On the presence of polytetrahydrofuran in the polyspiro-phosphazenes [NP(O2C12H8)]n prepared from [NPCl2]n and 2,2′-dihydroxybiphenyl in THF as solvent
✍ Scribed by Gabino A. Carriedo; Francisco J. Garcia Alonso; Paloma Gomez Elipe; Pedro A. Gonzalez; Carlos Marco; Marian A. Gomez; Gary Ellis
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 176 KB
- Volume
- 77
- Category
- Article
- ISSN
- 0021-8995
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✦ Synopsis
Polydichlorophosphazene [NPCl 2
] n reacts with the diphenol 2,2Ј-(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 ) ⅐ 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 ϩ 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.