Physical and mechanical properties of flexible polybenzoxazine resins: Effect of aliphatic diamine chain length

Abstract

A series of linear aliphatic diamine-based benzoxazine monomers has been polymerized into transparent, crosslinked specimens that are free of voids and have good mechanical integrity. The density of these polybenzoxazines is measured as a function of the amine chain length. Dynamic mechanical analysis of these linear aliphatic polybenzoxazines shows two, chain length dependent transitions. Properties, such as room temperature modulus, glass transition temperature, crosslink density, thermal degradation temperature, and char yield, of the polybenzoxazines are investigated as a function of the chain length. All these properties exhibit strong dependence on the chain length. These aliphatic amine-based polybenzoxazines are found to be much more flexible than the bisphenol-type polybenzoxazines.

Integrating plant oils into thermally curable main-chain benzoxazine polymers via ADMET polymerization

“…polyurethane [10,11] and polysiloxane [12]) into its thermosetting matrix to form a phase-separated morphology. Alternatively, the design of inherently tough polybenzoxazines by preparing benzoxazine monomers [13][14][15] or preferably prepolymers containing flexible segments has also been proposed. Thus, developing thermally curable polymeric precursors with benzoxazine units either as side chain [16] or as chain-end [17][18][19][20] or in main chain [21][22][23][24][25][26][27][28][29] some properties that are the combination of thermoplastic and thermosetting polymers such as processability, flexibility, high crosslinking density after cure, reductions in the vapor pressure during process and fragility for cured-structures are transferred to the cured resin.…”

“…6 ). 13 C NMR (CDCl 3 , δ ppm): 144.6 (CS), 138.9 (CCH 3 ), 133.1 (CH=CH 2 ), 129.7 (CH meta to S), 127.7 (CH ortho to S), 114.1 (CH=CH 2 ), 70.6 (CH 2 S), 33.7 (CH 2 CH=CH 2 ), 29.2-28.7 ((CH 2 ) 6 ), 25.2 (OCH 2 CH 2 CH 2 ), 21.5 (CH 3 ).…”

H-bonding supramolecular interactions driving the dispersion of kaolin into benzoxazine: A tool for the reinforcement of polybenzoxazines thermal and thermo-mechanical properties

“…EDBZ monomer was prepared as previously described [27,28] from phenol, paraformaldehyde and ethylenediamine. Typically, 10 g (0.106 mol) of phenol and 6.77 g (0.213 mol) of paraformaldehyde were solubilized in CHCl 3 up to complete dissolution of both constituents.…”

Development and application of novel ring‐opening polymerizations to functional networked polymers

“…11 Thanking to the structural diversity of these starting materials, a wide range of benzoxazine-type monomers involving curable multifunctional ones and intriguing structures have been developed. [12][13][14][15][16][17][18][19][20][21][22] In Scheme 1, the synthesis of a bifunctional benzoxazine from bisphenol-A and aniline and its polymerization are shown as typical examples. The resulting main chain has phenolic moiety bridged by Mannich-type linkage (ACH 2 ANRACH 2 A).…”