George Nikolaidis

Dr. George Nikolaidis

University of Ioannina, Ioánnina, Ípeiros, Greece
orcid

Research Focus & Metrics

Academic Career Length

23Years (2004-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

View All Publications
17 January 2017 in Industrial & Engineering Chemistry Research
Verified
Journal Article
Closed access
George NikolaidisGeorge Nikolaidis
George Nikolaidis
EKEustathios S. Kikkinides
Eustathios S. Kikkinides
Michael C. GeorgiadisMichael C. Georgiadis
Michael C. Georgiadis

1 March 2018 in Chemical Engineering Research and Design
Verified
Journal Article
Closed access
George NikolaidisGeorge Nikolaidis
George Nikolaidis
EKEustathios S. Kikkinides
Eustathios S. Kikkinides
Michael C. GeorgiadisMichael C. Georgiadis
Michael C. Georgiadis

16 January 2020 in Polymers
Verified
Journal Article
Open access
PDF file
NPNiki Poulopoulou
Niki Poulopoulou
DSDimitra Smyrnioti
Dimitra Smyrnioti
George NikolaidisGeorge Nikolaidis
George Nikolaidis
ITIlektra Tsitsimaka
Ilektra Tsitsimaka
Ermis P. ChristodoulouErmis P. Christodoulou
Ermis P. Christodoulou
George Z. PapageorgiouGeorge Z. Papageorgiou
George Z. Papageorgiou
Intending to expand the thermo-physical properties of bio-based polymers, furan-based thermoplastic polyesters were synthesized following the melt polycondensation method. The resulting polymers, namely, poly(ethylene 2,5-furandicarboxylate) (PEF), poly(propylene 2,5-furandicarboxylate) (PPF), poly(butylene 2,5-furandicarboxylate) (PBF) and poly(1,4-cyclohexanedimethylene 2,5-furandicarboxylate) (PCHDMF) are used in blends together with various polymers of industrial importance, including poly(ethylene terephthalate) (PET), poly(ethylene 2,6-naphthalate) (PEN), poly(L-lactic acid) (PLA) and polycarbonate (PC). The blends are studied concerning their miscibility, crystallization and solid-state characteristics by using wide-angle X-ray diffractometry (WAXD), differential scanning calorimetry (DSC) and polarized light microscopy (PLM). PEF blends show in general dual glass transitions in the DSC heating traces for the melt quenched samples. Only PPF–PEF blends show a single glass transition and a single melt phase in PLM. PPF forms immiscible blends except with PEF and PBF. PBF forms miscible blends with PCHDMF and PPF, whereas all other blends show dual glass transitions in DSC and phase separation in PLM. PCHDMF–PEF and PEN–PEF blends show two glass transition temperatures, but they shift to intermediate temperature values depending on the composition, indicating some partial miscibility of the polymer pairs.

19 January 2016 in Industrial & Engineering Chemistry Research
Verified
Journal Article
Closed access
George NikolaidisGeorge Nikolaidis
George Nikolaidis
EKEustathios S. Kikkinides
Eustathios S. Kikkinides
Michael C. GeorgiadisMichael C. Georgiadis
Michael C. Georgiadis

29 March 2021 in Polymers
Verified
Journal Article
Open access
PDF file
Dimitrios PapageorgiouDimitrios Papageorgiou
Dimitrios Papageorgiou
ITIrini Tsetsou
Irini Tsetsou
RIRaphael Ioannidis
Raphael Ioannidis
George NikolaidisGeorge Nikolaidis
George Nikolaidis
Stylianos ExarhopoulosStylianos Exarhopoulos
Stylianos Exarhopoulos
George Z. PapageorgiouGeorge Z. Papageorgiou
George Z. Papageorgiou
The industrialisation of poly(ethylene 2,5-furandicarboxylate) for total replacement of poly(ethylene terephthalate) in the polyester market is under question. Preparation of high-performing polymer blends is a well-established strategy for tuning the properties of certain homopolymers and create tailor-made materials to meet the demands for a number of applications. In this work, the structure, thermal properties and the miscibility of a series of poly(ethylene terephthalate)/poly(ethylene 2,5-furandicarboxylate) (PET/PEF) blends have been studied. A number of thermal treatments were followed in order to examine the thermal transitions, their dynamic state and the miscibility characteristics for each blend composition. Based on their glass transition temperatures and melting behaviour the PET/PEF blends are miscible at high and low poly(ethylene terephthalate) (PET) contents, while partial miscibility was observed at intermediate compositions. The multiple melting was studied and their melting point depression was analysed with the Flory-Huggins theory. In an attempt to further improve miscibility, reactive blending was also investigated.

30 October 2020 in Materials
Verified
Journal Article
Open access
PDF file
Lazaros PapadopoulosLazaros Papadopoulos
Lazaros Papadopoulos
Eleftheria XanthopoulouEleftheria Xanthopoulou
Eleftheria Xanthopoulou
George NikolaidisGeorge Nikolaidis
George Nikolaidis
AZAlexandra Zamboulis
Alexandra Zamboulis
Dimitris AchiliasDimitris Achilias
Dimitris Achilias
Dimitrios BikiarisDimitrios Bikiaris
Dimitrios Bikiaris
In the era of polymers from renewable resources, polyesters derived from 2,5 furan dicarboxylic acid (FDCA) have received increasing attention due to their outstanding features. To commercialize them, it is necessary to synthesize high molecular weight polymers through efficient and simple methods. In this study, two furan-based polyesters, namely poly (propylene furanoate) (PPF) and poly(butylene furanoate) (PBF), were synthesized with the conventional two-step melt polycondensation, followed by solid-state polycondensation (SSP) conducted at different temperatures and reaction times. Molecular weight, structure and thermal properties were measured for all resultant polyesters. As expected, increasing SSP time and temperature results in polymers with increased intrinsic viscosity (IV), increased molecular weight and reduced carboxyl end-group content. Finally, those results were used to generate a simple mathematical model that prognosticates the time evolution of the materials’ IV and end groups concentration during SSP.