Poly(butylene succinate)-based composites containing β-cyclodextrin/d-limonene inclusion complex. (June 2016)

• Record Type: Journal Article
• Authors: Mallardo, Salvatore; De Vito, Valentina; Malinconico, Mario; Volpe, Maria Grazia; Santagata, Gabriella; Di Lorenzo, Maria Laura
• Is Part Of: European polymer journal. Volume 79(2016:Jun.)
• Page Start: 82
• Page End: 96
• Publication Date: 2016-06
• Subjects: Poly(butylene succinate) -- β-Cyclodextrin -- d-Limonene -- Biocomposites -- Thermal stabilization; Polymers -- Periodicals; Polymerization -- Periodicals; Polymères -- Périodiques; Polymérisation -- Périodiques; Polymerization; Polymers; Periodicals; Electronic journals; 547.705
• DOI: 10.1016/j.eurpolymj.2016.04.024
• Languages: English
• ISSNs: 0014-3057

Abstract

Graphical abstract: Highlights: Inclusion complex (IC) ofd -limonene inside β-cyclodextrins (β-CD) cages was prepared. Poly(butylene succinate) (PBS) and IC composites were prepared by melt extrusion. Homogeneous dispersion of IC in PBS was proven by optical microscopy and infrared spectroscopy. d -limonene was thermally stabilized upon inclusion within β-CD cages as shown by TGA analysis. IC delays melt crystallization of PBS as shown by isothermal and non-isothermal DSC analysis. Abstract: Structural, morphological and thermal properties of films based on poly(butylene succinate) (PBS) and inclusion complex (IC) of β-cyclodextrins (β-CD) andd -limonene were studied, in order to prepare novel bio-active food packaging materials. Formation of the inclusion complex was proved by infrared spectroscopy, nuclear magnetic resonance, and X-ray diffraction. The IC contains 7 wt% ofd -limonene, as quantified by precipitation, as well as by 13 C NMR and by thermogravimetry. Inclusion within β-CD cavity stabilizesd -limonene against evaporation, which allows melt compounding with PBS. Infrared spectroscopy of compression molded composite films, evidenced both thed -limonene encapsulation inside β-CD cages, and the occurrence of interactions between hydroxyl groups of β-CD-lim complex and the carbonyl groups of PBS units. Optical micrographs showed a phase separated morphology, with homogeneous distribution of the IC within the PBS matrix, probably due to interactions between the polar groups of the composite components. DSC analysis highlighted the anti-nucleating action of β-CD-lim complex towards PBS, evidenced by a significant delay in crystallization kinetics of PBS.