ISSN:
0272-8397
Keywords:
Chemistry
;
Chemical Engineering
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
A systematic study of thermo-mechanical properties of high speed spun poly(ethylene terephthalate) fibers was undertaken as part of a broad quantitative process - structure - property examination of semicrystalline polymers through appropriate composite models. Calorimetric experiments on a series of fibers spun at different speeds show that crystallinity increases with takeup speed rapidly below 4500 m/min but at a slower rate above that speed. The glass transition, cold crystallization, and melting temperatures were also found to increase with speed. A similar increase is exhibited by both the refractive index of these fibers along the fiber axis and the fiber birefringence. Comparison of birefringence measurements with those predicted from a composite two-phase optical model led to the conclusion that form birefringence may be a significant contributor to the overall birefringence and that it may not be ignored in calculations of orientation functions with this experimental technique.
Additional Material:
11 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pc.750080410
Permalink
