Divinylsulfone crosslinking

R. S. Kohn. Thixotropic aqueous solutions containing a divinylsulfone-crosslinked polygalactomannan gum. Patent US 4752339, 1988. 

A higher degree of divinylsulfone crosslinking was observed in the comparative sample because of the absence of O-methylation of a-cyclodextrin polyrotaxane. 

The hydroxyl group is commonly modified by etherification, divinylsulfone crosslinking, esterification and bis-epoxide crosslinking. Most common modifications of the hydroxyl group are shown in Figure 8.2. 

Table 27. Effect of polymer type on transition temperature and sharpness of transition of gels crosslinked with divinylsulfone [163]...

Aili D, Li Q, Christensen E et al (2011) Crosslinking of polybenzimidazole membranes by divinylsulfone post-treatment for high-temperature proton exchange membrane fuel cell applications. Polym Int 60 1201-1207... 

Other problems can arise which make it difficult to estimate the degree of crosslinking or ionic content from synthesis information. Divinylsulfone, which can be used to crosslink polysaccharides, may form sulfinic acid residues in the network instead of crosslinks [26]. Crosslinking by irradiation or physical Interactions is normally impossible to predict. Absorbents made from natural polymers may have inherently varying levels of ionic content, due to source-to-source variability. Ionic content induced by hydrolysis of pre-existing groups cannot typically be estimated accurately from kinetic data. 

Figure 5. Compression curve for hydroxypropyl cellulose gel produced by solution crosslinking of the linear polymer with divinylsulfone Q=31.7, U2 r=0.11. The modulus of...

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