Abstract
The segmental orientation behavior of the thermoplastic elastomer [poly(butylene terephthalate-co-tetramethylene oxide)] has been studied with IR dichroism and polarizing microscopy. The orientation of hard segments as well as soft segments has been determined as a function of draw ratio. The difference in the orientation behavior of soft and hard segments has been associated with the respective T g 's. It has been also established that annealing significantly affects the deformation behavior. The segmental orientation has been observed to be strongly affected by the addition of small amount of the asymmetric chain extender
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