Ester-functionalised poly(1-vinylpyrrolidin-2-one) (PVP) oligomers obtained by radical polymerisation in methyl propionate, diethyl malonate and diethyl 2-methyl-malonate were chracterised by NMR spectroscopy, and MALDI-TOF mass spectrometry. The chain-transfer constants were determined as 5.54 × 10-4, 1.22 × 10-3 and 1.70 × 10-2, respectively, by measuring the variation of the number-average molecular weight on conversion. These values were compared with those of methyl isobutyrate (1.65 × 10-3) and ethyl lactate (1.03 × 10-2), which had been previously determined. A clear dependence was found on the reactivity of the mobile hydrogen atoms α with the ester group. All of the macromolecules carried a single ester function. Therefore, the re-initiation step by the CTA-derived radicals overwhelmingly prevailed over initiation by the primary radicals.
NMR Spectroscopy and MALDI-TOF MS Characterisation of end-functionalise PVP Oligomers Prepared with Different esters as chain transfer agents / E. Ranucci, P. Ferruti, R. Annunziata, I. Gerges, G. Spinelli. - In: MACROMOLECULAR BIOSCIENCE. - ISSN 1616-5187. - 6:3(2006), pp. 216-227.
|Titolo:||NMR Spectroscopy and MALDI-TOF MS Characterisation of end-functionalise PVP Oligomers Prepared with Different esters as chain transfer agents|
RANUCCI, ELISABETTA (Primo)
FERRUTI, PAOLO (Secondo)
GERGES, IRINI (Penultimo)
|Parole Chiave:||1D and 2D NMR spectroscopy; Chain-transfer radical polymerization; Functionalization of polymers; Hydrophilic polymers; PVP functional oligomers|
|Settore Scientifico Disciplinare:||Settore CHIM/06 - Chimica Organica|
|Data di pubblicazione:||2006|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1002/mabi.200500225|
|Appare nelle tipologie:||01 - Articolo su periodico|