Combined Techniques for the Characterization of Linear-Hyperbranched Hybrid Poly(Butylene Adipate) Copolymers (Articolo in rivista)

Type
Label
  • Combined Techniques for the Characterization of Linear-Hyperbranched Hybrid Poly(Butylene Adipate) Copolymers (Articolo in rivista) (literal)
Anno
  • 2011-01-01T00:00:00+01:00 (literal)
Alternative label
  • F.Samperi, S.Battiato, C.Puglisi, A.Scamporrino, V.Ambrogi, L.Ascione, C.Carfagna (2011)
    Combined Techniques for the Characterization of Linear-Hyperbranched Hybrid Poly(Butylene Adipate) Copolymers
    (literal)
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  • F.Samperi, S.Battiato, C.Puglisi, A.Scamporrino, V.Ambrogi, L.Ascione, C.Carfagna (literal)
Pagina inizio
  • 3615 (literal)
Pagina fine
  • 3630 (literal)
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  • 49 (literal)
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  • ImpactFactor=3,971 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Titolo
  • Combined Techniques for the Characterization of Linear-Hyperbranched Hybrid Poly(Butylene Adipate) Copolymers (literal)
Abstract
  • Linear-hyperbranched hybrid poly(butylene adipate) (HPBA) copolymers were synthesized through a branching reaction between the linear tailored prepolymer 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 as catalyst, at 180 C under vacuum for different times. All samples were characterized by NMR and matrix assisted laserdesorption/ionization time of flight mass spectrometry (MALDI-TOF MS). In particular, MALDI-TOF mass spectra of the unfractionated and size exclusion chromatography (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 transesterification and intramolecular and intermolecular transetherification side reactions, respectively, were also revealed by MALDI-TOF MS analysis. All samples were also investigated by SEC. The average molar masses (MMs) evaluated by SEC calibrated with the polystyrene (PS) narrow standards were overestimated with respect to those calculated by the SEC/MALDI-TOF MS selfcalibration method, which gave reliable values. Moreover, it also showed that the hydrodynamic volume of the HPBA polymers was higher than that of the linear PSs with similar MMs. (literal)
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