In this study, polyacrylamide/alginate (PAAm/Alg) based hydrogels have been synthesized and investigated. The four different hydrogels produced contained different concentrations of single-or double-network polymer: 15 wt.% single-network (SN-15), 30 wt.% single-network (SN-30), 15 wt.% double-network (DN-15), and 30 wt.% double-network (DN-30). The tribological performance of these synthesized hydrogels was investigated by using a custom pin-on-disc tribometer in phosphate buffered saline (PBS), where samples were reciprocated against a CoCrMo femoral head under an applied load of 5 or 10 N, at an average sliding speed of 20 mms -1 , and body temperature (37±1 °C). The compressive tangent modulus was also determined by compressing samples at a strain rate of 1 min -1 , while submerged in PBS, at both ambient and body temperatures. The results showed that a higher polymer concentration or a double-network type of structure led to improved friction (lower friction co-efficient) and wear (lower wear track area) properties. Samples also performed better when a lower applied load used. Sample DN-30 exhibited the highest compressive modulus. These outcomes have contributed to the understanding of the mechanical and tribological performance of PAAm/Alg blend hydrogels when performing under certain physiological conditions.
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