Compatibilization by ionic interaction

Blends are discussed in alphabetical order of polymeric components. 

Immiscible polymer blends have been compatibilized through formation of a compatibilizing copolymer linked by ionic association instead of by covalent bonding. Although many examples have been published, most of these involve solutionmixing of the two immiscible polymers, viz. [Natansohn et al., 1990]. However, the examples given in this section describe only such polymer blends prepared by melt mixing. 

In a second type of ionic association (Process 5b) metal cations may mediate association between 

In a third type of ionic association (Process 5c) acidic groups such as carboxylic acids bound to one polymer may mediate interchain copolymer formation by protonation of basic groups on a second, immiscible polymer. In this case the compatibilizing agent is again most often a cross-linked copolymer. 

Mascia and Bellahdeb [1994 a, b] have com-patibilized Phenoxy polyether resin with an acid-functionalized polyacrylate resin through crosshnk-ing. A base, capable of forming alkoxide from the polyether hydroxy groups, should be used. Thus, 75-25 parts Phenoxy resin and 25-75 parts E-tBA-AA terpolymer (orEMAA Na ionomer) were blended in an internal mixer or TSE at 180-200°C in the presence of 2 parts NaOEt. Blends were characterized by selective solvent extraction, SEM, DSC, and rheology. The resulting crosslinked copolymers were used to compatibUize PET -I- HDPE. 

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Compatibilization by Ionic Interaction to Form Copolymer Reaction Type 5... 

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