Micro vs nano: influence of filler size on the rheological and mechanical properties of highly-filled PLA/HAp and PCL/HAp composites

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389013%3A_____%2F25%3A00637190" target="_blank" >RIV/61389013:_____/25:00637190 - isvavai.cz</a>

Result on the web

<a href="https://www.sciencedirect.com/science/article/pii/S2238785425016576?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S2238785425016576?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jmrt.2025.06.234" target="_blank" >10.1016/j.jmrt.2025.06.234</a>

Result language

angličtina

Original language name

Micro vs nano: influence of filler size on the rheological and mechanical properties of highly-filled PLA/HAp and PCL/HAp composites

Original language description

This work aims to elucidate the influence of filler particle size on the rheological behaviour, as well as the micro- and macromechanical properties, of polymer-ceramic composites. For this investigation, two widely used biodegradable polymers, polylactide and polycaprolactone, were selected as the polymer matrices. Hydroxyapatite powders with average particle sizes of 10 μm and 60 nm were used as fillers. A series of composites were prepared using twin-screw extrusion and injection moulding techniques, with micro- and nanoparticle hydroxyapatite concentrations of 20 wt% and 40 wt% for polylactide and 20 wt% for polycaprolactone. The produced materials were subjected to comprehensive analysis, including morphological evaluation (scanning electron microscopy), thermal characterisation (differential scanning calorimetry, thermogravimetric analysis), rheological testing and mechanical property assessment at both micro (micro indentation) and macro (tensile, impact strength) scales. The research was guided by three main objectives: to carry out a comparative analysis of composites with different polymer matrices, to evaluate the effect of the filler on the properties of the given polymer matrix and, finally, to investigate the effect of the filler particle size on the overall performance of the composites. In general, polylactide-based materials exhibited brittleness and strong polymer-filler interactions, whereas polycaprolactone-based materials were ductile and showed weak polymer-filler interactions. Overall, the incorporation of hydroxyapatite resulted in a proportional increase in Young's modulus, with values increasing from 2.4 to 4.3 MPa for polylactide and from 0.25 to 0.59 MPa for polycaprolactone. The use of nanometric filler resulted in more desirable mechanical properties and improved polymer melt stability compared to composites containing micrometric filler. The research makes a valuable contribution to the design and production of composite materials for biomedical applications.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10404 - Polymer science

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of Materials Research and Technology-JMR&T

ISSN

2238-7854

e-ISSN

2214-0697

Volume of the periodical

37

Issue of the periodical within the volume

July/August

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

16

Pages from-to

2919-2934

UT code for WoS article

001528408300001

EID of the result in the Scopus database

2-s2.0-105025396822