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In-situ reinforcement of PET monofilaments
Contact: Reiner Giesa, Hans-Werner Schmidt
The SEM micrograph above shows a TLCP blend fiber obtained by blending PET with 10wt% of a special designed TLCP. The LCP phase is visible in long extended fibrills which are responsible for the reinforcing effect.

Poly(ethylene terephthalate) (PET) fibers are employed in industrial applications such as tire cords, composites, belts, and textiles. For these applications an improvement in fiber modulus without sacrificing tenacity accompanied by a minimal increase in manufacturing costs would be readily accepted by industry. One concept of PET fiber reinforcement is the formation of in-situ composites with thermotropic liquid crystalline polyesters (TLCP).
The objective of the work in this research project was the evaluation of a newly developed amorphous TLCP as an in-situ reinforcement component in PET blend fibers. A typical fibrillar microstructure of the TLCP for as-spun fibers was found in SEM (figure left) investigations. The modulus of hot-drawn blend fibers blend showed a modest increase in modulus of about 22 % to 22.6 GPa at 1200 MPa tenacity and a load level 3 wt% was determined.

List of publications

Grasser, W.; Schmidt, H.-W.; Giesa, R.: Thermotropic liquid crystalline copolyesters with non-coplanar biphenylene units tailored for blend fiber processing with PET, Polymer, 42, 8529-8540 (2001)
Grasser, W.; Schmidt, H.-W.; Giesa, R.: Fibers spun from poly(ethylene terephthalate) blended with a thermotropic liquid crystalline copolyester with non-coplanar biphenylene units, Polymer, 42, 8517-8527 (2001)
Giesa, R.; Joslin, S.; Melot, D.; Farris, R.J.: Properties of Fibers Spun from Blends of a Thermotropic Liquid Crystalline Block Copolymer with Poly(ethyleneterephthalate), Polymers & Polymer Composites, 3(5), 333 (1995)
Giesa, R.; Joslin, S.; Farris, R.J.: Thermotropic Liquid Crystalline Polymers with flexible Moieties blended with Poly(ethylene terephthalate), Polymer, 35, 4303 (1994)

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