Novel cross-linkable polyphosphazene with o-acetyl phenoxide as the pendant group

Abstract

A new polyphosphazene which bears o-acetylphenoxide group [NP(o-C 6 H 4 -COCH 3 )] n , PAOP was synthesized. PAOP can be efficiently thermally crosslinked at mild condition using p-phthalaldehyde as cross-linker and sodium hydroxide as catalyst both in solution and solid reaction. It was found that solid reaction gives more products with carbon-carbon double bond. The suggested process of cross-linking reaction was described based on the progress of small molecular reaction. Influence factors of cross-linking reaction including water and temperature were also discussed and it was concluded that water prevents crosslinking and higher temperature causes higher percent conversion. The photochemical reaction of cross-linked PAOP was simply studied using UV and it was demonstrated that carbon-carbon double bond decayed under UV irradiation and more complicated products were obtained.

On the biodiversity of diatom communities in lakes of East China: Geochemical effects dominated after eutrophication

“…Mantel test explains the association between distance matrices of biological community and environment variables (Mantel, 1967). The pairwise Mantel tests were calculated between the Bray‐Curtis distance matrix for diatom community and the Euclidean distance matrix for each relevant environmental variable using ‘linET’ (Huang, 2021) and ‘vegan' package. Pearson's correlation coefficients were analysed with 999 permutations between dissimilarity matrices of all tested environmental variables, with p ‐values corrected by BH method.…”

Preparation and Mechanical Properties of Cross-Linked Polyphosphazene Elastomers Based on Urethane Oligomers

“…Besides, Allcock et al have reported an ionically cross-linkable polyphosphazene [12] . Very recently, our group also reported polyphosphazene could be thermally cross-linked using p-phthalaldehyde as cross-linker and sodium hydroxide as catalyst both in solution and solid reaction [13] . However, rarely has it been reported about cross-linking effect on polyphosphazene properties.…”