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  4. Supercritical CO2 deposition and foaming process for fabrication of biopolyester–ZnO bone scaffolds
 
Zitierlink DOI
10.26092/elib/2627
Verlagslink DOI
10.1002/app.45824

Supercritical CO2 deposition and foaming process for fabrication of biopolyester–ZnO bone scaffolds

Veröffentlichungsdatum
2018-02-15
Autoren
Ivanovic, Jasna  
Rezwan, Kurosch  
Kroll, Stephen  
Zusammenfassung
Subsequent supercritical CO2-assisted deposition and foaming process followed by in situ synthesis was used to fabricate functional polylactide (PLA) and polylactide–poly(E-caprolactone) (PLA–PCL) bone scaffolds. Deposition of zinc bis(2-thenoyltri-
fluoroacetonate) as a ZnO precursor onto biopolyester substrates (30 MPa; 110 8C) was followed by fast depressurization to create cellular structure. Contact time was optimized regarding the deposition yield (2 h), while PCL content in PLA was varied (1–10 wt %).
Scaffolds impregnated with the precursor were treated with hydrazine alcoholic solution to obtain biopolyester–ZnO composites. Precursor synthesis and deposition onto the scaffolds was confirmed by Fourier-transform infrared. Processed scaffolds had micron-sized pores (d50  20 lm). High open porosity (69–77%) and compressive strength values (2.8–8.3 MPa) corresponded to those reported for trabecular bone. PLA blending with PCL positively affected precursor deposition, crystallization rate, and compressive strength of the scaffolds. It also improved PLA surface roughness and wettability which are relevant for cell adhesion. ZnO improved compressive strength of the PLA scaffolds without significant effect on thermal stability. Analysis of structural, thermal, and mechanical properties of biopolyester–ZnO scaffolds testified a great potential of the obtained platforms as bone scaffolds. Proposed processing route is
straightforward and ecofriendly, fast, easy to control, and suitable for processing of thermosensitive polymers.
Schlagwörter
biomedical applications

; 

biopolymers and renewable polymers

; 

composites

; 

foams
Verlag
Wiley
Institution
Universität Bremen  
Fachbereich
Fachbereich 04: Produktionstechnik, Maschinenbau & Verfahrenstechnik (FB 04)  
Institute
Fachgebiet 17: Keramische Werkstoffe und Bauteile  
Dokumenttyp
Artikel/Aufsatz
Zeitschrift/Sammelwerk
Journal of Applied Polymer Science  
Band
135
Heft
7
Startseite
1
Endseite
11
Seitenzahl
11
Zweitveröffentlichung
Ja
Dokumentversion
Postprint
Lizenz
Alle Rechte vorbehalten
Sprache
Englisch
Dateien
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Vorschaubild
Name

IVANOVIC - Supercritical CO2 deposition and foaming process.pdf

Size

813.56 KB

Format

Adobe PDF

Checksum

(MD5):0e9443b4c952e35949caad0eabf898bc

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