Next Article in Journal
Evaluating Phthalate Contaminant Migration Using Thermal Desorption–Gas Chromatography–Mass Spectrometry (TD–GC–MS)
Next Article in Special Issue
Polysaccharide Coating of Gelatin Gels for Controlled BSA Release
Previous Article in Journal
Some Important Issues of the Commercial Production of 1-D Nano-PANI
Previous Article in Special Issue
Polymer Grafted Aluminum Nanoparticles for Percolative Composite Films with Enhanced Compatibility
Article

Isothermal Crystallization Kinetics and Morphology of Double Crystalline PCL/PBS Blends Mixed with a Polycarbonate/MWCNTs Masterbatch

1
Department of Chemistry, University of the Free State (Qwaqwa Campus), Private Bag X13, Phuthaditjhaba 9866, South Africa
2
Central University of Technology, Department of Life Sciences, Private Bag X20539, Bloemfontein 9300, South Africa
3
Center for Advanced Materials, Qatar University, P.O. Box 2713 Doha, Qatar
4
Group ‘Materials + Technologies’ (GMT), Department of Chemical and Environmental Engineering, Faculty of Engineering, Gipuzkoa, University of the Basque Country UPV/EHU, Donostia-San Sebastián 20018, Spain
5
Polymat and Polymer Science and Technology Department, Faculty of Chemistry, University of the Basque Country UPV/EHU, Paseo Manuel de Lardizabal 3, Donostia-San Sebastián 20018, Spain
6
Ikerbasque, Basque Foundation for Science, Bilbao 48013, Spain
*
Authors to whom correspondence should be addressed.
Polymers 2019, 11(4), 682; https://doi.org/10.3390/polym11040682
Received: 19 March 2019 / Revised: 8 April 2019 / Accepted: 12 April 2019 / Published: 15 April 2019
(This article belongs to the Special Issue Nanostructured Polymers and Nanocomposites)
In this work, the 70/30 and 30/70 w/w polycaprolactone (PCL)/polybutylene succinate (PBS) blends and their corresponding PCL/PBS/(polycarbonate (PC)/multiwalled carbon nanotubes (MWCNTs) masterbatch) nanocomposites were prepared in a twin-screw extruder. The nanocomposites contained 1.0 and 4.0 wt% MWCNTs. The blends showed a sea-island morphology typical of immiscible blends. For the nanocomposites, three phases were formed: (i) The matrix (either PCL- or PBS-rich phase depending on the composition), (ii) dispersed polymer droplets of small size (either PCL- or PBS-rich phase depending on the composition), and (iii) dispersed aggregates of tens of micron sizes identified as PC/MWCNTs masterbatch. Atomic force microscopy (AFM) results showed that although most MWCNTs were located in the PC dispersed phase, some of them migrated to the polymer matrix. This is due to the partial miscibility and intimate contact at the interfaces between blend components. Non-isothermal differential scanning calorimetry (DSC) scans for the PCL/PBS blends showed an increase in the crystallization temperature (Tc) of the PCL-rich phase indicating a nucleation effect caused by the PBS-rich phase. For the nanocomposites, there was a decrease in Tc values. This was attributed to a competition between two effects: (1) The partial miscibility of the PC-rich and the PCL-rich and PBS-rich phases, and (2) the nucleation effect of the MWCNTs. The decrease in Tc values indicated that miscibility was the dominating effect. Isothermal crystallization results showed that the nanocomposites crystallized slower than the neat blends and the homopolymers. The introduction of the masterbatch generally increased the thermal conductivity of the blend nanocomposites and affected the mechanical properties. View Full-Text
Keywords: PC/MWCNTs masterbatch; PCL/PBS blends; nanocomposites; morphology; conductivity; isothermal crystallization PC/MWCNTs masterbatch; PCL/PBS blends; nanocomposites; morphology; conductivity; isothermal crystallization
Show Figures

Graphical abstract

MDPI and ACS Style

Gumede, T.P.; Luyt, A.S.; Tercjak, A.; Müller, A.J. Isothermal Crystallization Kinetics and Morphology of Double Crystalline PCL/PBS Blends Mixed with a Polycarbonate/MWCNTs Masterbatch. Polymers 2019, 11, 682. https://doi.org/10.3390/polym11040682

AMA Style

Gumede TP, Luyt AS, Tercjak A, Müller AJ. Isothermal Crystallization Kinetics and Morphology of Double Crystalline PCL/PBS Blends Mixed with a Polycarbonate/MWCNTs Masterbatch. Polymers. 2019; 11(4):682. https://doi.org/10.3390/polym11040682

Chicago/Turabian Style

Gumede, Thandi P., Adriaan S. Luyt, Agnieszka Tercjak, and Alejandro J. Müller 2019. "Isothermal Crystallization Kinetics and Morphology of Double Crystalline PCL/PBS Blends Mixed with a Polycarbonate/MWCNTs Masterbatch" Polymers 11, no. 4: 682. https://doi.org/10.3390/polym11040682

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop