapatite (HAP) under the different percentages of filler (0.5, 1, and 2 wt. % of HAP) on the mechanical properties of the UHMWPE.…”

“…In fact, this increase is explained by the increase in cross-linking and thus the mechanical properties of the UHMWPE. 17 Golchin et al 19 analyzed the influence of the incorporation of carbon nanotubes (MWNT) and graphene oxide (GO), on the tribological behavior of the UHMWPE matrix against CoCr. It was found that regardless of the treatment performed, the GO or MWNT reinforced composites exhibit superior tribological properties in terms of wear and friction behaviors compared to unfilled UHMWPE.…”