Pegylated Polybenzoxazine Networks with Increased Thermal Stability from Miscible Blends of Tosylated Poly(ethylene glycol) and a Benzoxazine Monomer

Abstract

The solubility, polymerization, and the macromolecular structure of cured blends of BPA-based benzoxazine (BA-a) in end-group tosylated poly­(ethylene glycol) (mPEGOTs) are studied and compared to analogues from hydroxyl-terminated poly­(ethylene glycol). BA-a can be homogeneously dispersed in both polymers where a wide loading range of ∼100–40 wt % BA-a is possible. The cure temperature for blended BA-a/mPEGOTs was up to 50 °C less than that of pure BA-a or mPEGOH blends. It is proposed that nucleophilic attack of BA-a on the end-group of mPEGOTs produces free tosylate and cationic BA-a-based initiators that act as cure catalystswhere the former was detected by TGA-FTIR and TGA-MS. H-NMR and FTIR revealed the polybenzoxazine (PBA-a) synthesized in mPEGOTs consists of a phenolic rich molecular structure with H-bonded hydroxyl residues and grafted PEG-chains. SEM confirmed that this material, P­(BA-a)-graft-mPEGOTs, has a homogeneous microstructure. The glass transition and the thermal stability of the P­(BA-a)-graft-mPEGOTs can be tuned based on the blend composition.

Low melting point, high thermal stable branched benzoxazines resin derived from mixed-substituted phosphazene core

“…Ma 1,2 , J-J. Qiu 1 , C-M. Liu 1* have been studied [30][31][32][33][34]. However, most benzoxazine resins appear as high melting point powders, and organic solvents [35] are always needed when preparing benzoxazine composites.…”

Effects of networks composed of epoxy/dual thiol‐curing agents on properties of shape memory polymers

“…The result may be attributed to decrease of the crosslinking degree and stability of the entire grid structure caused by TMP with asymmetric structure. Compared with to PMP molecule structure, TMP is more likely to produce structural deformation due to its nature defects (as shown in Figure 6), while PMP/epoxy network can resist large external force since it has a relatively stable structure 29,32 …”

Oligomeric phthalonitriles and tetrakis(phenylethynyl)benzene blends with improved processing and thermal properties

“…A TA Instruments Q500 TGA instrument equipped with an in‐line Thermo Scientific iS10 Fourier transform infrared (FTIR) gas cell spectrometer was used for TGA/TGA‐FTIR experiments. The conditions used for the TGA‐FTIR study were the same as previously reported …”

“…The RES resin was obtained from Chromak and used without further purification. IR (cm −1 ): λ 3064 (sp 2 CH), 2230 (CN), 1645 (CO), 1587 (CC), 1477 (aromatic), 1261 (aromatic), 1161 (CO), 926 (CO), 836 (aromatic) …”