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On the presence of polytetrahydrofuran in the polyspiro‐phosphazenes [NP(O 2 C 12 H 8 )] n prepared from [NPCl 2 ] n and 2,2′‐dihydroxybiphenyl in THF as solvent
Author(s) -
Carriedo Gabino A.,
Garcia Alonso Francisco J.,
Gomez Elipe Paloma,
Gonzalez Pedro A.,
Marco Carlos,
Gomez Marian A.,
Ellis Gary
Publication year - 2000
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(20000718)77:3<568::aid-app12>3.0.co;2-1
Subject(s) - polyphosphazene , polymer chemistry , polymerization , solvent , polymer , copolymer , ring opening polymerization , chemistry , materials science , organic chemistry
Polydichlorophosphazene [NPCl 2 ] n reacts with the diphenol 2,2′‐(HO)C 6 H 4 ‐C 6 H 4 (OH) in THF in the presence of K 2 CO 3 to give the polymers [NP(O 2 C 12 H 8 ) · x (OC 4 H 8 )] n (1) that contain variable ammouts of polytetrahydrofuran (PTHF) with x ranging from 0.05 to 0.8. This PTHF content ( x ) depends on the method followed to prepare the THF solutions of [NPCl 2 ] n used for the reactions with the biphenol and can be made negligibly small, forming these solutions in the presence of K 2 CO 3 . This reveals the presence in the [NPCl 2 ] n of acidic species capable of catalyzing the ring opening polymerization of THF. Polyphosphazene [NP(O 2 C 12 H 8 )] n (2) was prepared completely free of PTHF using dioxane as solvent. A comparison of the thermal behavior and morphological data of the polymers 1, 2, PTHF (5), and mixtures of [NP(O 2 C 12 H 8 )] n + x (OC 4 H 8 ) m (4) revealed that the products 1 are strongly interacting polymer blends and ruled out the possibility of block copolymers. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 77: 568–576, 2000