Grafting-onto strategy substitution

In order to preserve the affinity with the nonpolar polypropylene matrix, the substitution of a small fraction of the matrix by another polypropylene with just a few polar groups grafted onto its backbone has been proven, in the last 20 years, to be a very effective strategy to promote isotactic polypropylene for engineering polymer applications. 

The second strategy is based on postsynthetic functionalization of a preexisting inorganic matrix. Mn(salen)-type complexes were covalently grafted onto the hybrid functionalized surface of porous silica (MCM-41) by reaction with vinyl substituted Schiff bases." ... 

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