A new approach for patterning epiclon-based polyimide precursor films using a lyotropic liquid crystal template

Cosutchi, Andreea Irina; Hulubei, Camelia; Stoica, Iuliana; Ioan, Silvia

doi:10.1007/s10965-011-9653-z

Cited by 25 publications

(14 citation statements)

References 61 publications

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“…In previous investigations [21–23], we have synthesized different polyimide structures based on cycloaliphatic dianhydrides, such as homo‐ and co‐polyimides. We have also studied some special properties of various polyimide‐based blend systems, related to morphological and structural‐rheological aspects [24], blood compatibility [25], or different novel approaches for patterning such type of polymers [26].…”

Section: Introductionmentioning

confidence: 99%

Origin of dielectric response and conductivity of some alicyclic polyimides

Ioan¹,

Hulubei²,

Popovici³

et al. 2012

Polymer Engineering & Sci

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High‐performance alicyclic‐containing polyimides for advanced applications, derived from 5‐(2,5‐dioxotetrahydrofurfuryl)‐3‐methyl‐3‐cyclohexene‐1,2‐dicarboxylic acid anhydride or bicyclo[2.2.2]oct‐7‐ene‐2,3,5,6‐ tetracarboxylic dianhydride and two flexible aromatic diamines, were synthesized by a classical two‐step polycondensation reaction. The dielectric spectra behavior over wide frequency and temperature ranges of 1 Hz‐1 MHz and –150°C÷+250°C, respectively, was investigated according to chemical and micro‐structural aspects. The dielectric constants have low values and are dependent on dianhydride flexibility and diamine links, in relation with the charge–transfer complex (CTC) and free volume, and, consequently, with packing of the polymer chains and polarizable groups per volume units. All polyimide films develop two relaxation processes, i.e., γ and β relaxation, involving different enthalpy and entropy contributions induced by their chemical structures. Frequency–temperature‐dependent conductivity showed that conductivity increased with frequency and also that energy bandgap representation could be suitable for explaining the temperature influence on AC‐conductivity. POLYM. ENG. SCI., 2013. © 2012 Society of Plastics Engineers

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Section: Introductionmentioning

confidence: 99%

Origin of dielectric response and conductivity of some alicyclic polyimides

Ioan¹,

Hulubei²,

Popovici³

et al. 2012

Polymer Engineering & Sci

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“…By addition of PAA in the system the dimensions of the large bands increase because the hydrogen bonds might lead to the stretching of the HPC serpentine fibers. The effect is accentuated as the content of PAA is increased -situation sustained by AFM images [72,73]. The imidization process does not affect the aspect of the final surface texture, as presented in Figure 20.…”

Section: Patterning Pi Surface With Sheared Lc Matrixmentioning

confidence: 82%

“…A new approach for patterning polyimide, starting from its precursor, consists in using a lyotropic liquid crystal template, , namely hydroxypropyl cellulose (HPC), which under shear conditions exhibits a banded texture [72,73] (Figure 17). Besides the specific interactions, such as the hydrogen bonds between Epiclon-based PAA corresponding to PI4 and the LC component, a slight cross-linking produced in the precursor structure by UV irradiation can be applied to stabilize the resulting morphology.…”

Section: Patterning Pi Surface With Sheared Lc Matrixmentioning

confidence: 99%

Semi-Alicyclic Polyimides: Insights into Optical Properties and Morphology Patterning Approaches for Advanced Technologies

Barzic¹,

Stoica²,

Hulubei³

2012

High Performance Polymers - Polyimides Based - From Chemistry to Applications

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“…[82] Nach der ersten Beschreibung eines CNC-Nanokomposits auf Poly(styrol-co-butylacrylat)-Basis durch Favier et al 1995 [83] wurde das Gebiet der CNC-verstärkten Polymere rasch erweitert. [86] Nach Entfernen der HPC wurde die chiral-nematische Ordnung aber zerstçrt. Die Polymerisation der Monomere kann während oder nach EISA erfolgen und durch Säure, Base oder UV-Bestrahlung induziert werden.…”

Section: Organische Materialienunclassified

Funktionsmaterialien mit Cellulose‐basierten Flüssigkristall‐Templaten

et al. 2014

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Cellulose‐Nanokristalle (cellulose nanocrystals, CNCs) sind seit über 50 Jahren bekannt, gewinnen aber erst heute große Aufmerksamkeit aufgrund ihrer Eigenschaften wie hoher spezifischer Festigkeit, hohen Elastizitätsmoduls, großer Oberfläche und faszinierender optischer Eigenschaften. Erst kürzlich wurde ihr Potenzial als supramolekulare Template erkannt, bei denen ihr Selbstorganisationsverhalten in wässrigen Dispersionen in Gegenwart geeigneter Vorstufen genutzt wird. Die Kombination von Mesoporosität, photonischen Eigenschaften und chiral‐nematischer Ordnung der Funktionsmaterialien, die als freistehende Filme verfügbar sind, führte zu zahlreichen vielversprechenden Entdeckungen. Unser Aufsatz fasst die Verwendung von Cellulosederivaten, besonders von CNCs, als neuen Templaten zusammen und gibt eine Übersicht über die aktuellen Entwicklungen im Kontext neuer Funktionsmaterialien.

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A new approach for patterning epiclon-based polyimide precursor films using a lyotropic liquid crystal template

Cited by 25 publications

References 61 publications

Origin of dielectric response and conductivity of some alicyclic polyimides

Origin of dielectric response and conductivity of some alicyclic polyimides

Semi-Alicyclic Polyimides: Insights into Optical Properties and Morphology Patterning Approaches for Advanced Technologies

Funktionsmaterialien mit Cellulose‐basierten Flüssigkristall‐Templaten

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