Thermal and mechanical properties of injection molded blends of a liquid crystalline polymer and poly(butylene terephthalate)

1994 ◽  
Vol 34 (17) ◽  
pp. 1346-1353 ◽  
Author(s):  
K. Engberg ◽  
M. Ekblad ◽  
P.-E. Werner ◽  
U. W. Gedde
Keyword(s):  
Mechanical Properties ◽  
Liquid Crystalline Polymer ◽  
Liquid Crystalline ◽  
Crystalline Polymer ◽  
Thermal And Mechanical Properties ◽  
Butylene Terephthalate ◽  
Injection Molded

Mechanical properties of injection-molded binary blends of polyethylene with small additions of a liquid-crystalline polymer

2011 ◽  
Vol 122 (6) ◽  
pp. 3564-3568 ◽  
Author(s):  
Tatjana Ivanova ◽  
Janis Zicans ◽  
Ilze Elksnite ◽  
Martins Kalnins ◽  
Robert Maksimov
Keyword(s):  
Mechanical Properties ◽  
Liquid Crystalline Polymer ◽  
Liquid Crystalline ◽  
Crystalline Polymer ◽  
Binary Blends ◽  
Injection Molded

scholarly journals Fiber Formation and Structural Development of HBA/HNA Thermotropic Liquid Crystalline Polymer in High-Speed Melt Spinning

Polymers ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1134
Author(s):  
Bo Seok Song ◽  
Jun Young Lee ◽  
Sun Hwa Jang ◽  
Wan-Gyu Hahm
Keyword(s):  
Mechanical Properties ◽  
Shear Rate ◽  
High Speed ◽  
Melt Spinning ◽  
Liquid Crystalline Polymer ◽  
Liquid Crystalline ◽  
Crystalline Polymer ◽  
Fiber Formation ◽  
Structural Development ◽  
Thermotropic Liquid Crystalline Polymer

High-speed melt spinning of thermotropic liquid crystalline polymer (TLCP) resin composed of 4-hydroxybenzoic acid (HBA) and 2-hydroxy-6-napthoic acid (HNA) monomers in a molar ratio of 73/27 was conducted to investigate the characteristic structure development of the fibers under industrial spinning conditions, and the obtained as-spun TLCP fibers were analyzed in detail. The tensile strength and modulus of the fibers increased with shear rate in nozzle hole, draft in spin-line and spinning temperature and exhibited the high values of approximately 1.1 and 63 GPa, respectively, comparable to those of industrial as-spun TLCP fibers, at a shear rate of 70,000 s−1 and a draft of 25. X-ray diffraction demonstrated that the mechanical properties of the fibers increased with the crystalline orientation factor (fc) and the fractions of highly oriented crystalline and non-crystalline anisotropic phases. The results of structure analysis indicated that a characteristic skin–core structure developed at high drafts (i.e., spinning velocity) and low spinning temperatures, which contributed to weakening the mechanical properties of the TLCP fibers. It is supposed that this heterogeneous structure in the cross-section of the fibers was induced by differences in the cooling rates of the skin and core of the fiber in the spin-line.

Sign in / Sign up

Export Citation Format

Share Document