The effect of heat setting on the structure and mechanical properties of poly(ethylene terephthalate) fiber. II. The elastic modulus and its dependence on structure

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Abstract
The effects of temperature, time of heat setting, and rate of cooling on the elastic modulus of free‐and taut‐annealed poly(ethylene terephthalate) (PET) fibers were determined at different time scales using Instron, Rheovibron, and pulse propagation meter. The correlation of the elastic modulus with structure is critically examined in terms of the widely used simple one‐phase and two‐phase models for fiber modulus. It is concluded that these simple models are not universally applicable.