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

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 w...

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Bibliographic Details
Published in:Materials 2021-12, Vol.15 (1), p.184
Main Authors: Pietrzykowska, Elżbieta, Romelczyk-Baishya, Barbara, Chodara, Agnieszka, Koltsov, Iwona, Smogór, Hilary, Mizeracki, Jan, Pakieła, Zbigniew, Łojkowski, Witold
Format: Article
Language:English
Subjects:
3-D printers
Biocompatibility
Biomedical materials
Bones
Calcium phosphates
Ceramics
Compressive strength
Contact angle
Hot pressing
Hydroxyapatite
Isostatic pressing
Mechanical properties
Medical research
Microstructure
Modulus of elasticity
Nanocomposites
Nanoparticles
Optimization
Orthopedics
Polylactic acid
Polymers
Porosity
Regeneration
Surgical implants
Tensile strength
Transplants & implants
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Summary: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.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma15010184