Thermoreversible gelation of biodegradable polyester (PHBV) in toluene

Pich, Andrij; Schiemenz, Nadine; Boyko, Volodymyr; Adler, Hans‐Juergen P.

doi:10.1016/j.polymer.2005.11.070

Cited by 22 publications

(13 citation statements)

References 24 publications

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“…After that, the macroemulsion was miniemulsified during 180 s at 70% amplitude in a pulse regime (30 s sonication, 10 s pause) using a Fisher‐Scientific 450 W sonifier and a 1/2″ tip. A water bath at 40 °C was used to avoid PHBV gelation during sonication. Reactions were performed at 72 °C under nitrogen atmosphere.…”

Section: Methodsmentioning

confidence: 99%

Poly(3‐hydroxybutirate‐co‐3‐hydroxyvalerate)–Polystyrene Hybrid Nanoparticles via Miniemulsion Polymerization

Leimann

Costa

Gonçalves

et al. 2015

Macro Reaction Engineering

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Hybrid polymer nanoparticles were obtained by miniemulsion polymerization of styrene with poly(3-hydroxybutirate-co-3-hydroxyvalerate) (PHBV). Lower polymerization rates were obtained with the gradual addition of PHBV. These results were represented by simulations using a mathematical model that takes into account grafting reactions between the growing polymeric chains and PHBV double bonds (reduced molar mass). Hybrid nanoparticles presented average diameters of up to 113 nm and grafting yield of 94.4%. The hybrid fractions obtained by Selective Soxhlet Extraction were characterized with Fourier Transform Infrared Spectroscopy, Differential Scanning Calorimetry and Transmission Electron Microscopy. Blend nanoparticles were used to confirm the hybrid formation

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Section: Methodsmentioning

confidence: 99%

Poly(3‐hydroxybutirate‐co‐3‐hydroxyvalerate)–Polystyrene Hybrid Nanoparticles via Miniemulsion Polymerization

Leimann

Costa

Gonçalves

et al. 2015

Macro Reaction Engineering

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“…Stirring rates exceeding 300 rpm lead to destabilized emulsion due to high shear forces. 25 Additionally, choice of surfactant and salt concentration influence emulsion stability. Nonionic surfactants are needed, because they do not precipitate upon salt addition.…”

Section: Synthesis Of Ips Microgelsmentioning

confidence: 99%

Microgels based on isotactic poly(styrene): Synthesis and characterization

Tschage

Beckerle

Rahimi

et al. 2016

J. Polym. Sci. Part A: Polym. Chem.

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Poly(styrene) microgels are known, but the influence of tacticity on particle formation and behavior has not been investigated yet. Isotactic poly(styrene) (iPS) with M n 5 15-120 kg/mol is synthesized by coordinate polymerization and cross-linked by Friedel-Crafts alkylation in a miniemulsion. Nuclear magnetic resonance (NMR) spectroscopy, light microscopy, cryogenic transmission electron microscopy, and wide-angle powder diffraction are applied to understand the structure of microgels obtained. Typically, spherical microgels with overall diameter of 40-500 nm are found. Isotacticity of the polymer is retained during microgel formation. Increase of cross-linker content leads to partial crystallinity inside the microgel.

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“…This hybrid material [ 1 ⋅ BPE ] 2 ⊙MWCNT resulted in a very stable suspension that could be aligned under a magnetic field. Aiming at preserving the alignment after the stimulus was removed, hybrid [ 1 ⋅ BPE ] 2 ⊙MWCNT was mixed with poly(hydroxybutyrate‐co‐hydroxyvalerate) (PHBV, 4 mol % PHV content), an organic biodegradable polymer that is known to form organogels …”

Section: Introductionmentioning

confidence: 99%

Templating Porphyrin Anisotropy via Magnetically Aligned Carbon Nanotubes

et al. 2019

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The preparation and characterisation of a novel three‐dimensional organic material consisting of porphyrin arrays on carbon nanotubes embedded in an organogel is reported. Firstly, the porphyrin array was prepared through metal‐ligand coordination of a ditopic ligand (1,2‐bis(4‐pyridyl)ethane) and two bis‐Zn(II) porphyrins, linked through a pyrene core, and was studied through UV‐Vis, NMR and diffusion spectroscopies. Secondly, the porphyrin supramolecular architecture was adsorbed on pristine carbon nanotubes, greatly improving the dispersibility of the latter in organic solvents. The hybrid material was characterised by means of UV‐Vis spectroscopy, microscopic techniques and thermogravimetric analysis. Finally, by exploiting the anisotropic magnetic susceptibility of carbon nanotubes, the hybrid material was aligned under a magnetic field, the organisation of which could be maintained by in situ gelation. The resultant hybrid organogel exhibited notable optical anisotropy, suggesting an anisotropic arrangement of the porphyrin‐CNTs architectures in the macroscopic material.

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Thermoreversible gelation of biodegradable polyester (PHBV) in toluene

Cited by 22 publications

References 24 publications

Poly(3‐hydroxybutirate‐co‐3‐hydroxyvalerate)–Polystyrene Hybrid Nanoparticles via Miniemulsion Polymerization

Poly(3‐hydroxybutirate‐co‐3‐hydroxyvalerate)–Polystyrene Hybrid Nanoparticles via Miniemulsion Polymerization

Microgels based on isotactic poly(styrene): Synthesis and characterization

Templating Porphyrin Anisotropy via Magnetically Aligned Carbon Nanotubes

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