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Poly(ethylene terephthalate)–poly(caprolactone) block copolymer. I. Synthesis, reactive extrusion, and fiber morphology

✍ Scribed by Weiming Tang; N. Sanjeeva Murthy; Frank Mares; Milton E. Mcdonnell; Sean A. Curran

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
239 KB
Volume
74
Category
Article
ISSN
0021-8995

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✦ Synopsis

A novel poly(ethylene terephthalate)-poly(caprolactone) block copolymer (PET-PCL) is synthesized in a reactive twin-screw extrusion process. In the presence of stannous octoate, ring-opening polymerization of ⑀-caprolactone is initiated by the hydroxyl end groups of molten PET to form polycaprolactone blocks. A block copolymer with minimal transesterification is obtained in a twin-screw extruder as a consequence of the fast distributive mixing of ⑀-caprolactone into high melt viscosity PET and the short reaction time. The PET-PCL structure is characterized by IV, GPC, 1 H-NMR, and DSC. Fully drawn and partially relaxed fibers spun from PET-PCL are characterized by WAXD and SAXS. A substantial decrease in the oriented amorphous fraction appears to be the major structural change in the relaxed fiber that provides the fiber with the desired stress-strain characteristics.

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