Characterization of Copoly(ester-amide)s From Reactive Blending of PET/MXD6 Blends in the Molten State (Contributo in atti di convegno)

Type
Label
  • Characterization of Copoly(ester-amide)s From Reactive Blending of PET/MXD6 Blends in the Molten State (Contributo in atti di convegno) (literal)
Anno
  • 2011-01-01T00:00:00+01:00 (literal)
Alternative label
  • F.Samperi, M.S.Montaudo, S.Battiato, D.Carbone, A.Scamporrino, C.Puglisi (2011)
    Characterization of Copoly(ester-amide)s From Reactive Blending of PET/MXD6 Blends in the Molten State
    in Advances in Polymer based Materials and Related Technologies, Capri -NA
    (literal)
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  • F.Samperi, M.S.Montaudo, S.Battiato, D.Carbone, A.Scamporrino, C.Puglisi (literal)
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  • May 29th - June 1st, 2011. (Conference Proceeding -Poster) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#descrizioneSinteticaDelProdotto
  • Abstract: PET-MXD6 copolymers were prepared by reactive blending of equimolar PET/MXD6 blends at 285 °C for different time in presence of terephthalic acid (1 %w). Firstly, the partial hydrolysis of PET and MXD6 occurs, yielding oligomers terminated with reactive aromatic carboxyl groups. These oligomers quickly react with ester and amide inner groups producing a PET-MXD6 copolymer, that may be compatibilize the initial biphasic blend. In this homogeneous environment, the aliphatic carboxyl-terminated MCD6 chains, inactive in the initial biphasic blend, may promote the exchange reactions determining the formation of a random copolymer at longer reaction time (120 min). The progress of exchange reactions, and the microstructure of the formed copolyeteramides, versus the reaction time, was followed by (1H and 13C)-NMR analyses using a CDCl3/TFA-d/(CF3CO)2O mixture as solvent, and applying appropriate mathematical models. Dyads and triads sequences were thoroughly characterized by NMR. Block copolymers were formed at short reaction time; the average sequence lengths of each block decreases as increase the reaction time and random copolymers were formed at reaction time higher than 75 min. DSC data show that semicrystalline block copolymers were obtained at reaction time lower than 45 min, while the other copolymers are amorphous. All PET-MXD6 copolymers shows a single Tg that changes as a function of the dyads molar composition in the copolymers. The measured Tg values match with those calculated by an proposed modified Fox equation that take into account the weight fraction of the four dyads components the PET-MXD6 copolymers. The composition of the randon copolymers was also investigated by MALDI-TOF MS analysis. PET and MXD6 were also heated with and without TA at the same processing conditions. MALDI-TOF analysis of the heated MXD6 and of the PET-MXD6 copolymers reveals also the formation of cyclopentanone ended chains, owing to the degradative reactions involving the adipic acids end groups. (literal)
Titolo
  • Characterization of Copoly(ester-amide)s From Reactive Blending of PET/MXD6 Blends in the Molten State (literal)
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