Cross-Linked Liquid Crystalline Polyimides with Siloxane Units: Their Morphology and Thermal Diffusivity

Shoji, Yu; Ishige, Ryohei; Higashihara, Tomoya; Morikawa, Junko; Hashimoto, Toshimasa; Takahara, Atsushi; Watanabe, Junji; Ueda, Mitsuru

doi:10.1021/ma302486s

Cited by 32 publications

(30 citation statements)

References 39 publications

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“…Therefore, enhancement in the thermal conductivity without using the composite strategy is a challenging and important issue. Several technologies to increase the thermal conductivity of these polymers without fillers include chain orientation improvement 7 , 8 , self-assembly of monolayers 9 , chain alignment 5 , 10 , and control of interchain interactions 11 . Typically, highly oriented polymers such as liquid crystalline polymers are promising candidates because the well-oriented liquid crystalline polymer chains effectively conduct phonons through polymeric covalent bonds.…”

Section: Introductionmentioning

confidence: 99%

Filamentous Virus-based Assembly: Their Oriented Structures and Thermal Diffusivity

Sawada

Murata

Marubayashi

et al. 2018

Sci Rep

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Organic polymers are generally regarded as thermal insulators because amorphous arrangement of molecular chains reduces the mean free path of heat-conducting phonons. However, recent studies indicated that single chains of polymers with highly oriented structures could have high thermal conductivity than bulk polymers because stretched polymer chains effectively conduct phonons through polymeric covalent bonds. Here, we demonstrated the possibility of non-covalent virus assembly prepared by simple flow-induced methods toward high thermal conductive polymeric materials. Films with high thermal diffusivity composed of non-covalent bond-based assemblies of liquid crystalline filamentous viruses were prepared using a simple flow-induced orientation method. Structural and thermal characterization demonstrated that highly oriented structures of the viruses in the film were attributed to the high thermal diffusivity. Our results will open attractive opportunities for biomolecular-based thermally conductive soft materials even though the assemblies are based on non-covalent bonds.

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Section: Introductionmentioning

confidence: 99%

Filamentous Virus-based Assembly: Their Oriented Structures and Thermal Diffusivity

Sawada

Murata

Marubayashi

et al. 2018

Sci Rep

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“…The more streamlined, less bulky aromatic portion of the polymer chain is more rigid and planar. The rigidity and planarity lead to a regularity in the orientation of the repeat unit of the polyimide that manifests as an ordered structural feature on the length scale of a few nanometers . The rigidity and planarity of these less bulky aromatic rings give these polymers certain orientations and regularity that are not present in a flexible linear backbone polymer that is able to coil into a wider range of configurations.…”

Section: Introductionmentioning

confidence: 99%

Effects of aromatic regularity on the structure and conductivity of polyimide‐poly(ethylene glycol) materials doped with ionic liquid

Coletta

Toney

Frank

2015

J Polym Sci B Polym Phys

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An understanding of the structure and properties of polymer electrolyte systems can be crucial to a variety of different applications. The current work performs a study of the composition, structure and properties of poly(ethylene glycol) (PEG)-aromatic polyimide systems incorporating ionic liquids that are relevant to several applications especially fuel cell membranes. Composition was varied through using different aromatic dianhydrides, aromatic diamines and in some cases synthesis solvent. Properties were characterized using Fourier transform infrared spectroscopy, thermal gravimetric analysis, differential scanning calorimetry, small-angle x-ray scattering, electrochemical impedance spectroscopy and cyclic voltamme-try. By varying solvent, aromatic regularity and expected rigidity can be tuned, impacting average conductivity by 30%. Varying the aromatic diamine can influence the length scale and amount of aromatic regularity, which can ultimately affect the conductivity by a factor of four. The maximum conductivity reached was 83 mS/cm at 80 C and 70 %RH.

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“…The solid lines in Figure (d) are the best fit obtained using Gaussian function to the measured data shown as open symbols. The I 1 ( φ ) and I 2 ( φ ) so obtained were then used to determine the normalized integral intensity, I ( q ), defined by eq

I_{i} (|, q) \approx \int_{0}^{\frac{π}{2}} I_{i} (|, φ) 2 π q (|||, normals normali normaln φ) d φ, i = 1 normalo normalr 2

…”

Section: Resultsmentioning

confidence: 99%

Effect of molecular weight on microcrystalline structure formation in polymer with perylenediimide side chain

Kido

Nojima

Ishige

et al. 2016

J. Polym. Sci. Part B: Polym. Phys.

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The effect of molecular weight on the molecular aggregation structure of polymers bearing a pendant perylenediimide (PDI) side chain, designated PAc12PDI, was investigated using synchrotron radiation X‐ray diffraction measurements. It was found that depending on molecular weight, either the main chain axis or the side chain axis behaves as the longitudinal axis in fiber samples and was aligned parallel to the fiber axis. A similar phenomenon is present in thin film samples, but was complicated by the additional influence of the interfacial free energy of the side chain group. Even in the case of the polymer with lower molecular weight, the face plane of PDI was found to show both parallel and perpendicular orientations to the substrate (i.e., flat‐on and edge‐on orientations). On the other hand, if the length of the main chain is sufficiently long with respect to the length of the side chain, the face plane of PDI was oriented perpendicular to the substrate, leading to an edge‐on orientation in the thin film. © 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2016, 54, 2275–2283

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Cross-Linked Liquid Crystalline Polyimides with Siloxane Units: Their Morphology and Thermal Diffusivity

Cited by 32 publications

References 39 publications

Filamentous Virus-based Assembly: Their Oriented Structures and Thermal Diffusivity

Filamentous Virus-based Assembly: Their Oriented Structures and Thermal Diffusivity

Effects of aromatic regularity on the structure and conductivity of polyimide‐poly(ethylene glycol) materials doped with ionic liquid

Effect of molecular weight on microcrystalline structure formation in polymer with perylenediimide side chain

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