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Fine Structure Formation and Physical Properties of Poly(butylene terephthalate) Fibers in High Speed Melt Spinning  

Lee Sun Hee (Department of Textile Engineering, Pusan National University)
Cho Hyun Hok (Department of Textile Engineering, Pusan National University)
Publication Information
Textile Science and Engineering / v.41, no.6, 2004 , pp. 400-406 More about this Journal
Abstract
The effect of take-up velocity on the fine structure and properties of PBT fibers are investigated using WAXD, density, birefringence, DSC, dynamic viscoelasticity, TMA, tensile test, etc. An increase in take-up velocity caused an increase in both the density and the birefringence. In the results of WAXD equatorial profiles, the increase in the take-up velocities resulted in the formation of (010) and (100) reflections of $\beta-crystal$ and the reflection peak became sharper at the take-up velocity of 6 km/min. The initial modulus of the fiber increased when the g' fraction increased, the tenacity depended more on fractions of $\alpha-crystal$, i.e. the total crystallinity. The thermal properties of high speed spun PBT fibers were measured with DSC, dynamic viscoelasticity, TMA, etc. Endothermic curves became sharper with increasing take-up velocities, and endothermic melting peaks are shifted to high temperatures. Therefore, crystal structure was well developed in the fiber obtained at high take-up velocities. The $tan\delta$ peak is shifted and the intensity is decreased with temperature. That is, the packing density of the PBT fiber is high when the take-up velocity and orientation of amorphous region is increased. The shrinkage has a tendency to decrease with increasing take-up velocity.
Keywords
PBT fiber; high speed melt spinning; crystal structure;
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