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Article

Microstructure and Mechanical Properties of Inverse Nanocomposite Made from Polylactide and Hydroxyapatite Nanoparticles

1
Institute of High Pressure Physics, Polish Academy of Sciences, Sokolowska 29/37, 01-142 Warsaw, Poland
2
Faculty of Materials Science and Engineering, Warsaw University of Technology, Woloska 141, 02-507 Warsaw, Poland
3
NETZSCH Instrumenty, Halicka 9, 31-036 Krakow, Poland
*
Author to whom correspondence should be addressed.
Academic Editor: Jadwiga Laska
Materials 2022, 15(1), 184; https://doi.org/10.3390/ma15010184
Received: 26 October 2021 / Revised: 16 December 2021 / Accepted: 18 December 2021 / Published: 27 December 2021
Polymer nanocomposites have been extensively researched for a variety of applications, including medical osteoregenerative implants. However, no satisfactory solution has yet been found for regeneration of big, and so-called critical, bone losses. The requirement is to create a resorbable material which is characterised by optimum porosity, sufficient strength, and elastic modulus matching that of the bone, thus stimulating tissue regrowth. Inverse nanocomposites, where the ceramic content is larger than the polymer content, are a recent development. Due to their high ceramic content, they may offer the required properties for bone implants, currently not met by polymer nanocomposites with a small number of nanoparticles. This paper presents inverse nanocomposites composed of bioresorbable nano crystalline hydroxyapatite (HAP NPs) and polylactide (PLLA), produced by cryomilling and a warm isostatic pressing method. The following compositions were studied: 25%, 50%, and 75% of HAP NPs by volume. The mechanical properties and structure of these composites were examined. It was discovered that 50% volume content was optimal as far as compressive strength and porosity are concerned. The inverse nanocomposite with 50% nanoceramics volume displayed a compressive strength of 99 ± 4 MPa, a contact angle of 50°, and 25% porosity, which make this material a candidate for further studies as a bioresorbable bone implant. View Full-Text
Keywords: inverse composites; biomaterials; mechanical properties inverse composites; biomaterials; mechanical properties
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MDPI and ACS Style

Pietrzykowska, E.; Romelczyk-Baishya, B.; Chodara, A.; Koltsov, I.; Smogór, H.; Mizeracki, J.; Pakieła, Z.; Łojkowski, W. Microstructure and Mechanical Properties of Inverse Nanocomposite Made from Polylactide and Hydroxyapatite Nanoparticles. Materials 2022, 15, 184. https://doi.org/10.3390/ma15010184

AMA Style

Pietrzykowska E, Romelczyk-Baishya B, Chodara A, Koltsov I, Smogór H, Mizeracki J, Pakieła Z, Łojkowski W. Microstructure and Mechanical Properties of Inverse Nanocomposite Made from Polylactide and Hydroxyapatite Nanoparticles. Materials. 2022; 15(1):184. https://doi.org/10.3390/ma15010184

Chicago/Turabian Style

Pietrzykowska, Elżbieta, Barbara Romelczyk-Baishya, Agnieszka Chodara, Iwona Koltsov, Hilary Smogór, Jan Mizeracki, Zbigniew Pakieła, and Witold Łojkowski. 2022. "Microstructure and Mechanical Properties of Inverse Nanocomposite Made from Polylactide and Hydroxyapatite Nanoparticles" Materials 15, no. 1: 184. https://doi.org/10.3390/ma15010184

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