Study of thermal and mechanical properties of a biocomposite based on natural rubber and 45S5 Bioglass® particles

Abstract

Biocomposites based on natural rubber (NR) reinforced with 45S5 BioglassÒ (BG) particles were obtained by casting/evaporation method in which NR was dissolved in chloroform and mixed with BG particles. Structural, mechanical, and thermal tests were performed on the biocomposites to evaluate the influence of BG particles on the properties of the NR matrix. Thermogravimetric tests (TG/DTG) of the biocomposites showed decomposition profiles similar to that of NR, and the main peak of the DTG curve was well defined in the temperature range 300-450°C, characteristic of the structural degradation of NR. The TG analysis also revealed that the thermal stability of the samples increases with the increasing quantity of BG in the biocomposite. DMA tests showed higher storage modulus (E 0) values for samples with larger amounts of BG; however, above the T g , the E 0 value tended to zero due to the increased mobility of the polymer chains. By analyzing tan d, the T g values were calculated to be-46 and-50°C for NR and the biocomposite samples, respectively. Mechanical testing demonstrated that the addition of BG to the biocomposite improved the mechanical properties of the samples. The samples became more rigid with the increasing quantity of BG, as demonstrated by decreasing deformation and the increasing elastic modulus (Y) and breaking strength of the samples. The BG particles positively affected the mechanical and thermal properties of the biocomposite, allowing its use in biomedical applications.

Photocatalytic and antimicrobial efficacy of PVDF/TiO2 membranes fabricated by solution blow spinning

“…The incorporation of TiO 2 nanoparticles into the fibers promoted an increasing trend of the elastic modulus from (9 ± 1) MPa for the PVDF membrane to (11 ± 1) MPa at a concentration of 10% m/v. This behavior was attributed to the increased charge transfer from the matrix to the ceramic nanoparticles 67 . Increasing the TiO 2 content did not promote a significant change in the mean elastic modulus values, which was (9 ± 1) MPa for the pure PVDF membranes and (10 ± 2) MPa at a concentration of 60% m/v.…”

“…This behavior was attributed to the increased charge transfer from the matrix to the ceramic nanoparticles. 67 Increasing the TiO 2 content did not promote a significant change in the mean elastic modulus values, which was (9 ± 1) MPa for the pure PVDF membranes and (10 ± 2) MPa at a concentration of 60% m/v. Furthermore, the presence of TiO 2 in the membrane facilitated a significant decrease in the ε break value, with an average reduction of 27% for 10% m/v insertion relative to the PVDF membranes.…”

Evaluation of tensile, thermal, and biological properties of natural rubber‐based biocomposite with biosilicate and 45S5‐K bioglass

“…The mass loss due to this main event was about 90.3%. Decomposition of non‐rubber components, such as fatty acids, produces a small peak between 150 and 280°C, where 6.5% of the mass was lost 65 . At 600°C the final residue of the neat NR was about 2.2%.…”

“…Decomposition of non-rubber components, such as fatty acids, produces a small peak between 150 and 280 C, where 6.5% of the mass was lost. 65 At 600 C the final residue of the neat NR was about 2.2%. As shown in Figure 5b,d, the neat NR corresponds to a small shoulder between 380 and 450 C. It is possible to attribute this shoulder to different degradation temperatures of the other NR constituents.…”

Natural rubber–based composites filled with bioglasses from a CaO‐SiO2‐P2O5‐Ag2O system. Effect of Ag2O concentration in the filler on composite properties

“…The thermal and mechanical properties of natural rubber–based biocomposites filled with bioglass particles composed of 24.3% of Na 2 O, 26.9% of CaO, 2.5% of P 2 O 5 , and 46.3% SiO 2 at 90:10, 70:30, and 50:50 natural rubber:bioglass ratios have been investigated by Silva et al The authors have found enhanced thermal stability of the composite due to higher bioglass amounts, as well as improvement in the mechanical properties, what in their opinion demonstrates potential biomedical applications.…”