Thermal and microestructural characterization of epoxy-infiltrated hydroxyapatite composite

Abstract

In this work, hydroxyapatite (HAp) obtained from the deorganification of bovine bones using hot NaOH solution was used to synthesize a HAp/epoxy infiltrated composite. Infiltration was carried out by vacuum assisted immersion in hot epoxy resin. The resulting composite was characterized regarding polymer content, morphological aspects and flexural strength. The infiltration method used resulted in thorough infiltration of the HAp but some residual porosity remained. Although the epoxy resin showed good interaction with the HAp, high polymer content was achieved and the flexural strength of the composite was higher than that of the original resin or the HAp, composite strength was lower than that of the human cortical bone.

Mineralized biomimetic collagen/alginate/silica composite scaffolds fabricated by a low-temperature bio-plotting process for hard tissue regeneration: fabrication, characterisation and in vitro cellular activities

“…At 870 C, the contents of the scaffold bioactive layer (hydroxyapatite and silica) were $10.7, 50.5, 59.2 and 86.9% for M-CA, M-CAS-1, M-CAS-2 and M-CAS-3, respectively. TGA data for bovine cortical bone from Roese et al 30 are also shown. Interestingly, the M-CAS-2 scaffold showed decomposition behaviour similar to natural bone.…”

Faster Biomineralization and Tailored Mechanical Properties of Marine-Resource-Derived Hydroxyapatite Scaffolds with Tunable Interconnected Porous Architecture

“…Stage I is attributed to the loss of adsorbed water and the initial burning of wax in the temperature range of 90–350 °C. Further weight loss in the range of 350–415 and 415–670 °C can be attributed to the combustion of the pore former and the removal of lattice water, respectively. ,− Figure b is associated with a total weight loss of 21%, with wheat flour as a pore former. Stage I with a temperature range of 80–330 °C corresponds to the evaporation of adsorbed water and the burning of the pore former.…”

Epoxy composites reinforced with multi-walled carbon nanotube/poly(ethylene glycol)methylether-coated aramid fiber

“…Figure 7 shows that the T g value of neat epoxy was 162°C, whereas for varying weight percentages of reinforced (10,20,30, and 40 wt.%) composites the T g value was 164°C, 168°C, 170°C, and 173°C, respectively. The higher values of T g may be attributed to the introduction of MWCNT-coated aramid fibers, which interacted with the matrix to restrict the mobility of the epoxy network.…”

“…A two-stage curing process is used to form epoxy/single-walled CNT (SWCNT) composites at 80°C for 2 h up to 150°C for 2 h [19]. In another attempt, epoxy-infiltrated hydroxyapatite composites were prepared [20]. A monoglycidyl etherbased epoxy resin and an Epodur 231 curing agent with a 100:27.5 ratio (wt/wt) were used.…”