POLY-ALPHAMETHYLSTYRENE

An unambiguous stereochemical assignment of the alpha methyl absorptions is difficult to make. On the basis of the similarity of the observed spectra to the closely similar poly (alphamethylstyrene) ( , 10, Jl ), it is tempting to assign the upfield and downfield absorptions to syndiotactic and isotactic triads, respectively. This assignment would be supported by the 300 and 600 MHz 1h spectra of tetramer [14] that suggest predominant (>90%) formation of a racemic dyad. 

Isocyanates can be added to solvent-borne CR adhesive solutions as a two-part adhesive system. To improve the specific adhesion to different substrates, addition of a poly-alphamethylstyrene resin to solvent-borne CR adhesives is quite effective. 

---