Topochemical polymerizations triple bonds

Wegner G. Topochemical reactions of monomers with conjugated triple bonds. VI. Topochemical polymerization of monomers with conjugated triple bonds. Makromol Chem 1972 154 35-48. [Pg.334]

The topochemical polymerization of monomers with conjugated triple bonds is an interesting example of the relationship between packing properties and reactivity in the solid state. For solid state polymer-izability the monomer molecules must be arranged in a herringbone-like structure according to Figure 1 so that only one nearest distance between the triple bonds of adjacent molecules of 3 to 4 A is affected. To... [Pg.271]

If the crystal structures of the initial monomer and the polymer produced are crystallographically related, the polymerization is described as being topochemical or topotactic. Suitably substituted diacetylenes are so arranged in the crystal lattice that the conjugated triple bonds represent the steps of a ladder. Substituents linked by hydrogen bonding represent the runners of the ladder. A suitable substituent is, for example, —CH2—O—CO—NH—C6H5. A kind of shear takes place on polymerization, since the density difference between monomer and polymer crystals is small ... [Pg.758]