Intraparticle crosslinking

During the past 25 years, Funke and co-workers have extensively studied the emulsion polymerization of divinyl monomers alone including 1,4-DVB and ethylene glycol dimethacrylate (EDM A) under various reaction conditions. They found that the intraparticle crosslinking changes drastically the classical picture of emulsion polymerization. 

The building of high molar mass polymer by using intraparticle crosslinking is a well-practiced method in the trade. Monomers like divinylbenzene and triallyl cyanurate are often used for such purposes. 

EGDMA, ALMA, etc. Intraparticle crosslinking for solubility control, reduction of thermoplastic flow, solvent swelling resistance. 

Micro-gel fractions are a common feature of emulsion polymers because of intraparticle crosslinking. On the other hand, interparticle crosslinking, which occurs after film formation, significantly reduces the solubility of the polymer film. In this latter case, crosslinking is characterized by performing swelling experiments in organic solvents. 

The polymer particles contain co-polymerized carbonyl groups which, on film formation, react with hydrazide groups of the water-soluble acid dihydrazide to form hydrazone. Increased cohesion strength results due to both inter-particle and intraparticle crosslinking reactions. A similar process also occurs between corona-pre-treated polypropylene film and the emulsion adhesive thereby significantly increas-... 

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