Advances in Polymer based Materials and Related Technologies (Contributo in atti di convegno)

Type
Label
  • Advances in Polymer based Materials and Related Technologies (Contributo in atti di convegno) (literal)
Anno
  • 2011-01-01T00:00:00+01:00 (literal)
Alternative label
  • C.Puglisi, S.Battiato, D.Carbone, A.Scamporrino, F.Samperi (2011)
    Advances in Polymer based Materials and Related Technologies
    in Advances in Polymer based Materials and Related Technologies, Capri -NA
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • C.Puglisi, S.Battiato, D.Carbone, A.Scamporrino, F.Samperi (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#note
  • May 29th - June 1st, 2011 Conference Proceeding -Oral (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#descrizioneSinteticaDelProdotto
  • Abstract: The molar composition of the copolymers produced during the melt mixing of equimolar PC/PEN blend, in presence of Ti(OBu)4 (0.5%w) as a catalyst, was monitored as a function of the reaction time by 1H-NMR. 1H-NMR spectra show a series of new signals with respect to the initial homopolymers, indicating the formation of copolymers. They show also that the intensity of methylene (-CH2-)protons decreass with respect that of the aromatic protons of the naphthalate units, as increases the reaction time, indicating the elimination of ethylene carbonate (ETC), as well as in the PC/PET blend melt mixed in the similar conditions. The exchange reactions were monitored by 13C-NMR following the intensity changes of signals corresponding to the -CH2- (62-68 ppm) and to the BPA (114-121 ppm). Applying an appropriate statistical model and using the intensities of these signals we have calculated the molar fractions of each copolymer component. We have found that after 2 min reactive blending the copolymer is essentially constituted of the expected four-component. With the progress of the reaction which occurring, this become a five- components from 5 min up to 10 min, and then become a six component after 15 min up to 45 min. After this time the sequences containing carbonate units disappear owing the elimination of CO2 and ETC, and a four-component copolymer is formed. The elimination of carbonate units was also followed looking the carbon signals due to the corresponding carbonyl that resonate between 153 and 155 ppm and was also confirmed by FT-IR analysis. The weight loss of ETC and CO2 was calculated from NMR data, ando also by isothermal TGA analysis at 280 °C. The DSC data show that the TG of the copolymers changes as a function of their composition and we have proposed and equation to predict this characteristic. (literal)
Titolo
  • Advances in Polymer based Materials and Related Technologies (literal)
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