Wyniki wyszukiwania - BazTech

1

The influence of Material Extrusion process parameters on the porosity and mechanical properties of PLA products for medical applications

Rusińska Małgorzata, Gruber Piotr, Ziółkowski Grzegorz, Łabowska Magdalena, Wilińska Karolina, Szymczyk-Ziółkowska Patrycja

Acta of Bioengineering and Biomechanics

|

2023

|

Vol. 25, no. 3

EN

The study addresses the growing need for personalized medicine and cost-effective manufacturing by investigating additive manufacturing (AM). It employs the Design of Experiments (DOE) to explore how fused filament fabrication (FFF) parameters affect porosity and mechanical properties of medical-grade polylactide (PLA) samples.

2

Influence of bioactive metal fillers on antimicrobial properties of PA12 composites produced by laser-based Powder Bed Fusion of Polymers

Gruber Piotr, Szymczyk-Ziolkowska Patrycja, Olejarczyk Michał, Junka Adam, Fabianowska-Majewska Krystyna, Brozyna Malwina, Kurzynowski Tomasz

Acta of Bioengineering and Biomechanics

|

2023

|

Vol. 25, no. 4

EN

This study investigated the influence of three types of metallic microfillers, spherical silver and spherical, and dendritic copper, on the ability of polyamide 12 (PA12) to inhibit microorganism growth on the surfaces of samples produced using laser-based powder bed fusion of polymers (PBF-LB/P). The aim of this study was to initially characterize these materials regarding their potential applicability for parts dedicated to use in the hospitals, which surfaces are periodically disinfected using chemical and/or physical measures.

3

Influence of bioactive metal fillers on microstructural homogeneity of PA12 composites produced by polymer Laser Sintering

Gruber Piotr, Ziółkowski Grzegorz, Olejarczyk Michał, Grochowska Emilia, Hoppe Viktoria, Szymczyk-Ziółkowska Patrycja, Kurzynowski Tomasz

Archives of Civil and Mechanical Engineering

|

2022

|

Vol. 22, no. 3

art. no. e117

EN

In this paper, polyamide 12 (PA12) blends with three types of metallic fillers are tested, which differ in the type of material and its’ morphology. Low content mixtures are taken into consideration (0.5, 1.0, 2.0, 5.0 wt%), since a low impact on mechanical properties along with obtaining antibacterial properties are desired. The investigation focuses on filler distribution as well as the influence on microstructural homogeneity of the base material after processing with polymer Laser Sintering. Moreover, the influence of the filler content on the mechanical properties and fracture behaviour were examined. Processability PA12 with bioactive metal fillers was confirmed, and no significant changes in ductile behaviour of PA12 were observed. An in-depth analysis of the effect of the filler on microstructural homogeneity was conducted.

4

Investigation of porosity behavior in SLS polyamide-12 samples using ex-situ X-ray computed tomography

Ziółkowski Grzegorz, Grochowska Emilia, Kęszycki Dawid, Gruber Piotr, Hoppe Viktoria, Szymczyk-Ziółkowska Patrycja, Kurzynowski Tomasz

Materials Science Poland

|

2021

|

Vol. 39, No. 3

436--445

EN

The paper presents a detailed description of the method of carrying out static tensile tests in ex-situ X-ray computed tomography (XCT) conditions. The study compares samples manufactured with the use of additive technology in two orientations, horizontally and vertically, which correspond to the in-layer and between-layer sintering mechanisms. Both the fracture mechanism and porosity behavior differed significantly for the two manufacturing directions. The conducted analysis made it possible to compare the changes in porosity, the number of pores, and also their diameters and shape before and after the tensile test. This allows for in-depth identification and better understanding of the phenomena occurring during the static tensile test of polyamide-12 samples manufactured using selective laser sintering (SLS) technology.

5

Comparison of thermal, structural and morphological properties of poly(l-lactide) and poly(l-lactide)/ hydroxyapatite microspheres for laser sintering processes

Krokos Anna, Gazińska Małgorzata, Kryszak Bartłomiej, Dzienny Paulina, Stępak Bogusz, Olejarczyk Michał, Gruber Piotr, Kwiatkowski Ryszard, Bondyra Agnieszka, Antończak Arkadiusz

Polimery

|

2020

|

T. 65, nr 9

605--612

EN

A comparison of poly(l-lactide) (PLLA) and poly(l-lactide)/hydroxyapatite (PLLA/HAp) biocomposite microspheres fabricated by emulsion solvent evaporation technique designed for laser sintering (LS) applications is presented. Key properties such as thermal and structural as well as geometry, size distribution and powder flowability, which are crucial for this technique, are characterized to validate the applicability of microspheres for LS. The biocomposite microspheres turns out to be more suitable for the LS process than PLLA due to the higher thermal stability, broader sintering window and higher powder flowability.

PL

Porównano właściwości mikrosfer z poli(l-laktydu) (PLLA) i z biokompozytu poli(l-laktyd)/ hydroksyapatyt (PLLA/HAp), przygotowanych metodą emulsyjną z odparowaniem rozpuszczalnika, przeznaczonych do procesu spiekania laserowego (LS). W celu weryfikacji przydatności mikrosfer do LS scharakteryzowano kluczowe dla tej techniki właściwości: termiczne i strukturalne oraz geometrię, rozkład wymiarów i sypkość proszku. Wykazano, iż mikrosfery biokompozytowe wykazują lepsze właściwości predestynujące je do przetwarzania metodą LS niż mikrosfery PLLA, w tym większą stabilność termiczną, szersze okno parametrów spiekania i większą sypkość proszku.

6

A review of fabrication polymer scaffolds for biomedical applications using additive manufacturing techniques

Szymczyk-Ziólkowska Patrycja, Labowska Magdalena Beata, Detyna Jerzy, Michalak Izabela, Gruber Piotr

Biocybernetics and Biomedical Engineering

|

2020

|

Vol. 40, no. 2

624--638

EN

This paper presents the current state-of-the art of additive manufacturing (AM) applications in the biomedical field, especially in tissue engineering. Multiple advantages of additive manufacturing allow to precise three-dimensional objects fabrication with complex struc-ture using various materials. Depending on the purpose of the manufactured part, different AM technologies are implemented, in which a specific material can be utilized. In the biomedical field, there are used several techniques such as: Binder Jetting, Material Extru-sion, Material Jetting, Powder Bed Fusion, Sheet Lamination, Vat Polymerization. This article focuses on the utilization of polymer materials (natural and synthetic) taking into account hydrogels in scaffolds fabrication. Assessment of polymer scaffolds mechanical properties enables personalized patient care, as well as prevents damage after implantation in human body. By controlling process parameters it is possible to obtain optimised mechanical properties of manufactured parts.