Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Nylon 3 synthesized by ring opening polymerization with a metal-free catalyst
Δημιουργός/Συγγραφέας:	Yang, Hongjun Zhao, Junpeng Yan, Manqing [EL] Πίσπας, Στέργιος[EN] Pispas, Stergios Zhang, Guangzhao
Εκδότης:	Royal Society Chemistry
Τόπος έκδοσης:	Cambridge
Ημερομηνία:	2011
Γλώσσα:	Αγγλικά
ISSN:	1759-9954
DOI:	10.1039/c1py00334h
Περίληψη:	We have synthesized nylon 3 via ring opening polymerization of 2-azetidinone (beta-lactam) with 1-tert-butyl-4,4,4-tris(dimethylamino)-2,2-bis[tris(dimethylamino)-phosphoranylidenamino]-2 Lambda 5,4 Lambda 5catenadi(phosphazene) (t-BuP(4)) as the catalyst in a mixture of dimethylacetamide (DMAc) and LiCl. The polymers have been characterized by nuclear magnetic resonance spectroscopy (NMR), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), laser light scattering (LLS) and viscometry. The synthesized nylon 3 is a linear and crystalline polymer with a molecular weight as high as 10(5) g mol(-1). The intrinsic viscosity ([eta]) relates to the weight average molecular weight (M(w)) as [eta] = 1.02 x 10(-4) M(w)(0.91). The effects of solvent, temperature and catalyst concentration on the polymerization have been examined. The molecular weight and yield increases with the amount of LiCl in the polymerization mixture, but both of them decrease with temperature at a temperature above 50 degrees C. As the catalyst concentration increases, the yield and the molecular weight of nylon 3 decrease. The possible mechanism for the initiation of polymerization is discussed.
Τίτλος πηγής δημοσίευσης:	Polymer Chemistry
Τόμος/Κεφάλαιο:	2
Τεύχος:	12
Σελίδες:	2888-2892
Λέξεις-Κλειδιά:	Polymer Science
Αξιολόγηση από ομότιμους (peer reviewed):	Ναι
Κάτοχος πνευματικών δικαιωμάτων:	© ROYAL SOC CHEMISTRY
Εμφανίζεται στις συλλογές:	Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο