Combined techniques for the characterization of linear hyperbranched hybrid PBA copolymers (Contributo in atti di convegno)

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  • Combined techniques for the characterization of linear hyperbranched hybrid PBA copolymers (Contributo in atti di convegno) (literal)
Anno
  • 2011-01-01T00:00:00+01:00 (literal)
Alternative label
  • L.Ascione, V.Ambrogi, C.Carfagna, S.Battiato, C.Puglisi, A.Scamporrino, F.Samperi (2011)
    Combined techniques for the characterization of linear hyperbranched hybrid PBA copolymers
    in XX Convegno Italiano di Scienza e Tecnologia delle Macromolecole (AIM), TERNI
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • L.Ascione, V.Ambrogi, C.Carfagna, S.Battiato, C.Puglisi, A.Scamporrino, F.Samperi (literal)
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  • 4 - 8 Settembre 2011 , (2011) (Conference Proceeding -Oral) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#descrizioneSinteticaDelProdotto
  • Abstract: Linear-hyperbranched hybrid poly(butylene adipate) copolymers (HPBA)s were synthesized through a branching reaction between the linear tailored pre-polymer terminated with methyl ester groups and different mol percents of the 1,1,1-tris(hydroxymethyl) propane (TMP) as branching agent, using the titanium(IV) isopropoxide (TIP) as catalyst, at 180 °C under vacuum for different time. All samples were characterized by NMR and MALDI-TOF Mass Spectrometry (MALDI-TOF MS). In particular, MALDI-TOF mass spectra of the unfractionated and SEC-fractionated hyperbranched (HB) samples gave information on their composition, on the end groups as well as on the TMP units present in each family of HB macromolecules. HB chains containing cyclic branches and ether bonds formed by intermolecular trans-esterification and (intra and inter)-molecular trans-etherification side reactions, respectively, were also revealed by MALDI-TOF MS analysis. All samples were also investigated by size exclusion chromatography (SEC) and differential scanning calorimeter (DSC) tools. The average molar masses (MM) evaluated by SEC calibrated with the polystyrene (PS) narrow standards were overestimated with respect to those calculated by the SEC/MALDI-TOF MS self-calibration method, which gave reliable values. Moreover, it also showed that the hydrodynamic volume of the HPBA polymers was higher than that of the linear (PS)s with similar MM. DSC data showed that all (HPBA)s exhibited a glass transition (Tg) in the temperature range of linear poly(butylene adipate) (PBA) (-56 °C) and two melting points (Tm), whose values were dependent on the TMP content and the reaction time. (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Università Napoli; CNR (literal)
Titolo
  • Combined techniques for the characterization of linear hyperbranched hybrid PBA copolymers (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#isbn
  • 978-88-95028-83-5 (literal)
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