Poly(butylene terephthalate-co-5-tert-butyl isophthalate) Copolyesters: Synthesis, Characterization and Properties


Autoria(s): Gómez, Francisco; Quintana, Robert; Martínez de Ilarduya, Antxon; Rudé i Payró, Elisabet; Muñoz-Guerra, Sebastián
Contribuinte(s)

Universitat de Barcelona

Resumo

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.

Identificador

http://hdl.handle.net/2445/46110

Idioma(s)

eng

Publicador

Wiley

Direitos

(c) Wiley, 2005

info:eu-repo/semantics/openAccess

Palavras-Chave #Copolímers #Polièsters #Permeabilitat #Propietats tèrmiques #Propietats mecàniques #Propietats òptiques #Copolymers #Polyesters #Permeability #Thermal properties #Mechanical properties #Optical properties
Tipo

info:eu-repo/semantics/article

info:eu-repo/semantics/submittedVersion