Rheological and physical properties ofin situ composite based on liquid crystalline polymer and poly(ethylene 2,6-naphthalate) blends

Kim, Seong Hun; Hong, Soon Man; Hwang, Seung Sang; Yoo, Hyun Oh

doi:10.1002/(sici)1097-4628(19991205)74:10<2448::aid-app13>3.0.co;2-1

Cited by 14 publications

References 30 publications

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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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Liquid Crystalline Composite

Isayev

2012

Wiley Encyclopedia of Composites

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Polymer blends of poly(ethylene‐2,6‐naphthalate) with polystyrene compatibilized by styrene‐glycidyl methacrylate copolymers. I. Rheology, morphology, and mechanical properties

Huang

Hung

et al. 2002

J of Applied Polymer Sci

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ABSTRACT:The compatibilization of blends of poly(ethylene-2,6-naphthalate) (PEN) with polystyrene (PS), through the styrene-glycidyl methacrylate copolymers (SG) containing various glycidyl methacrylate (GMA) contents, was investigated in this study. SG copolymers are able to react with PEN terminal groups during melt blending, resulting in the formation of desirable SG-g-PEN copolymers in the blend. These in situ formed copolymers tend to reside along the interface preferentially as the result of interfacial reaction and thus function as effective compatibilizers in PEN/PS blends. The compatibilized blends exhibit higher viscosity, finer phase domain, and improved mechanical properties. It is found that the degree of grafting of the in situ formed SG-g-PEN copolymer has to be considered as well. In blends compatibilized with the SG copolymer containing higher GMA content, heavily grafted copolymers would be produced. The length of the styrene segment in these heavily grafted copolymers would be too short to penetrate deep enough into the PS phase to form effective entanglements, resulting in the lower compatibilization efficiency in PEN/PS blends. Consequently, the in situ formation of SGg-PEN copolymers with an optimal degree of grafting is the key to achieving the best performance for the eventually produced PEN/PS blends through SG copolymers. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 87: [967][968][969][970][971][972][973][974][975] 2003

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Miscibility study on blend of thermotropic liquid crystalline polymers and polyester

Park

Kim

2003

J of Applied Polymer Sci

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The miscibility of thermotropic liquid crystalline polymers (TLCPs) and polyester blends was investigated with thermal and morphological analyses, as well as transesterification. TLCPs composed of 80 mol % para-hydroxybenzoate (PHB) and 20 mol % poly(ethylene terephthalate) (PET) or 60 mol % PHB and 40 mol % PET, and polyesters such as PET and poly(ethylene 2,6-naphthalate) (PEN) were melt blended in an internal mixer. DSC analyses were performed to investigate the thermal transition behavior and to obtain thermodynamic parameters. All the blends showed only a single glass-transition temperature, which means they are partially miscible in the molten state. The Flory-Huggins interaction parameter was calculated employing the Nishi-Wang approach, and negative values were obtained except for the P(HB8-ET2)/PEN blends. Transesterification was investigated using 1 H-NMR, and the change of chemical shift compared to pure PET or P(HB-ET)s was observed in the P(HB-ET)/PET blends. An intermediate chemical shift value (4.83 ppm) was observed in the P(HB6-ET4)/PEN blends, which indicates transesterification occurred. The fractured surface morphology of scanning electron micrographs showed that the interfaces between the LC droplets and matrix were not distinct.

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Rheological and physical properties ofin situ composite based on liquid crystalline polymer and poly(ethylene 2,6-naphthalate) blends

Cited by 14 publications

References 30 publications

Liquid Crystalline Composite

Liquid Crystalline Composite

Polymer blends of poly(ethylene‐2,6‐naphthalate) with polystyrene compatibilized by styrene‐glycidyl methacrylate copolymers. I. Rheology, morphology, and mechanical properties

Miscibility study on blend of thermotropic liquid crystalline polymers and polyester

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