The double melting behavior of a liquid crystalline polyimide derived from PMDA and 1,3-bis[4-(4′-aminophenoxyl) cumyl] benzene

Liu, Songlin; Chung, Tai‐Shung; Oikawa, Hideaki; Yamaguchi, Akihiro

doi:10.1002/1099-0488(20001201)38:23<3018::aid-polb40>3.0.co;2-9

Cited by 21 publications

(14 citation statements)

References 42 publications

(63 reference statements)

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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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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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“…It is in accordance with calorimetric studies performed by Dollase et al [32], which have shown that double melting peaks are typical for linear PDMS samples, while different types of cross-linked PDMS systems display single melting peak. Extensive literature inspection on the possible explanation of double or multimelting phenomenon was carried out by Liu et al [33]. They have observed double melting behavior of a liquid crystalline polyimide, which was interpreted due to melting of two types of crystallites.…”

Section: Discussionmentioning

confidence: 93%

Molecular dynamics in grafted polydimethylsiloxanes

Jancelewicz

Nowaczyk

Makrocka-Rydzyk

et al. 2010

Journal of Non-Crystalline Solids

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“…At the same time, crystalline regions play an important role like physical crosslinking does, maintaining polymer mechanical properties at certain level, even above its T g . Thus, research on the crystalline polyimide is highly valuable [29,30].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Semicrystalline Polyimides Containing Bridged Linkages

Chen

2018

International Journal of Polymer Science

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A series of polyimides (PI) containing bridged linkages were prepared successfully through a three-step technique. The results indicated that the glass transition temperature (T g ) of polyimides was affected by flexibility of polymer chain and the intermolecular interactions. ODPA-TPER-based polyimide possesses the lowest T g , which was 214°C. All polyimides had semicrystalline characteristics, and ODPA-TPER-based PI exhibited the lowest melting temperature (T m ) at 316°C. The polyimides had high weight loss temperatures, which indicated that bridged linkages can reduce the softening temperature, meanwhile keeping excellent thermal stability.

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The double melting behavior of a liquid crystalline polyimide derived from PMDA and 1,3-bis[4-(4′-aminophenoxyl) cumyl] benzene

Cited by 21 publications

References 42 publications

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

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

Molecular dynamics in grafted polydimethylsiloxanes

Synthesis and Characterization of Semicrystalline Polyimides Containing Bridged Linkages

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