A study on the melting and crystallization of polyoxymethylene-copolymer/hydroxyapatite nanocomposites
PBN-AR
Instytucja
Wydział Inżynierii Materiałowej i Ceramiki (Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie)
Informacje podstawowe
Główny język publikacji
EN
Czasopismo
Polymers for Advanced Technologies
ISSN
1042-7147
EISSN
1099-1581
Wydawca
Wiley-Blackwell
Rok publikacji
2013
Numer zeszytu
3
Strony od-do
318--330
Numer tomu
24
Link do pełnego tekstu
Identyfikator DOI
Liczba arkuszy
0.9
Autorzy
(liczba autorów: 5)
Pozostali autorzy
+ 3
Słowa kluczowe
EN
nanocomposites
polyoxymethylene
isothermal crystallization kinetics
TOPEM DSC
PALS
solid-state NMR
AFM
Streszczenia
Język
EN
Treść
In this work, isothermal crystallization kinetics of polyoxymethylene copolymer (POM) in POM/hydroxyapatite (HAp) nanocomposites has been investigated. Melting behavior and crystalline structure formation were studied using TOPEM DSC, positron lifetime spectroscopy (PALS), atomic force microscopy (AFM) and 13C and 31P solid-state NMR. The highest degree of crystallinity was found for POM/0.5% HAp nanocomposite and the lowest for POM/2.5% HAp. Isothermal crystallization analysis showed that an introduction of HAp nanoparticles led to effective heterogeneous nucleation and formation of crystals with higher Avrami exponent. Besides, changes in overall crystallization rate were observed - the highest overall crystallization rate was found for POM/0.5% HAp sample, while the lowest for POM/2.5% HAp was observed. Generally, for POM in POM/HAp nanocomposites, a significant decrease in nucleation activation energy (Kg), and the fold surface free energy (σe) was found. For nanocomposite containing 2.5% HAp, heterogeneous nucleation takes place as well, but too high concentration of nanoparticles hinders POM crystallization and enhances formation of more defected crystals as confirmed by AFM data. The presence of HAp nanoparticles in the POM matrix was confirmed by 31P MAS-NMR, but their influence on the crystallization process was not observed in the 13C CP-MAS-NMR spectra. © 2012 John Wiley & Sons, Ltd.
Cechy publikacji
original article
peer-reviewed
Inne
System-identifier
idp:073207
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