Structural investigation of Poly(ethylene terephthalate)/Poly(trimethylene terephthalate) transesterificated blends |
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Authors: | Maurizio Canetti Maila Castellano |
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Affiliation: | (1) Insitute for the Study of Macromolecules, National Research Council, Via Bassini 15, 20133 Milan, Italy;(2) Departement of Chemistry and Industrial Chemistry, University of Genoa, Via Dodecaneso 31, 16146 Genoa, Italy |
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Abstract: | Wide-Angle X-ray Diffraction (WAXD) and Small-Angle X-ray Scattering analyses were carried out to evaluate the evolution of
the crystalline and supermolecular structure of poly(ethylene terephthalate) (PET) blended with poly(trimethylene terephthalate)
(PTT). The conditions adopted in preparing the PET/PTT 50/50 blend induce transesterification between the polyesters; these
reactions produce a new molecular characteristics based on PET/PTT copolymer that exhibits its own WAXD profile. The PET/PTT
50/50 copolymers prepared by melt mixing of the homopolymers for increasing times evidence spherulitic morphology and an evolution
of the crystalline structure in terms of crystallinity and crystal dimensions. The periodicity of the transesterificated samples
is intermediate between the long periods observed for pure PET and pure PTT. For the PET/PTT 50/50 copolymers the value of
periodicity and lamellar thickness increase with the increasing of the processing time. |
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Keywords: | |
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