Characterization and processing of blends of poly(ether imide) with thermotropic liquid crystalline polymer

Lee, Sang-Mook; Hong, Soon Man; Seo, Yongsok; Park, Tae Suk; Hwang, Seung Sang; Kim, Kwang Ung; Lee, Jae Woo

doi:10.1016/0032-3861(94)90506-1

Cited by 67 publications

(35 citation statements)

References 24 publications

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“…This indicates that, especially in air, the TLCP-containing blend is thermally more stable than the neat PP sample. The increase in E a value of the blend when compared to that of the neat matrix is similar to those of poly(ether imide) (PEI)-Vectra B950 blends reported by Lee et al (1994) and SEBS-LC3000 blend reported in our previous communication (Saikrasun and Amornsakchai, 2007). Moreover, E a values of PP and PP-30 in air are much lower than those in nitrogen.…”

Section: Kinetic Analysis Of Thermal Decompositionsupporting

confidence: 83%

Thermal decomposition kinetics of in situ reinforcing composite based on polypropylene and liquid crystalline polymer

Saikrasun

Saengsuwan

2009

Journal of Materials Processing Technology

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Section: Kinetic Analysis Of Thermal Decompositionsupporting

confidence: 83%

Thermal decomposition kinetics of in situ reinforcing composite based on polypropylene and liquid crystalline polymer

Saikrasun

Saengsuwan

2009

Journal of Materials Processing Technology

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“…[13][14][15][16] Addition of Vectra B to Ultem may increase the mechanical properties such as tensile strength and modulus, but the immiscible blend is brittle due to its poor interfacial adhesion. 16 To improve the interfacial adhesion between Vectra B and Ultem, polyesterimide (PEsI) was introduced as a compatibilizer in this paper. PEsI as a compatibilizer enhanced processability and mechnical properties of TLCP/PEI blends as reported in our earlier literature.…”

Section: Derstoodmentioning

confidence: 99%

“…PEsI as a compatibilizer enhanced processability and mechnical properties of TLCP/PEI blends as reported in our earlier literature. [16][17][18] Investigation of relationships between chemical structure and physical properties of Ultem/Vectra B blend containing chemically different PEsI would be necessary to better understand the compatibilizing effects. Two types of PEsI as compatibilizers for Ultem/Vectra B blend system were prepared based on polyethylene terephthalate (PET) and polybutylene terephthalate (PBT) by melt polymerization.…”

Section: Derstoodmentioning

confidence: 99%

“…This may be due to the easy processability of EI10 resulting from lower molecular weight than that of BI10. [16][17][18] Details are under investigation and will be reported in the future.…”

Section: Rheological Propertiesmentioning

confidence: 99%

“…If the viscosities of Ultem and LCP are considered, the value of is less than the order of 0.1 at the processing temperature (330 C), and the equation can be reasonably simplified to 16,18 …”

Section: Morphologymentioning

confidence: 99%

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Effect of Poly(esterimide)s as Compatibilizers on the Physical Properties of Poly(etherimide)/Thermotropic Liquid Crystalline Polymer in-situ Composites

Hong

Gil

Hwang

et al. 2004

Polym J

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ABSTRACT:This study investigates the compatibilizing effect of poly(esterimide) (PEsI) on the blend of poly-(etherimide) (Ultem 1000; Ultem from General Electric Company) and thermotropic liquid crystalline polyesteramide (Vectra B950; Vectra B from Hoechst Celanese). Two types of polyesterimide (PEsI) were prepared as compatibilizers to improve the interfacial adhesion of incompatible Ultem and Vectra B. Poly(ethyleneterephthalate) (PET) based PEsI (EI10) and poly(butyleneterephthalate) (PBT) based PEsI (BI10) including 10 mol% of the imide are prepared. The binary Vectra B/PEsI and Ultem/PEsI blends were investigated in terms of thermal properties. This revealed that EI10 is more reactive (or compatible) with Vectra B, whereas BI10 is more compatible with Ultem. The effect of compatibilizer structures on the ternary Ultem/Vectra B/PEsI blends was also studied by thermal behavior, rheological properties, and mechanical properties. These results showed that BI10, more compatible with Ultem matrix, acts as a better compatibilizer in a ternary Ultem/Vectra B/PEsI blend system than EI10, more compatible with Vectra B phase. The optimum level of the compatibilzers turned out to be about 1-2 wt% for the blend systems.KEY WORDS Polyesterimide / Interfacial Adhesion / Liquid Crystalline Polyesteramide / Polyetherimide / Compatibilizer / In recent years polymer blends in which a thermotropic liquid crystalline polymer (TLCP) dispersed in a thermoplastic matrix, so called the in-situ composite, have frequently been studied to exploit the excellent mechanical properties of the TLCP such as high tensile strength/modulus, low thermal expansion coefficient, low dielectric properties, and low moisture pick-up.1-5 Furthermore, physical properties such as thermomechanical properties, transient viscosity, crystallization behavior, morphology, and rheological properties of TLCP/isotropic polymer blends have been lively investigated. 6,7 TLCP molecules can easily line up during shearing, thereby they reduce the resistance to flow. If a spinning process is performed, moreover, the oriented fibrillar species can be obtained in the solid state due to the long relaxation time of TLCP chains. 5,8,9 In-situ composites can be produced by melt blending of two components in twin screw extruder or static mixer, followed by elongation. TLCP phases are usually deformed into microfibrils along the flow direction, and the matrix can be reinforced. In most cases, however, dispersed TLCP domain and thermoplastic matrix are immiscible. Thus, their in-situ composites show limited mechanical properties resulting from weak interfaces.To obtain enhanced physical properties of the insitu composites, improved compatibility between the matrix polymer and the reinforcing TLCP has been required. [10][11][12] It is well known that the compatibilization is a decisive factor to overcome the problems of poor dispersion and poor interfacial adhesion in the incompatible polymer blends resulting in melt flow instabilities and weak physical properties. To improve ...

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Liquid Crystalline Composite

Isayev

2012

Wiley Encyclopedia of Composites

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A review of novel technologies for manufacturing composites involving liquid crystalline polymers (LCPs) is presented. In particular, this review provides a classification scheme of various types of LCPs, with a special emphasis paid to the history, key approaches, milestones in developments of thermotropic LCPs, and their commercialization. Methods of characterization of LCPs by optical and electron microscopy, X‐ray diffraction, NMR, light scattering, and thermal, rheological, and mechanical techniques are discussed. The development of the concept of self‐reinforced or in situ composites based on blending LCPs with flexible‐chain polymers and LCPs with other LCPs is presented. In these composites, the dispersed fibrous reinforcing LCP species in polymer matrices are not actually present before the processing of the resin, but come into existence during the processing step. Various aspects of manufacturing of these composites are discussed including methods of mixing and compounding, transition temperatures, different factors governing LCP fibrillations, effects of LCP on crystallization of thermoplastic matrices, rheology of composites, and the use of LCP as a processing aid for thermoplastics. Special attention is paid to manufacturing and mechanical properties of the composites based on LCP/thermoplastic, LCP/LCP and ternary blends, and LCP/thermoplastic and LCP/LCP laminates. The effect of compatibilization and anisotropy of composites are also considered along with proposed approaches to reduce their anisotropy. Finally, various existing and future possibilities for industrial applications of self‐reinforced composites are discussed.

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Characterization and processing of blends of poly(ether imide) with thermotropic liquid crystalline polymer

Cited by 67 publications

References 24 publications

Thermal decomposition kinetics of in situ reinforcing composite based on polypropylene and liquid crystalline polymer

Thermal decomposition kinetics of in situ reinforcing composite based on polypropylene and liquid crystalline polymer

Effect of Poly(esterimide)s as Compatibilizers on the Physical Properties of Poly(etherimide)/Thermotropic Liquid Crystalline Polymer in-situ Composites

Liquid Crystalline Composite

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