Preparation and properties of a novel polytriazole resin

Polytriazole resins toughened by an azide-terminated polyhedral oligomeric silsesquioxane (OADTP)

An azido-terminated polyhedral oligomeric silsesquioxane (POSS) compound, octakis(azidopropyl-3-oxycarbonyl-1-decyl-10-thiopropyl-3-)POSS (OADTP), is synthesized and characterized. POSS-polytriazole (PTA) resins are prepared from an azide, an alkyne monomer, and OADTP. The toughening effect of OADTP on PTA resins is analyzed by impact performance test and electronic microscope characterization, and the thermal performance of resins is measured by thermogravimetric analysis and dynamic mechanical analysis. The results show that the addition of the POSS can improve the mechanical properties of PTA resins. The impact strength of POSS-PTA resins first increases and then decreases with the increase in the POSS compound, and the maximum one arrives at 54.8 kJ m−2 which increases by 44.2% as compared to 38 kJ m−2 of the PTA resin. A good thermal stability remains in POSS-PTA resins.

High impact polytriazole resins for advanced composites

Three azido-terminated poly(ethylene glycol) macromonomers (ATPEGs) were synthesized from poly(ethylene glycol)s (PEGs) and characterized. The extended polytriazole (EPTA) resins were prepared from the macromonomers, azide and alkyne monomers. Toughening effect of PEGs on polytriazole resins was analyzed by means of mechanical, thermal and electronic microscope characterization. The results show that molecular weight and content of ATPEGs have great influence on the thermal and mechanical properties of cured EPTA resins. The impact strength of cured EPTA resins increases with the increase of the amount and molecular weight of ATPEGs. The flexural strength and heat resistance of cured EPTA resins decrease with the increase of addition amount and molecular weight of ATPEGs. High impact EPTA resins were obtained.

Novolac-based poly(1,2,3-triazolium)s with good ionic conductivity and enhanced CO2 permeation

Novolac-based poly(1,2,3-triazoliums)s with 1,2,3-triazolium in the side groups spaced by oligo(ethylene glycol) show enhanced CO₂ permeability.

A class of polytriazole metallogels via CuAAC polymerization: preparation and properties

Coordination-driven polytriazole metallogels possess good self-healing abilities.

A new high performance novolac-based polytriazole resin

A novolac-based polytriazole (NPTA) resin was synthesized using 4,4′-diazidomethylbiphenyl and a propargylated novolac resin through catalyst-free click polymerization. Differential scanning calorimetry and Fourier transform infrared analysis results demonstrate that the NPTA resin can be cured at 80°C. The glass transition temperature of the cured NPTA-88 resin is 202°C. The thermal degradation temperature of the cured NPTA resin is 352°C under nitrogen. The composite of the resin exhibits good mechanical property.

The thermal properties and cure kinetics of polytriazole resin modified by 4,4′-bis(azidomethyl) biphenyl

4,4′-Bis(azidomethyl)biphenyl (BAMBP) was employed to modify the polytriazole resin. The thermal properties and cure kinetics of the modified polytriazole resin were investigated using differential scanning calorimetry, dynamic mechanical analysis, and thermogravimetric analysis. Results indicate that BAMBP can promote the curing reaction and decrease the curing reaction temperature but cannot change the cure reaction mechanism. The highest glass transition temperature of modified polytriazole resin can be obtained with 5 wt% BAMBP at 213.2°C. Furthermore, the excellent solubility characteristics of BAMBP in polytriazole allows for fabricating T700 carbon fiber/polytriazole composites, which makes polytriazole one of the candidate resins cured at a lower temperature but used at a higher temperature.

Click-based porous inorganic–organic hybrid material (PHM) containing cyclophosphazene unit and their application in carbon dioxide capture

A high surface area porous hybrid material was synthesized by one-step click chemistry, which captures 1.83 mmol g⁻¹ CO₂ at 273 K.

1,4:3,6-Dianhydrohexitols: Original platform for the design of biobased polymers using robust, efficient, and orthogonal chemistry

1,4:3,6-Dianhydrohexitols (DAHs) are nontoxic and sustainable diols that have been extensively applied as monomers for the preparation of polymer materials by step-growth polymerization processes. The presence of two reactive alcohol groups was exploited to design a library of symmetric and asymmetric stereocontrolled alkyne- and/or azide-functionalized AA/BB and AB monomers suitable for thermal or copper(I)-catalyzed azide-alkyne cycloaddition (TAAC and CuAAC). Step-growth polymerization of these monomers yielded a series of linear polytriazoles as well as partially biosourced networks using a combination of AB + A2B2 derivatives. Characterization of the resulting materials allowed for the establishment of a thorough structure–property relationship emphasizing the impact of monomer stereochemistry and cycloaddition regioselectivity on materials properties.

Investigation of Structure/property Relationships of Polytriazoles

Five polytriazole resins, TAMTMB-BPF, TAMTMB-BPA, TAMTMB-BPK, TAMTMB-BPE, and TAMTMB-BPR, were prepared from 1,3,5-tris(azidomethyl)-2,4,6-trimethylbenzene (TAMTMB) and dipropargyl ethers of hexafluorobisphenol A (BPF), bisphenol A (BPA), 4,4'-dihydroxybenzophenone (BPK), 4,4'-dihydroxydiphenyl ether (BPE), and resorcinol (BPR), respectively. The resins were characterized by Fourier transform infrared spectrometry, differential scanning calorimetry, dynamic mechanical analysis, and thermogravimetric analysis. The results illustrate that the structures of dipropargyl ethers had no obvious effect on the curing behavior of the polytriazole resins and the thermal stability of the cured resins. The polytriazole resins could be cured at 80 °C and further post-cured at higher temperature. The cured resins had a thermal decomposition temperature Td5 near 360 °C. However, the structural units of the polytriazole resins influenced the glass transition temperature T g, dielectric properties, and mechanical properties of the cured resins to some extent. The cured TAMTMB-BPF resin had the highest Tg (226 °C) and best dielectric properties among the resins, whereas the cured TAMTMB-BPR resin showed the highest flexural strength of 200.6 MPa.