| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Thurn-Albrecht, Thomas
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (41/41 displayed)
- 2024Poly-3-hydroxybutyrate, a Crystal-Mobile Biodegradable Polyester
- 2024Controlling crystal orientation in films of conjugated polymers by tuning the surface energy
- 2023On thermodynamics and kinetics of interface-induced crystallization in polymers
- 2023How entanglements determine the morphology of semicrystalline polymers
- 2022Bulk enthalpy of melting of Poly (l-lactic acid) (PLLA) determined by fast scanning chip calorimetry
- 2022Bulk Enthalpy of Melting of Poly (l-lactic acid) (PLLA) Determined by Fast Scanning Chip Calorimetry
- 2022Competition between crystal growth and intracrystalline chain diffusion determines the lamellar thickness in semicrystalline polymerscitations
- 2022Competition between crystal growth and intracrystalline chain diffusion determines the lamellar thickness in semicrystalline polymers
- 2021Digitally Tuned Multidirectional All-Polyethylene Composites via Controlled 1D Nanostructure Formation during Extrusion-Based 3D Printingcitations
- 2020Influence of ω-Bromo Substitution on Structure and Optoelectronic Properties of Homopolymers and Gradient Copolymers of 3-Hexylthiophenecitations
- 2020Structure–Property Relationships of Microphase-Separated Metallosupramolecular Polymerscitations
- 2019Intracrystalline Dynamics in Oligomer‐Diluted Poly(Ethylene Oxide)citations
- 2018Modular Synthesis and Structure Analysis of P3HT-b-PPBI Donor–Acceptor Diblock Copolymerscitations
- 2018The Underestimated Effect of Intracrystalline Chain Dynamics on the Morphology and Stability of Semicrystalline Polymerscitations
- 2017Manipulating Semicrystalline Polymers in Confinementcitations
- 2016Influence of Fullerene Grafting Density on Structure, Dynamics, and Charge Transport in P3HT-<i>b</i>-PPC<sub>61</sub>BM Block Copolymerscitations
- 2016Thermally stable and efficient polymer solar cells based on a novel donor-acceptor copolymercitations
- 2016Crystallization of Poly(ethylene oxide) with a Well-Defined Point Defect in the Middle of the Polymer Chaincitations
- 2014Detection of Surface-Immobilized Components and Their Role in Viscoelastic Reinforcement of Rubber–Silica Nanocompositescitations
- 2014Studying Twin Samples Provides Evidence for a Unique Structure-Determining Parameter in Simplifed Industrial Nanocompositescitations
- 2014Donor–acceptor block copolymers carrying pendant PC<sub>71</sub>BM fullerenes with an ordered nanoscale morphologycitations
- 2014Nanostructure and Rheology of Hydrogen-Bonding Telechelic Polymers in the Melt: From Micellar Liquids and Solids to Supramolecular Gelscitations
- 2014Studying Twin Samples Provides Evidence for a Unique Structure-Determining Parameter in Simplifed Industrial Nanocompositescitations
- 2013Phase Separation in the Melt and Confined Crystallization as the Key to Well-Ordered Microphase Separated Donor–Acceptor Block Copolymerscitations
- 2013Crystallization of Supramolecular Pseudoblock Copolymerscitations
- 2012Investigation of the different stable states of the cantilever oscillation in an atomic force microscopecitations
- 2012Mechanical Properties and Cross-Link Density of Styrene–Butadiene Model Composites Containing Fillers with Bimodal Particle Size Distributioncitations
- 2012Thermotropic Behavior, Packing, and Thin Film Structure of an Electron Accepting Side-Chain Polymercitations
- 2011Poly(ε-caprolactone)-poly(isobutylene): A crystallizing, hydrogen-bonded pseudo-block copolymercitations
- 2011Crystallization and Melting of Poly(ethylene oxide) in Blends and Diblock Copolymers with Poly(methyl acrylate)citations
- 2010Morphology development and compatibilization effect in nanoclay filled rubber blendscitations
- 2010Fabrication and characterization of a biomimetic composite scaffold for bone defect repaircitations
- 2010High Crystallinity and Nature of Crystal−Crystal Phase Transformations in Regioregular Poly(3-hexylthiophene)citations
- 2010Tuning and Switching the Hypersonic Phononic Properties of Elastic Impedance Contrast Nanocompositescitations
- 2010Fiber - and Tube - Formation by Melt Infiltration of Block Copolymers into Al<sub>2</sub> O<sub>3</sub> -Porescitations
- 2009Quantitative Analysis of Scanning Force Microscopy Data Using Harmonic Modelscitations
- 2004Semicrystalline morphology in thin films of poly(3-hexylthiophene)
- 2001On exfoliation of montmorillonite in epoxycitations
- 2001Electrohydrodynamic instabilities in polymer films
- 2000X-ray scattering study and molecular simulation of glass forming liquids: Propylene carbonate and salolcitations
- 2000Electrically induced structure formation and pattern transfer citations
Places of action
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article
Crystallization and Melting of Poly(ethylene oxide) in Blends and Diblock Copolymers with Poly(methyl acrylate)
Abstract
Blends of poly(ethylene oxide) (PEO) and poly(methyl acrylate) (PMA) as well as the respective diblock copolymers PEO-b-PMA form a homogeneous melt and undergo crystallization of PEO upon cooling. Although an identical PEO (Mn = 5000 g/mol) is used in blends and diblock copolymers, crystallization and melting behavior at comparable PMA contents differs strongly as revealed by temperature-resolved small-angle X-ray scattering (TR-SAXS) and differential scanning calorimetry (DSC) measurements. After isothermal crystallization, PEO lamellae in the blends thicken during heating from once-folded to extended chain crystals prior to melting as revealed by TR-SAXS. Contrarily, in PEO-b-PMA a thickening to extended chain lamellae is impossible when the PMA block exceeds an Mn of about 3000 g/mol. This behavior is caused by a balance between the tendency of the crystallizable block to form extended chain crystals, the tendency of the noncrystallizable chains to adopt a maximum in conformational entropy, and the space requirements of the these chains at the crystalline−amorphous interface. Thus, chain-folded crystals of PEO are formed as a compromise when the noncrystallizable chains become sufficiently long and can be considered to be in thermodynamic equilibrium. Equilibrium melting temperatures for neat PEO, Tm0, and for PEO in blends and diblock copolymers, Tm,b0, are determined using both the Hoffman−Weeks and the Gibbs−Thomson approach. Values determined by the Hoffman−Weeks method are generally lower compared to values obtained by the Gibbs−Thomson approach, which can be explained by inherent differences in extrapolation procedures. The maximum equilibrium melting point depression Tm0 − Tm,b0 is found to be 2 K in blends and 7 K in diblock copolymers. In the case of blends, melting point depression can be explained by Flory’s entropy contribution of miscible polymer blends.