Biomaterials, Biodegradables and Biomimetics Research Group

Papers in Scientific Journals

Inclusion complexes of α-cyclodextrins with poly(d,l-lactic acid): structural, characterization, and glass transition dynamics

Abstract

Poly (d,l-lactic acid) (PDLLA) was combined with α-CD to form inclusion complexes (ICs) with distinct PDLLA fractions. The structural changes resulting from this coalescence process were analyzed by Fourier transform infrared spectroscopy (FTIR), proton nuclear magnetic resonance (1H NMR), and X-ray diffraction (XRD). The presence of both components in the ICs was confirmed byFTIR. The encapsulated PDLLA fraction was quantified by 1H NMR. XRD data evidenced that it was possible to transform the amorphous PDLLA into a well-organized channel-type crystalline structure. DSC showed that the glass transition temperature of the PDLLA fraction in the ICs was higher than in the pure polymer, indicating that the ultra-confinement effect imposed by the ICs organization clearly limits PDLLA molecular dynamics. The confinement effect on the glass transition dynamics was investigated by unconventional dynamic mechanical analysis experiments, which confirmed that ICs segmental mobility is highly restricted when compared with the one of pure PDLLA. Bulk PDLLA presents a typical VFTH behavior while the ICs dynamics shows an Arrhenius trend.

Journal
Colloid and Polymer Science
Volume
292
Issue
4
Pagination
863-871
Publisher
Springer Berlin Heidelberg
ISSN
0303-402X
URL
http://link.springer.com/article/10.1007/s00396-013-3127-2
Keywords
Glass transition dynamics, Inclusion complexes, L-lactic acid), Poly(D
Rights
Restricted Access
Peer Reviewed
Yes
Status
published
Year of Publication
2014
DOI
10.1007/s00396-013-3127-2
Date Published
2014-05-01
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