Macroreticular porous polymer preparation

Macroporous or macroreticular polystyrenes have also been used as catalyst supports. (The terms macroporous and macroreticular are synonomous. They originated in different laboratories.) Macro-porous polymers are prepared by suspension polymerization of... 

Truly porous, synthetic ion exchangers are also available. These materials retain their porosity even after removal of the solvent and have measurable surface areas and pore size. The term macroreticular is commonly used for resins prepared from a phase separation technique, where the polymer matrix is prepared with the addition of a hq-uid that is a good solvent for the monomers, but in which the polymer is insoluble. Matrices prepared in this way usually have the appearance of a conglomerate of gel-type microspheres held together to... 

The resins studied (Rohm and Haas and Ionac) were all functionalized, cross-linked, styrene polymers with the exception of poly (4-vinyl-pyridine). Porous, macroreticular resins included the polymeric analogs of N,2V-dimethylbenzylamine (A21 polyDMBA, Rohm and Haas), N,N-dimethylaniline, and l-phenyl-2- (N,2V-dimethylamino) ethane (poly-Alipham), The last two materials were prepared in this laboratory. Nitrogen content of the porous resins was 4.1, 2.5, and 2.6 mequiv/gram, respectively. Poly(4-vinylpyridine) (6.9 mequiv/gram) had a gel-type structure. 

Millar, J. A., Smith, D. G., Marr, W. E., and Kresmarm, T. R. E. Solvent modified polymer networks. Part 1. The preparation and characterization of expanded-networks and macro-porous styrene-DVB copolymers and their sulfonates. J Cherw Soc, pp. 218-225 (1963). Kun KA, Kunin R. Macroreticular resins III. Formation of macroreticular styrene-divinyl-benzene copolymers. JPolym Sci, PartAl, Polym Chem, 6,2689-2701 (1968). 

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