Crystallization and phase behavior in nylon 6/aromatic polyimide triblock copolymers

Fu, Qiang; Livengood, Bryan P.; Shen, Ching-Chang; Lin, F.; Harris, Frank W.; Cheng, Stephen Z. D.; Hsiao, Benjamin S.; Yeh, Fengji

doi:10.1002/(sici)1521-3935(19980601)199:6<1107::aid-macp1107>3.0.co;2-d

Cited by 26 publications

(19 citation statements)

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“…The polymer synthesized in DMAc is expected to have more rigidity than that synthesized in NMP because of the presence of the polyimide order. This expectation is based on previous studies of aromatic polyimides suggesting that interactions and structural order generally increase rigidity …”

Section: Resultsmentioning

confidence: 93%

“…The PEG phase is less well understood in the PDODA case due to the structural dominance of the polyimide structural characteristics P asrOO and F lrOO . These features arise from polyimide interaction or alignment on short and long length scales, and are comparable to aromatic features in other aromatic polyimides . The features related to polyimide regularity may be overshadowing any feature corresponding to the PEG on the nanometer scale.…”

Section: Resultsmentioning

confidence: 94%

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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: Resultsmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 94%

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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“…The found difference between the diffraction patterns of all studied samples is the intensity redistribution of these four characteristic components. It is known19–21 that PCA can be routinely obtained as one of the two possible crystalline polymorphs, viz. , monoclinic α or pseudohexagonal γ or generate the amorphous form as well.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of grafted copolymers of aromatic polyimides and ε‐caprolactam

Volkova

Vygodskii

Zabegaeva

et al. 2009

J of Applied Polymer Sci

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Anionic polymerization of e-caprolactam was performed in the presence of only 5 wt % of aromatic polyimides having five-and six-membered imide cycles and bearing hexafluoroisopropylidene, ether, fluorene, siloxane, phthalide, or SO 3 HA groups, both in the polymer backbone and as side moieties. The synthesized new copolymers were fully characterized by IR spectroscopy, thermomechanical analysis, dilatometry, and X-ray diffraction. Tough and frictional properties of the obtained copolymers were estimated as well. It was found that on the selection of polyimide activator it is possible to gain the desirable control over the polymer properties, namely the gel-fraction content, phase composition, compression modulus, notched Izod impact strength, temperature of frictional contact, friction coefficient, etc. These investigations will facilitate the choice of the optimum macromolecular activator for the modification of both the synthetic method and the properties of the commercial polycaproamide.

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“…The first polyisocyanate‐based rod–coil block copolymer was reported more than 50 years ago . The functional nature of rod blocks makes rod–coil block copolymers promising for numerous applications: organic electronics, biotechnology, and many others . The considerable chemical difference between rod and coil blocks results in microphase separation at a lower molecular weight of each block, and thus, smaller feature size.…”

Section: Rod–coil Systemsmentioning

confidence: 99%

Discovery of Structural Complexity through Self‐Assembly of Molecules Containing Rodlike Components

Zhang

Yan

et al. 2020

Chemistry A European J

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Hierarchicals tructures are important for transferring and amplifying molecular functions to macroscopic properties of materials. In this regard,r odlikem olecules have emerged as one of the most promising molecular building blockst oc onstruct functional materials. Although the self-assembly of conventional molecules containing rodlike components generally results in nematic or layered smectic phases, due to the preferred parallel arrangements of rodlikec omponents, extensive efforts have revealed that rational molecular design provides aversatile platform to en-gineer richs elf-assembled structures. Herein, first successes achieved in polyphilic liquid crystals and rod-coil block systems are summarized.S pecial attention is paidt or ecent progress in the conjugation of rodlikeb uilding blocks with other molecular building blocks through the molecular Lego approach. Rod-based giant surfactants, sphere-rod conjugates, and dendritic rodlike molecules are covered. Future perspectives of the self-assembly of molecules containing rodlike components are also provided.[a] Dr.Figure 7. Perforated lamellar phase observedi nrod-coil diblock oligomers. a) TEM image of as olution-cast thin film stained with RuO 4 .b)Aselectedarea electron diffraction pattern of an unstained film. c)SAXS pattern. d) Schematic representation of perforated lamellar phasesf ormed by rodcoil diblocko ligomers. The rod segmentsa re alignedaxially perpendicular to the layer plane with ah erringbone arrangement. Reprinted with permission from ref. [35].

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Crystallization and phase behavior in nylon 6/aromatic polyimide triblock copolymers

Cited by 26 publications

References 0 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

Synthesis and characterization of grafted copolymers of aromatic polyimides and ε‐caprolactam

Discovery of Structural Complexity through Self‐Assembly of Molecules Containing Rodlike Components

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