Isoconversional Glass Transition Kinetics and Fragility Determination of Poly[(ethylene 2,6-naphthalate)-co -(butylene 2,6-naphthalate)] Random Copolymers

2011 ◽  
Vol 212 (7) ◽  
pp. 730-736 ◽  
Author(s):  
George Z. Papageorgiou ◽  
Dimitris S. Achilias ◽  
George P. Karayannidis
Keyword(s):  
Glass Transition ◽  
Random Copolymers ◽  
Glass Transition Kinetics ◽  
Poly Ethylene

scholarly journals Thermomechanical properties of PEGDA in combination with different photo-curable comonomers

2019 ◽  
Vol 5 (1) ◽  
pp. 319-321
Author(s):  
Natalia Rekowska ◽  
Daniela Arbeiter ◽  
Thomas Eickner ◽  
Niels Grabow ◽  
Michael Teske ◽  
...  
Keyword(s):  
Glass Transition ◽  
Biomedical Application ◽  
Thermomechanical Properties ◽  
Glycol Diacrylate ◽  
Physico Chemical ◽  
3D Geometry ◽  
Pentaerythritol Triacrylate ◽  
Basic Characteristics ◽  
Poly Ethylene

AbstractThe technology of pharmaceutical drug delivery systems (DDS) as an individual and adjustable tool for drug administration has been intensively developed in the last years. Additive manufacturing (AM) techniques, such as stereolithography, are a promising approach towards DDS scaffold manufacturing. Stereolithography, by using layerby- photo-polymerisation, creates DDS scaffolds with highly controlled 3D geometry. Combined with inkjet printing it allows a very precise positioning of the drug depot in the basic scaffold and therefore also a better control of the drug release. Furthermore, this hybrid AM technique also allows for the creation of a multi-drug DDS with a several drug depots localized in desired positions within the scaffold. Determination of the scaffold and drug depot material properties is one of the initial steps for such novel DDS development. Basic characteristics, such as stiffness, elasticity or glass transition temperature (Tg), are important for designing and adapting the material for biomedical application. The photosensitive poly(ethylene glycol) diacrylate (PEGDA) can be easily formed into a desired biocompatible scaffold geometry via stereolithography. In this study we have focused on the evaluation of PEGDA (Mn=700 g/mol) as a pure and copolymer system in combination with other acrylates (butanediol diacrylate, pentaerythritol triacrylate) as possible materials for DDS using this novel hybrid AM technique. Irgacure 2959, a biocompatible photoinitiator (PI), was used as a radical starter for photopolymerisation. Samples varying in PI and coacrylate concentration were prepared by conventional photopolymerisation. Physico-chemical analyses of the samples were performed and several parameters, such as stiffness, elongation at break and glass transition temperatures, were determined.

Poly(ethylene glycol-co-1,4-cyclohexanedimethanol terephthalate) random copolymers: effect of copolymer composition and microstructure on the thermal properties and crystallization behavior

RSC Advances ◽  
2015 ◽  
Vol 5 (74) ◽  
pp. 60570-60580 ◽  
Author(s):  
Tingting Chen ◽  
Guodong Jiang ◽  
Guoyu Li ◽  
Zhipeng Wu ◽  
Jun Zhang
Keyword(s):  
Glass Transition ◽  
Thermal Properties ◽  
Crystallization Behavior ◽  
Random Copolymers ◽  
Sequence Length ◽  
Copolymer Composition ◽  
Poly Ethylene Glycol ◽  
Average Sequence Length ◽  
Average Sequence ◽  
Poly Ethylene

The glass transition temperature of the statistically random PETG copolymers increased linearly with the increasing CT content. An increase in the average sequence length resulted in a higher melting temperature.

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