Morphologies of Polymer Crystals in Thin Films

Reiter, Günter; Botiz, Ioan; Graveleau, Laetitia; Grozev, Nikolay A.; Albrecht, Krystyna; Mourran, Ahmed; Möller, Martin

doi:10.1007/3-540-47307-6_11

Cited by 56 publications

(30 citation statements)

References 61 publications

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“…Layer‐multiplying coextrusion provides a flexible processing tool to decrease individual layer thicknesses through the microscale and approaching the nanoscale dimensions of individual polymer molecules. Crystalline polymers confined in ultrathin spin‐coated layers,37, 38 or microphase separated block structures containing at least one crystallizable block,39 have produced specific crystal orientations and unique lamellar morphologies. One dimensional confinement of crystalline polymers by layer‐multiplying coextrusion provides an advantage over the preceding techniques in the ability to achieve long range, defect free nano‐confinement in films with thousands of individual layers.…”

Section: Nanolayered Polymer Systems With Improved Propertiesmentioning

confidence: 99%

Polymer Nanostructures by Forced Assembly: Process, Structure, and Properties

Ponting

Hiltner

Baer

2010

Macromolecular Symposia

144

143

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The process of micro-and nanolayer coextrusion of polymeric systems with good layer uniformity is described. Coextrusion through a series of layer multiplying die elements has enabled the production of films containing tens to thousands of layers with individual layer thicknesses from the micro-to the nanoscale. Improvements in layer uniformity are discussed through optimization of layer multiplier die design, selection of viscosity matched polymer systems, and incorporation of surface layer capabilities. Design of 'uneven' split layer multiplication dies has enabled the coextrusion of layered films with a wide variety of layer thickness distributions having up to a 10Â difference in the individual film layer thicknesses. Coextrusion of layered polymer films with individual layer thicknesses down to the nanoscale has resulted in the production of novel systems with improved properties. Nanolayered polymer films were utilized to develop an all-plastic polymer laser, to fabricate gradient refractive index lenses, and to investigate gas barrier enhancement of crystalline polymer nanolayers confined to induce a high aspect ratio, in-plane, single-crystal-like lamellar structure.

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Section: Nanolayered Polymer Systems With Improved Propertiesmentioning

confidence: 99%

Polymer Nanostructures by Forced Assembly: Process, Structure, and Properties

Ponting

Hiltner

Baer

2010

Macromolecular Symposia

144

143

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“…Moreover, polymer thin films have been a subject of academic debates for over the past 20 years [28][29][30][31]. In the particular case of semicrystalline polymers, the confinement imposed by the thin film geometry, and the polymer-substrate adsorption effects, resulted in differences in the crystallization rate [32,33], crystalline morphology [34][35][36], thermal transitions and polymers' molecular dynamics [32,37]. In turn, preparing poly(alkylene 2,5-furanoate)s can be also a way to tune their physical properties, at nanoscale levels.…”

Section: Introductionmentioning

confidence: 99%

Poly(alkylene 2,5-furanoate)s thin films: Morphology, crystallinity and nanomechanical properties

Robles‐Hernández

Soccio

Castrillo

et al. 2020

Polymer

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Poly(alkylene 2,5-furanoate)s are considered as the most attractive and interesting alternatives to replace oil-based terephthalic polymers. These furan-based polyesters can be synthesized using fully bio-based synthetic strategies, allowing to reduce the environmental impact of plastics. At the same time, these polymers have shown outstanding thermal, mechanical and gas-barrier properties. All these results envisage their industrial use in the near future. Now, considering the downscaling of the products' size towards the nanometer scale, we present a study of the morphology and nanomechanical properties of poly(alkylene 2,5-furanoate) thin films. Using Atomic Force Microscopy, we report the development of nanostructures upon crystallization, following different thermal treatments, for thin films with thicknesses below 200 nm. Moreover, we studied the impact of crystal growth in the nanomechanical properties of these materials. We found that the polymer thin films preserve their excellent mechanical response even in the confined geometry, as proved by the Young's moduli values close to the GPa, accompanied by high surface stiffness, and low indentation depths. The poly(alkylene 2,5-furanoate) thin films were found to have nanomechanical properties comparable to those of the oil-based poly(ethylene terephthalate), a further evidence that in the future they could replace traditional polymers in several applications.

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“…AFM results show that UV–LC has the best surface roughness with a root mean square roughness of ≈2.3 nm while UV–SilkHTP (≈8.5 nm) is better than UV–Silk30 (≈23.8 nm), over an area of 5 × 5 µm. We postulate that, during drying, silk fibroin proteins spontaneously form micro and nanoscale wrinkled patterns guided by a diffusion‐limited aggregation process which has been observed in the assembly of a range of materials including colloids, polymer thin films, peptides, and proteins . This is partially due to the polarity mismatch between photoreactive silk resists consisting of strongly polar side groups, such as hydroxyl, carboxyl, and amino groups (thus strongly polar) and the IPA‐treated silicon (weakly polar) substrate, which can be improved by appropriate surface treatment of silicon substrates (details in the Supporting Information).…”

Section: Resultsmentioning

confidence: 98%

Precise Protein Photolithography (P³): High Performance Biopatterning Using Silk Fibroin Light Chain as the Resist

et al. 2017

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Precise patterning of biomaterials has widespread applications, including drug release, degradable implants, tissue engineering, and regenerative medicine. Patterning of protein‐based microstructures using UV‐photolithography has been demonstrated using protein as the resist material. The Achilles heel of existing protein‐based biophotoresists is the inevitable wide molecular weight distribution during the protein extraction/regeneration process, hindering their practical uses in the semiconductor industry where reliability and repeatability are paramount. A wafer‐scale high resolution patterning of bio‐microstructures using well‐defined silk fibroin light chain as the resist material is presented showing unprecedent performances. The lithographic and etching performance of silk fibroin light chain resists are evaluated systematically and the underlying mechanisms are thoroughly discussed. The micropatterned silk structures are tested as cellular substrates for the successful spatial guidance of fetal neural stems cells seeded on the patterned substrates. The enhanced patterning resolution, the improved etch resistance, and the inherent biocompatibility of such protein‐based photoresist provide new opportunities in fabricating large scale biocompatible functional microstructures.

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Morphologies of Polymer Crystals in Thin Films

Cited by 56 publications

References 61 publications

Polymer Nanostructures by Forced Assembly: Process, Structure, and Properties

Polymer Nanostructures by Forced Assembly: Process, Structure, and Properties

Poly(alkylene 2,5-furanoate)s thin films: Morphology, crystallinity and nanomechanical properties

Precise Protein Photolithography (P³): High Performance Biopatterning Using Silk Fibroin Light Chain as the Resist

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Morphologies of Polymer Crystals in Thin Films

Cited by 56 publications

References 61 publications

Polymer Nanostructures by Forced Assembly: Process, Structure, and Properties

Polymer Nanostructures by Forced Assembly: Process, Structure, and Properties

Poly(alkylene 2,5-furanoate)s thin films: Morphology, crystallinity and nanomechanical properties

Precise Protein Photolithography (P3): High Performance Biopatterning Using Silk Fibroin Light Chain as the Resist

Contact Info

Product

Resources

About

Precise Protein Photolithography (P³): High Performance Biopatterning Using Silk Fibroin Light Chain as the Resist