Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/46684
Title: Crystallization and properties of poly(ethylene terephtalate) copolymers containing 5-tert-butyl isophtalic units
Author: Kint, Darwin, P. R.
Rudé i Payró, Elisabet
Llorens Llacuna, Joan
Muñoz-Guerra, Sebastián
Keywords: Cristal·lització
Estructura cristal·lina (Sòlids)
Propietats mecàniques
Permeabilitat
Tereftalat de polietilè
Crystallization
Layer structure (Solids)
Mechanical properties
Permeability
Polyethylene terephthalate
Issue Date: 2002
Publisher: Elsevier B.V.
Abstract: The influence of incorporating 5-tert-butyl isophthalic units (tBI) in the polymer chain of poly(ethylene terephthalate) (PET) on the crystallization behavior, crystal structure, and tensile and gas transport properties of this polyester was evaluated. Random poly(ethyleneterephthalate-co-5-tert-butyl isophthalate) copolyesters (PETtBI) containing between 5 and 40 mol% of tBI units were examined. Isothermal crystallization studies were performed on amorphous glassy films at 120 8C and on molten samples at 200 8C by means of differential scanning calorimetry. Furthermore, the non-isothermal crystallization behavior of the copolyesters was investigated. It was observed that both crystallinity and crystallization rate of the PETtBI copolyesters tend to decrease largely with the comonomeric content, except for the copolymer containing 5 mol% of tBI units, which crystallized faster than PET. Fiber X-ray diffraction patterns of the semicrystalline PETtBI copolyesters proved that they adopt the same triclinic crystal structure as PET with the comonomeric units being excluded from the crystalline phase. Although PETtBI copolyesters became brittle for higher contents in tBI, the tensile modulus and strength of PET were barely affected by copolymerization. The ncorporation of tBI units slightly increased the permeability of PET, but copolymers containing up to 20 mol% of the comonomeric units were still able to present barrier properties.
Note: Versió postprint del document publicat a: http://dx.doi.org/10.1016/S0032-3861(02)00715-2
It is part of: Polymer, 2002, vol. 43, num. 26, p. 7529-7537
Related resource: http://dx.doi.org/10.1016/S0032-3861(02)00715-2
URI: http://hdl.handle.net/2445/46684
ISSN: 0032-3861
Appears in Collections:Articles publicats en revistes (Enginyeria Química i Química Analítica)

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