Blends of a chlorinated poly(vinyl chloride) compound and a thermotropic liquid crystalline copolyester: Mechanical properties of squeezed flow films

Lee, Biing-Lin

doi:10.1002/pen.760321508

Cited by 4 publications

(1 citation statement)

References 48 publications

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“…The Al/Ar-TLCP p(ET/HBA) can also interact with wholly Ar-TLCP's with carbonyl-oxygen bonds (58,59,74,75,80,81). An Al/Ar-TLCP copolymer containing p(ET/ HBA) has also been blended with epoxies (821, chlorinated poly(viny1 chloride) (CPVC) (83,84), nylons (63,64), polyetherimide (PEI) (85). polyethersulfone (PES) (5) and polyphenylenesulfide (PPS) (64,86,87).…”

Section: Polymer Blends Containing Tlcpsmentioning

confidence: 99%

The effect of block structure of an ethylene terephthalate/hydroxybenzoate copolymer on its ability to form compatible blends

Stachowski

Dibenedetto

1997

Polymer Engineering & Sci

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A thermotropic liquid crystalline polymer (TLCP) containing aliphatic linkages exhibits properties of both a random‐coil and a rigid‐rod. By varying its block structure, one can change its ability to form compatible blends with other polymers. In this work, the ability of the TLCP p(ET/HBA60) with a high degree of block structure, X‐7GTM, to form compatible blends with polycarbonate and aromatic TLCPs is compared to that of a p(ET/HBA60) with a more random molecular structure, RodrunTM LC‐3000. It was found that both materials formed compatible blends through transesterification of the block structure and that a higher degree of blockiness enhanced the rate of transesterification. NMR spectra and differential thermal analysis were used to quantify the degree of transesterification and scanning electron microscopy was utilized to examine the effects of the blending process on the degree of compatibilization and the morphology of the resulting blends.

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Section: Polymer Blends Containing Tlcpsmentioning

confidence: 99%

The effect of block structure of an ethylene terephthalate/hydroxybenzoate copolymer on its ability to form compatible blends

Stachowski

Dibenedetto

1997

Polymer Engineering & Sci

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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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Thermal and mechanical properties of injection molded liquid crystalline polymer/amorphous polymer blends

Engberg

Strömberg

Martinsson

et al. 1994

Polymer Engineering & Sci

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Injection molded samples of binary blends of Vectra (LCP) and the three amorphous polymers polyethersulfone (PES), polycarbonate (PC), and aromatic poly(ester carbonate) (APEC) have been subjected to morphological and rheological characterization, and coefficients of linear thermal expansion and Young's moduli have been determined. The Young's modulus of the PES/LCP blends exhibited a near lower‐bound behavior that could be predicted by the one‐adjustable‐parameter equations of Halpin‐Tsai (ζ = 0.18) and Takayanaga (b = 0.23), whereas the coefficients of linear thermal expansion followed the Takayanaga equation with a value of b = 0.50. The chain orientation of the LCP component was essentially constant in all PES/LCP blends with a Herman's orientation parameter of 0.39 ± 0.03. Transesterification reactions led to randomization of the constituents of the PC/LCP and APEC/LCP blends. The effect was more pronounced in the PC/LCP blends. The introduction of the LCP into the PC/LCP blends led to no reduction in melt viscosity and no self‐reinforcement. APEC/LCP exhibited self‐reinforcement in blends with a content greater than 27 vol% LCP, and especially the blend with 67 vol% LCP. The self‐reinforcement was caused by the presence of an oriented LCP phase, confirmed by X‐ray diffraction, and by improved interfacial bonding, presumably resulting from the transesterification reactions occurring at the phase boundaries.

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Blends of a chlorinated poly(vinyl chloride) compound and a thermotropic liquid crystalline copolyester: Mechanical properties of squeezed flow films

Cited by 4 publications

References 48 publications

The effect of block structure of an ethylene terephthalate/hydroxybenzoate copolymer on its ability to form compatible blends

The effect of block structure of an ethylene terephthalate/hydroxybenzoate copolymer on its ability to form compatible blends

Liquid Crystalline Composite

Thermal and mechanical properties of injection molded liquid crystalline polymer/amorphous polymer blends

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