Blends of a polyetherimide and a liquid crystalline polymer: Fiber orientation and mechanical properties

Carfagna, Cosimo; Amendola, Eugenio; Nicolais, L.; Acierno, Domenico; Francescangeli, O.; Yang, Bin; Rustichelli, F.

doi:10.1002/app.1991.070430501

Cited by 38 publications

(10 citation statements)

References 6 publications

(5 reference statements)

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“…Recently, Tang et al [42] reported a percolation threshold of surfactant-assisted polyimide/MWCNTs nanocomposites is in range 0.5-1.0 wt % MWCNTs (from 3.08 × 10 9 to 2.98 × 10 6 Ω·cm), and the resistivity can be reduced to 8.02 × 10 4 Ω·cm with loading 3.0 wt % MWCNT. Kumar et al [2] found that the conductivity of PEI could be improved by using MWCNT via a facile solution processing method, and the volume resistivity could be decreased to 10 5 Ω·cm of loading 5.0 wt % MWCNT, which is much higher than the value obtained in this experiment. …”

Section: Electrical Properties Of the Composite Filmscontrasting

confidence: 57%

“…Some drawbacks include extremely low conductivity, atmospheric moisture absorption, and poor fluidity at high temperature, which greatly limits its application. Many efforts to improve its properties by adding carbon nanotubes (CNT) [1][2][3] or graphitic nanoplatelets (GNP) [4] into the matrix, or compositing with other special structure materials such as liquid crystalline polymer (LCP) [5,6] or carbon nanofibers (CNF) have been reported [7,8]. Carbon nanotubes have drawn large attention as "materials of the 21st century" due to their impressive physical and chemical properties since their serendipitous discovery in 1991 [9].…”

Section: Introductionmentioning

confidence: 99%

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Superior Performance Nanocomposites from Uniformly Dispersed Octadecylamine Functionalized Multi-Walled Carbon Nanotubes

Chen

Jing

Ezzeddine

et al. 2015

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Polyetherimide (PEI) is a widely applied as engineering plastic in the electronics, aerospace, and automotive industries but the disadvantages of extremely low conductivity, atmospheric moisture absorption, and poor fluidity at high temperature limits its application. Herein, commercial multi-walled carbon nanotubes (MWCNTs) were modified with a long alkyl chain molecule, octadecylamine (ODA), to produce a uniform dispersion in commercial PEI matrices. Both covalent and noncovalent modification of MWCNTs with ODA, were prepared and compared. Modified MWCNTs were incorporated in PEI matrices to fabricate nanocomposite membranes by a simple casting method. Investigating mechanical properties, thermal stability, and conductivity of the polyetherimide (PEI)/MWCNT composites showed a unique combination of properties, such as high electrical conductivity, high mechanical properties, and high thermal stability at a low content of 1.0 wt % loading of ODA modified MWCNTs. Moreover, electrical resistivity decreased around 10 orders of magnitude with only 0.5 wt % of modified MWCNTs.

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Section: Electrical Properties Of the Composite Filmscontrasting

confidence: 57%

Section: Introductionmentioning

confidence: 99%

Superior Performance Nanocomposites from Uniformly Dispersed Octadecylamine Functionalized Multi-Walled Carbon Nanotubes

Chen

Jing

Ezzeddine

et al. 2015

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“…Some of the most important parameters in influencing fibrillation of LCP in blends include viscosity ratio, shear rate, LCP content, and interfacial properties [1][2][3][4][5][6]. Viscosity ratio of unity or lower is generally reported to be a necessary condition for fibrillation [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Phase Diagram for Predicting In Situ Fibrillation of LCP During Molding

Tan

Yue

et al. 2006

Materials and Manufacturing Processes

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The present work represents an important attempt at constructing a phase diagram for predicting the type and extent of fibrillation of the liquid crystalline polymer (LCP) phase in LCP-based polymer blends. A polycarbonate (PC)/LCP polymer blend was utilized in the current study. The combined effects of three factors, namely, the shear rate, the LCP content in the blend, and interfacial adhesion between the LCP phase and the matrix polymer (PC) were considered. In contrast, work in reported literature has usually considered the individual effect of only one or at most two of these three factors. A thermotropic liquid crystalline polymer, LC5000, consisting of 80/20 of hydroxybenzoic acid and poly(terephthalate) was employed. The effect of interfacial adhesion between the LCP and the PC matrix on fibrillation was considered by using a compatibilizer for the PC/LCP blend. It was demonstrated that the constructed phase diagram could successfully be used to predict and illustrate the conditions under which in situ fibrillation of the LCP phase would occur in the LCP-based blend.

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“…Extensional flow rather than shear flow is preferred for the formation of the fibrillar phase. Additionally, to obtain fibrils of large aspect ratio, a proper concentration of TLCP is compelled together with a proper value of the viscosity ratio between TLCP and thermoplastics [8,9,14,17,18]. Excellent mechanical properties have been achieved for blends of thermoplastics and LCPs when partial miscibility exists and, in some cases, also when they are not miscible or compatible [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

“…Many interesting papers have been published on binary blends of polyetherimides and thermotropic liquid crystalline polymers, where morphology-rheology relationships, conditions to develop TLCP fibrillar morphology and the processability of polyetherimides were studied [17,18,22,[29][30][31]. Very few papers have focused their attention on the possibility to compatibilize the two polymers.…”

Section: Introductionmentioning

confidence: 99%

In situ compatibilization of a polyetherimide and a thermotropic polyester using an epoxy resin

Turturro¹,

Castellano²,

Panzardi³

et al. 2003

E-Polymers

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This study examines the compatibilization of the polyetherimide Ultem 1000 with the thermotropic liquid crystalline polymer Vectra A 950 by using an epoxy resin (PKFE) as compatibilizer. IR spectroscopy and electron-microscopic morphological analysis indicate the grafting of PKFE molecules on fibrillar domains of Vectra during melt mixing. Moreover, morphological analysis shows that the addition of PKFE improves the dispersion and decreases the size of Vectra fibrils. Both Vectra and PKFE significantly reduce the glass transition temperature of Ultem in ternary blends. The tensile modulus and the ultimate strength of the blends are improved with respect to those of neat Ultem. However, the final materials are very fragile. The roles of Vectra and PKFE are discussed.

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Blends of a polyetherimide and a liquid crystalline polymer: Fiber orientation and mechanical properties

Cited by 38 publications

References 6 publications

Superior Performance Nanocomposites from Uniformly Dispersed Octadecylamine Functionalized Multi-Walled Carbon Nanotubes

Superior Performance Nanocomposites from Uniformly Dispersed Octadecylamine Functionalized Multi-Walled Carbon Nanotubes

Phase Diagram for Predicting In Situ Fibrillation of LCP During Molding

In situ compatibilization of a polyetherimide and a thermotropic polyester using an epoxy resin

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