Project Details Structure and properties of polyester elastomers composed of poly(butyleneterephthalate) and poly(e-caprolactone)

Project No.:
Start Date:
01 January 2003
End Date:
23 April 2007
Division Name:
Polymer Division
Division No.:


To evaluate the relationship among the chemical structure, the higher-order structure, and the mechanical and rheological properties of the elastomers.


The idea of thermoplastic elastomers brought a big innovation to the rubber industry as well as the field of the polymer science. The rubber materials, which have no need of vulcanization and are easy to be recycled, have attracted the technological and academic interests for these years. The mechanical performance of the thermoplastic elastomers is strongly affected by the higher-order structure of hard segments of the chains. The domain is a glassy amorphous phase or a crystalline phase. Among the several types of thermoplastic elastomers, the polyester-type elastomers are specifically interesting because the characteristics cover from rubber to plastics, in some cases to engineering plastics, according to the structure of crystalline domain of hard segments. The aim of this project is to make clear the structure-properties relation of polyester-type elastomers categorized in engineering elastomers, composed of poly(butyleneterephthalate) as the hard segment and poly(e-caprolactone) or poly(tetramethyleneglycol) as the soft segment.


A paper titled ‘Studies On Uniaxial Tensile Behaviour of Poly(EsterEster) Thermoplastic Elastomers’ has been submitted for publicationin Macromolecules – An Indian Journal (2007) [reftba]
Tensile properties of poly(ester ester) elastomerswith different content of hard segments were investigated. The tensiletests were performed in the temperature range of 313 to 453 K. Theelastomers having a higher content of the hard segments show a higherYoung’s modulus because the hard segments are crystallizedto form a hard domain which acts as crosslinks. The number densityof the crystalline domains decreased with increasing temperature.There is no marked difference in the activation energy to form thecrystalline domains between samples with different contents of hardsegments.

Project completed

<project announcement publishedin Chem.Int.25(2), 2003>