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Title: Poly(butylene terephthalate-co-5-tert-butyl isophthalate) Copolyesters: Synthesis, Characterization and Properties
Author: Gómez, Francisco
Quintana, Robert
Martínez de Ilarduya, Antxon
Rudé i Payró, Elisabet
Muñoz-Guerra, Sebastián
Keywords: Copolímers
Propietats tèrmiques
Propietats mecàniques
Propietats òptiques
Thermal properties
Mechanical properties
Optical properties
Issue Date: 2005
Publisher: Wiley
Abstract: A series of poly(butylene terephthalate) copolyesters containing 5-tert-butyl isophthalate units up to 50%-mole, as well as the homopolyester entirely made of these units, were prepared by polycondensation from the melt. The microstructure of the copolymers was determined by NMR to be at random for the whole range of compositions. The effect exerted by the 5-tert-butyl isophthalate units on thermal, tensile and gas transport properties was evaluated. Both Tm and crystallinity as well as the mechanical moduli were found to decrease steadily with copolymerization whereas Tg increased and the polyesters became more brittle. Permeability and solubility sligthly increased also with the content in substituted units whereas the diffusion coefficient remained practically constant. For the homopolyester poly(5-tert-butyl isophthalate), all these properties were found to deviate significantly from the general trend displayed by copolyesters suggesting that a different chain mode of packing in the amorphous phase is likely adopted in this case.
Note: Versió preprint del document publicat a:
It is part of: Journal of Polymer Science Part A: Polymer Chemistry, 2005, vol. 43, num. 1, p. 92-100
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ISSN: 0887-624X
Appears in Collections:Articles publicats en revistes (Enginyeria Química i Química Analítica)

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