References in periodicals archive ?
One of the most spectacular developments in the field of materials engineering and processing is the development of in situ or self-reinforced ultrahigh modulus polymer composites containing oriented thermotropic liquid crystal polymers (TLCP) as the reinforcing phase that is generated during processing for high-performance engineering applications (1), (2).
Direct measurements of [lambda] have not been possible in commercial TLCPs because of their limited thermal stability (22).
The analytical technique most frequently used to map out molecular orientation states in injection-molded TLCPs is two-dimensional wide-angle X-ray scattering (2D-WAXS) in transmission mode (6-8).
Because of the unique role that TLCP plays in the reinforced polymer blends, blending a nanocomposite of high viscosity with TLCP is a feasible method to improve its processability without damaging other properties.
In this study, well-dispersed PA6/clay nanocomposite was used to blend with a commercial TLCP (Vectra A950 from Hoechst Celanese).
The major problem is that most TLCPs seemed to be immiscible with PEI (3), (6), (12-15).
Blending thermotropic liquid crystalline polymers (TLCP) with thermpoplastics permits the design of new high-performance composite materials with high strength and stiffness.
The morophology of TLCPs varies due to the shape and size of the rigid polymer segments, which can be in the form of cyclinders, discs, or other geometric shapes.
Although the former is, in principle, a unique material property, quantitative measurements are extremely rare (14) and nonexistent for commercial TLCPs. The latter parameter is purely phenomenological.
However, the reinforcing effect of in-situ generated TLCP fibrils was far below expectations due to the difficulty in achieving well-developed fibrils and lack of strong adhesion with the matrix resin .
In recent years, the TLCPs have come into using for electric and electronic parts such as connector because they have excellent properties, such as very high strength, a very high modulus, excellent fracture toughness, very low thermal expansion along the flow direction, low dielectric constant, and low flammability.
In situ X-ray scattering studies have also been performed by Burghardt and coworkers to study microstructure during shearing of TLCPs such as PSHQ, DHMS, and Vectra B [3, 5, 9, 26].
Acronyms browser ?
Full browser ?
- TLD Badge