Characterisation of the mechanical properties of polyamide 12 powder when using titanium dioxide as antimicrobial additive

Abstract

Antimicrobial properties of plastic components are an important part of polymer engineering. One commonly used additive with an antibacterial effect is titanium dioxide. The aim of this study is to investigate the influences on the mechanical properties resulting from the addition of titanium dioxide as an antimicrobial additive and the processing of the compounds with selective laser sintering. Compounds with 5 %, 10 % and 15 % titanium dioxide and polyamide 12 as matrix material are fabricated. Tensile test specimen are produced from the compounds, examined and the results compared with virgin polyamide 12. The investigations show a general loss in the ultimate tensile strength compared to the virgin polyamide 12. Comparing the different titanium dioxide contents with each other, an increasing tensile strength with increasing titanium dioxide content of the compound can be examined. A decreasing elongation at break and thus a decreasing ductility can also be observed. Furthermore, the results of the tensile test show a stiffening effect, i. e. an increase in the elastic modulus due to the addition of titanium dioxide.

Determination of the flexural properties of additively manufactured polyamide 12 components with antimicrobial titanium dioxide additives

“…For the production of the compounds, matrix material and additive were processed in the mixer for 1 : 45 hours at a temperature of 130 °C. These mixing parameters have already proven to be suitable in previous studies [11,15,16]. The polyamide 12 powder DuraForm PA (3D-Systems Inc., Germany) was selected as the matrix material since this material has been developed for usage in the selective laser sintering process.…”

“…In previous studies, the antibacterial effect and the tensile properties of the compounds have already been determined [15,16]. The aim of the present study is to investigate possible changes in the flexural properties of different polyamide 12 compounds when using titanium dioxide as an antimicrobial additive.…”

Synthesis and characterization of TiO2 nanoparticles combined with geraniol and their synergistic antibacterial activity

“…Using natural compounds can greatly enhance the inherent physical and chemical properties of NPs [ 30 , 31 ]. For instance, TiO 2 has been used as an antimicrobial additive in polyamide 12 powder, and nitrogen-doped titanium dioxide nanoparticles have demonstrated photoinduced antimicrobial properties under visible-light irradiation [ 32 , 33 ] The small size, high surface energy, and strong hydrophilicity for surface hydroxylation may increase TiO 2 NPs compatibility with polymer materials [ 34 , 35 ]. Incorporating inorganic NPs into organic polymeric nanocomposites is a promising strategy to enhance their antimicrobial properties [ 36 – 38 ].…”