Rheology in shear and elongation and dielectric spectroscopy of polystyrene-block-poly(4-vinylpyridine) diblock copolymers

Kollmetz, Tarek; Georgopanos, Prokopios; Handge, Ulrich A.

doi:10.1016/j.polymer.2017.09.031

Cited by 8 publications

(6 citation statements)

References 49 publications

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“…The fully melt state began at 170–175 °C. The equation for relaxation or equilibration time (τ e ) can be represented as τ e = 2 π ω normalc where ω c is the crossover frequency of Ǵ and G̋ at the high-frequency limit . Thus, relaxation time is related to a predetermined contact period before separation of the master mold and the substrate (demolding).…”

Section: Resultsmentioning

confidence: 99%

Microfabrication of Thermoplastic Polypropylene Surface Structures via Thermal Imprinting for Controlling the Adhesion of Easy Peel Package

Winotapun,

Makmoon,

Aumnate

et al. 2023

ACS Omega

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Micropatterns were fabricated on polypropylene (PP) surfaces using the hot embossing technique with various temperatures ranging from 160 to 175 °C and applying force conditions from 100 to 300 N. To evaluate the replication quality, an effective filling ratio of 1 indicates that the volume of the formed pattern is similar to the mold cavity volume. From the results, the filling ratio increased with increasing the embossing temperature. For instance, under a constant force of 100 N, the filling ratio of polypropylene (PP) with small square arrays (pattern SS) increased from 0.08 to 0.41 when the embossing temperature was raised from 160 to 175 °C, respectively. With the increase of applied force, the filling ratio also increased. At an imprinting temperature of 175 °C and an applied force of 300 N, the highest effective filling ratio that was achieved was approximately 0.99. Furthermore, the effect of PP with different melt flow indexes (MFIs) on the filling ratio was investigated. For food packaging applications, a micropatterned PP sheet was heat-sealed with a biaxially oriented polypropylene (BOPP) film. The micropatterned PP sheet demonstrated easy-opening properties by varying sealing contact areas and micropattern geometries between the sheet and the BOPP film. All micropatterned PP sheets with an MFI of 25 g/10 min exhibited an easy peel property with adhesive failure characteristics at a heat-sealing temperature of 150 °C and a dwell time of 3 s. There was no residue on the PP substrate surface. The overall findings are beneficial in understanding the hot embossing technology for fabricating micropatterns on polymer surfaces, and it can be applied in an easy peel property for packaging applications.

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Section: Resultsmentioning

confidence: 99%

Microfabrication of Thermoplastic Polypropylene Surface Structures via Thermal Imprinting for Controlling the Adhesion of Easy Peel Package

Winotapun,

Makmoon,

Aumnate

et al. 2023

ACS Omega

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“…Anionic polymerization is typically used to synthesize polymers with controlled molecular weight properties. Apart from the synthesis of homopolymers, very often statistical, or block copolymers deriving from the pairs of monomers styrene-isoprene or styrene-vinyl pyridine are synthesized. , Therefore, it is important that a process model is able to describe the copolymerizations to be useful in a broader field of applications. To meet these requirements, the model presented in this study was extended to a copolymerization model of styrene and isoprene.…”

Section: Resultsmentioning

confidence: 99%

Predici as a Polymer Engineers’ Tool for the Synthesis of Polymers via Anionic Polymerization

Kandelhard

Georgopanos

2021

Ind. Eng. Chem. Res.

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In this study, the potential of a combined reaction kinetics model and a heat transfer model for the process development and scale-up of polystyrene synthesis via anionic polymerization, which is later extended to copolymerization with isoprene, is presented. In an innovative way, the program Predici was utilized to describe the requirements needed in the modeling of polymerization in a larger scale. This model combines the precise description of the polymerization reaction kinetics and the prediction of macromolecular properties offered by the program Predici with a heat transfer model to predict safety-relevant parameters such as the temperature and pressure profiles of the reaction system. In this way, it enables the precise investigation of interactions between process parameters and product properties as well as opens the path to optimal process control. Furthermore, changes associated with the scale-up of the process were studied using the model. The developed model was successfully applied to all of these tasks and could be used for fast screening in the development of polymer synthesis.

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“…Additionally, room temperature is well below the glass-transition temperature of polystyrene (around 105 °C). 76 , 77 The protein-containing film ( Figure 5 B) clearly shows an irregular pattern of elevations (white) covering the top of the film surface, associated with the agglomeration of the released protein on top of the film. This finding correlates well with previous studies, 32 which used XPS to verify the release of protein cargo.…”

Section: Results and Discussionmentioning

confidence: 99%

Polystyrene-block-poly(ethylene oxide) Thin Films Fabricated from a Solvent Mixture for the Co-Assembly of Polymers and Proteins

Kollmetz

Gerrard

et al. 2020

ACS Omega

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The co-assembly of peptides and proteins in poly(styrene- block -ethylene oxide) (PS- b -PEO) thin films has proven to be a promising method to fabricate polymer–biomolecule functional materials. Contrary to the covalent immobilization of biomolecules on surfaces, co-assembly presents the opportunity to arrange cargo within thin films, which can be released upon exposure to an aqueous environment. The use of a mixed solvent system ensures the solubilization of hydrophobic polymer as well as the solubilization and protection of the biomolecule cargo. However, to produce largely defect-free films of PS- b -PEO from a solvent mixture containing water is challenging due to the narrow range of solvent miscibility and polymer/protein solubility. This work explores the limits of using a benzene/methanol/water solvent mixture for the production of thin PS- b -PEO films and provides a template for the fabrication optimization of block copolymer thin films in different complex solvent systems. The film quality is analyzed using optical microscopy and atomic force microscopy and correlated to the solvent composition. By adjusting the solvent composition to 80/18.8/1.2 vol % benzene/methanol/water, it was possible to reliably fabricate thin films with less than 1% macroscopic defect surface coverage. Using the optimized solvent composition, we also demonstrate the fabrication of ordered PS- b -PEO films containing lysozyme. Furthermore, we show the release of lysozyme into aqueous media, which highlights the potential use of such films for drug delivery applications.

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Rheology in shear and elongation and dielectric spectroscopy of polystyrene-block-poly(4-vinylpyridine) diblock copolymers

Cited by 8 publications

References 49 publications

Microfabrication of Thermoplastic Polypropylene Surface Structures via Thermal Imprinting for Controlling the Adhesion of Easy Peel Package

Microfabrication of Thermoplastic Polypropylene Surface Structures via Thermal Imprinting for Controlling the Adhesion of Easy Peel Package

Predici as a Polymer Engineers’ Tool for the Synthesis of Polymers via Anionic Polymerization

Polystyrene-block-poly(ethylene oxide) Thin Films Fabricated from a Solvent Mixture for the Co-Assembly of Polymers and Proteins

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