Mixing of immiscible polymers using nanoporous coordination templates

Uemura, Takashi; Kaseda, Tetsuya; Sasaki, Yukichi; Inukai, Munehiro; Toriyama, Takaaki; Takahara, Atsushi; Jinnai, Hiroshi; Kitagawa, Susumu

doi:10.1038/ncomms8473

Cited by 69 publications

(39 citation statements)

References 47 publications

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“…The DTG curve (derivative of the TG curve) clearly indicated that the decomposition of the polymeric structures was driven by 2 events similar to those that can be found in the degradation of polymethylmethacrylate, PMMA. However, compared to the linear PMMA which decomposes in the temperature range 250‐400°C, the acrylic crosslinked resin of the 3D structure, decomposes at higher temperature (from 300 to 475°C).…”

Section: Resultsmentioning

confidence: 99%

Polymer‐derived SiCN cellular structures from replica of 3D printed lattices

et al. 2018

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In comparison with metals and polymers, ceramics and/or carbon are more difficult to process into well‐defined cellular architectures (e.g., cubic, tetrakaidecadehron, etc.) using Additive Manufacturing techniques. The present work reports a simple method for generating complex and precise SiCN ceramic lattices using a preceramic polymer and applying the replica approach to structures fabricated using stereolithography of plastic materials, with the associated ease of fabrication. Three‐dimensional printed plastic lattices impregnated with a polysilazane were converted to SiCN by pyrolysis at 1000°C in inert atmosphere. In spite of the high amount of mass loss (~58%) and volume shrinkage (~65%), the impregnated structures did not collapse during pyrolysis, leading to highly porous (total porosity ~93 vol%) components possessing suitable strength for handling and potential use as lightweight components.

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Section: Resultsmentioning

confidence: 99%

Polymer‐derived SiCN cellular structures from replica of 3D printed lattices

et al. 2018

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“…42 Projection images were taken from -70 o to 70 o at an angular interval of 1 o . The tilt series of TEM images were reconstructed according to the conventional protocol: they were aligned by the fiducial marker method using the Au NPs as fiducial markers, then 3D images were reconstructed by the filtered back projection algorithm.…”

Section: Electron Tomographymentioning

confidence: 99%

Lateral Growth of 1D Core-Crystalline Micelles upon Annealing in Solution

et al. 2016

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The emergence of one-dimensional (1D) micelles obtained from the crystallization driven self-assembly (CDSA) in solution of crystalline-coil block copolymers has opened the door to the fabrication of a variety of sophisticated structures. While the development of these fascinating nanomaterials is blossoming, there is very little fundamental work dedicated to understanding the morphological evolution of these 1D micelles in solution. Here, using a combination of transmission electron microscopy, electron tomography, and static and dynamic light scattering, we studied the effect of annealing on a colloidal suspension of 1D micelle fragments formed by the self-assembly of a crystalline-coil poly(ferrocenyldimethylsilane)-block-poly(isoprene) (PFS-b-PI) block copolymer in decane, a solvent selective for PI. We are particularly interested in studying the evolution of the rectangular cross-section of the crystalline core of these micelle fragments. By electron tomography, we observed that the shorter dimension of the cross-section became even thinner upon annealing at elevated temperatures, while the longer dimension increased. In parallel, we observed an increase in packing density of the crystalline block as the fragments were annealed at temperatures above 60 °C. From these results, we concluded that annealing the micelle fragments induces a thinning of the crystalline core coupled with a lateral growth.

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“…The cured resins with polyimide were slightly darker than the pure CE/EP, and exhibited a homogeneous pellet form similar to that of CE/EP. Generally, it is not thermodynamically favorable for the mixing of two different polymers with high level of uniformity because of the low entropy of mixing, which makes phase separation a common phenomenon in most polymer blends . However, in the case of CE/EP‐PI, both CE/EP and polyimide contained high contents of aromatic rings, and their similarity in chemical structure facilitated the association of the two parts.…”

Section: Resultsmentioning

confidence: 99%

Polyimide incorporated cyanate ester/epoxy copolymers for high‐temperature molding compounds

Song

Hah

et al. 2018

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

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The rapid development of high‐power devices has driven the requirement for high‐temperature stable epoxy molding compounds. In this work, a designed polymer blend system consisting of cyanate ester/epoxy copolymers modified by polyimide (CE/EP‐PI) has been studied. Polyimide used in this study has shown excellent dispersity in the cyanate ester and epoxy copolymer network (CE/EP), exhibiting homogeneous phase with a denser polymer network structure. With this polymer blend structure, CE/EP‐PI system was proved to have a glass transition temperature as high as ~270 °C, increased modulus, and largely enhanced fracture toughness up to 2.06 MPa m1/2. CE/EP‐PI resins showed outstanding long‐term stability at high temperature with low mass loss and increased fracture toughness after aging at 200 °C. This work provides a novel insight into the development of molding compounds based on polymer blends system with excellent high‐temperature properties. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2018, 56, 2412–2421

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Mixing of immiscible polymers using nanoporous coordination templates

Cited by 69 publications

References 47 publications

Polymer‐derived SiCN cellular structures from replica of 3D printed lattices

Polymer‐derived SiCN cellular structures from replica of 3D printed lattices

Lateral Growth of 1D Core-Crystalline Micelles upon Annealing in Solution

Polyimide incorporated cyanate ester/epoxy copolymers for high‐temperature molding compounds

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