Effect of hydroxyapatite nano-particles on morphology, rheology and thermal behavior of poly(Caprolactone)/chitosan blends
2016 (English)In: Materials science & engineering. C, biomimetic materials, sensors and systems, ISSN 0928-4931, E-ISSN 1873-0191, Vol. 59, 980-989 p.Article in journal (Refereed) PublishedText
The effect of hydroxyapatite nano-particles (nHA) on morphology, and rheological and thermal properties of PCL/chitosan blends was investigated. The tendency of nHA to reside in the submicron-dispersed chitosan phase is determined using SEM and AFM images. The presence of electrostatic interaction between amide sites of chitosan and ionic groups on the nHA surface was proved by FTIR. It is shown that the chitosan phase is thermodynamically more favorable for the nano-particles to reside than the PCL phase. Lack of implementation of Cox-Merz theory for this system shows that the polymer-nano-particle network is destructed by the flow. Results from dynamic rheological measurements and Zeiler fractional model show that the presence of nHA increases the shear moduli and relaxation time of the PCL/chitosan blends. DSC measurements showed that nHA nano-particles are responsible for the increase in melting and crystallization characteristics of the PCL/chitosan blends. Based on thermogravimetric analysis, the PCL/chitosan/nHA nano-composites exhibited a greater thermal stability compared to the nHA-free blends.
Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 59, 980-989 p.
Poly(caprolactone), Chitosan, Hydroxyapatite nano-particles, Morphology, Rheology
IdentifiersURN: urn:nbn:se:kth:diva-180584DOI: 10.1016/j.msec.2015.10.076ISI: 000367107400115ScopusID: 2-s2.0-84946887862OAI: oai:DiVA.org:kth-180584DiVA: diva2:896609
QC 201601212016-01-212016-01-192016-01-26Bibliographically approved