Novel polyurethane networks based on hybrid inorganic/organic phosphazene‐containing nanotubes with surface active hydroxyl groups

Abstract

Recently, our group reported a novel preparation of poly(cyclotriphosphazene‐co‐4,4′‐sulfonyldiphenol) nanotubes (PZSNTs), which could be conveniently prepared in a one‐pot process at room temperature without any surfactant or other compatibilizing agent. PZSNTs were a new kind of phosphazene‐containing crosslinked polymers which attracted considerable interest for their outstanding biocompatibility, thermal stability, and flame‐retardant property. Moreover, PZSNTs which possessed inherent surface active hydroxyl groups could be directly used as a crosslinking agent to prepare polyurethane hybrid networks. PZSNTs were homogeneously dispersed in the polyurethane matrix. Tensile tests indicated that the nanocomposites were significantly reinforced by crosslinking of PZSNTs. The tensile strength was enhanced from 11.4 to 21.5 MPa while the elongation at break was almost invariable (460–430%). The storage moduli of the nanocomposites were significantly higher than that of the pure polyurethane. In terms of thermogravimetric analysis (TGA), the nanocomposites displayed an improved thermal stability. Copyright © 2010 John Wiley & Sons, Ltd.

Development of Prosopis juliflora carbon-reinforced PET bottle waste-based epoxy-blended bio-phenolic benzoxazine composites for advanced applications

“…55,56 According to tan d peak value, the 5 wt% f-PJC/PETEP-CBz composite possesses a higher T g value due the presence of more cross-linking sites of f-PJC reinforcement, which in turn restrict the free motion of the bio-phenolic moiety with substituted long aliphatic side chains and PET epoxy moieties in the blended composites. 57 Further, the width of the tan d peak replicates the structural homogeneity of the cross-linked network; the 5 wt% f-PJC/PETEP-CBz composite shows a broad tan d peak, probably due to a small amount of structural inhomogeneity, which may arise from the reinforcement effect of f-PJC on the PETEP-CBz blended matrix. Therefore, the sheet-like structure as observed from the SEM images restricts the free motion of the polymer matrix and requires higher thermal energy for the occurrence of T g .…”

Design of Poly(cyclotriphosphazene)-Functionalized Zirconium Phosphate Nanoplatelets To Simultaneously Enhance the Dynamic Mechanical and Flame Retardancy Properties of Polyamide 6

“…Cyclotriphosphazene-derivative compounds are an important class of FR because they contain a controllable cyclic structure with alternate −PN– units, resulting in high thermal stability and high limiting oxygen index (LOI) . The varieties of covalently cross-linked cyclotriphosphazenes can be synthesized using a normal precipitation method from hexachlorocyclotriphosphazenes (HCCPs) and low-molecular weight amines, alcohols, and thiol compounds, which are extensively used as adhesives and polymer additives in FRs. − Köhler et al synthesized highly cross-linked cyclomatrix polyphosphazene poly­(HCCP- co -bPEI)­s from HCCP and branched polyethylene imines (bPEI). They confirmed that the amine-terminated poly­(cyclophosphazenes) obtained possess high thermal stability and high adhesion properties, which are more useful as additives in FRs used in polymer coatings.…”

Research Progress in Energy Based on Polyphosphazene Materials in the Past Ten Years

“…Such variety in the physical and chemical properties gives them important application value in many application fields. In the past decades, a large amount of literature have reported the application of linear polyphosphazene in special rubber and elastic materials [ 38 , 39 , 40 , 41 ], fire retardant materials [ 42 , 43 , 44 ], biomedical materials [ 45 , 46 ], nonlinear optical materials [ 47 , 48 ], separation membrane materials [ 49 , 50 ], doped materials [ 51 , 52 , 53 , 54 ], solid polymer electrolytes [ 55 , 56 , 57 , 58 , 59 , 60 , 61 ], proton conducting polymer materials [ 62 , 63 , 64 ], catalyst carriers [ 65 , 66 ], polymer dyes [ 67 ] and other fields.…”

“…However, due to the highly cross-linked chemical structure of the cyclocrosslinked polyphosphonitrile, it is usually an insoluble resin, which is difficult to process. Therefore, at present, the application of cyclocrosslinked polyphosphonitrile is mostly concentrated in the fields of thermosetting resin, adhesives and polymer substrate filling material, which use the high content of phosphorus and nitrogen elements to improve the thermal stability and flame-retardant properties of the polymer matrix [ 42 , 43 , 44 , 45 ].…”