1,3,4 Triazole crosslink

A triazole crosslinked polymer can be formed by the cycloaddition of an azide end-capped polymer with dipolarophile acetylenic curing agent [31]. 

Min BS, Park YC, Yoo JC. A study on the triazole crosslinked polymeric binder based on glycidyl azide polymer and dipolarophile curing agents. Propell Explos Pyrot 2012(1) 59-68. 

Triazole crosslinked polymers are highly effective as improved... 

D. Ciaramitaro, Triazole crosslinked polymers in recyclable energetic compositions and method of preparing die same, US Patent 6 872 266, assigned to The United States of America as represented by the Secretary of the Navy (Washington, DC), March 29,2005. 

The synthesis and properties of chelate resins containing l,2,3-triazole-4,5-dicarboxylic acid as an anchor group have been described. The 2-vinyltriazole (431) was copolymerized with divinylbenzene to yield crosslinked products and then saponified to give CO2H-containing resins. These can be used for the complexation of heavy metals <79Mi4iioo). 

The crosslinking temperature of aliphatic poly(isocyanate)s, based on 1,6-hexane diisocyanate, which are blocked with equimolar quantities of diisopropylamine and 1,2,4-triazole is 139°C, without the addition of any catalyst. Aliphatic poly(isocyanate)s, which are bloeked with equimolar quantities of diisopropylamine and malonic acid diethyl ester have a cross-linking temperature of 130°C. °... 

A -Salicyloyl)amino-1,2,4-triazole exhibits a remarkably high rate of crosslinking in an alkylphenol-formaldehyde resin crosslinking for butyl rubber or ENB-type EPDM. 

Amino-1,2,4-triazole, which has a chemical structure very similar to that of 3-(A-salicyloyl)amino-1,2,4-triazole, shows no crosslinking ability under similar conditions. ... 

When a butyl rubber, an ethylidene norbomene (ENB)-type ethylene-propylene-diene monomer (EPDM), or a mixture of desired proportions of a butyl rubber and an ENB-type EPDM is thermally crosslinked using an alkylphenol-formaldehyde resin and a triazole compound, a higher crosslinking rate is obtained. When a hydrazide compound is also used, even higher crosslinking rates are obtained. 

The additive reaction of oxiranes was also utilized for the preparation of SMP networks with covalent crosslinks. The crosslinking of 3-amino-1,2,4-triazole with epoxidized natural rubber catalyzed by bisphenol-A resulted in polymer networks having shape-memory capability with Ti ms = Tg [82]. The Tg could be controlled by the 3-amino-1,2,4-triazole content in the range between 29 and 64 °C. Recently, the crosslinking reaction of oxiranes and amines was systematically investigated in two polymer systems based on the reaction of the diglycidyl ether of bisphenol A epoxy monomer cured with the bifunctional poly(propylene glycol)bis(2-aminopropyl)... 

Previously, we clarified the complexation of chitosan with hydroxybenzo triazole, resulting in a water soluble system of chitosan (27-25). The system is attractive since it provides the reaction, and especially the conjugation, in aqueous media. Based on this approach, the present work, thus, (i) demonstrates a simple but effective crosslink reaction by using poly(ethylene glycol) as the crosslinker to obtain a superabsorbent gel in aqueous, and (ii) proposes... 

HR modification with MA is accompanied by secondary reactions. Branches and crosslinks can appear by intermolecular grafting or by direct radicalic processes between species. Another possible reaction allowed by the presence of some impurities (Si, HjO, Na", K", Ca, Mg ) is MA decomposition, which can evolve toward explosion. To avoid secondary reactions, additives are introduced into the system (phenols, di- and trisubstituted phenols, Cu-naphthenate and acetylace-tone, halogenated triazine, triazols, phenylenediamine, phenylenecatechol). 

Energetic pol5nners are useful in rocket propellant binder compositions, as well as in propellant compositions for air bags in the automotive industry. They are, and formed from, poly(ether)s bearing pendant azide groups crosslinked without a catalyst by a diacetylene compound (42), or triazole and tetrazole pol5nners, respectively. 

Meudtner RM, Hecht S (2008) Responsive backbones based on alternating triazole-pyridine/ benzene copolymers from helically folding polymers to metallosupramolecularly crosslinked gels. Macromol Rapid Commun 29 347-351... 

Scheme 23 (a) Themial curing by formation of triazole unit, (b) UV curing by formation of azepine unit, (c) Films of hb-PPh in CHas pristine film (ri) thermally crosslinked film (B) and UV crosslinked film (C). Reproduced with permission frran [233]... 

Pt(II) complex which would react with DNA in a different way from diat of cisplatin. We have looked for an intrastrand crosslink, and at die same time a quite small distortion of the double helix, to reduce recognition chances by repair enzymes. Simple modeling already made clear that a rigid azole bridge (pyrazole, triazole) would generate a base-to-base contact of some 350 pm. The compound used as prototype is redrawn in Figure 10... 

The Huisgen cycloaddition reaction of azides with alkynes to produce triazoles was used to produce HA hydrogels and to encapsulate yeast cells during crosslinking. In this method, azide and alkyne functional groups were installed on HA using EDC chemistry. The hydrogel... 

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