Elisabetta Salatelli

Hybrid Organic–Inorganic Copolymers from Oxohydroxoorganotin Dimethacrylate and Methyl Methacrylate

Organic–inorganic polymeric derivatives constituted by methyl methacrylate co-units and an oxohydroxobutyltin macrocation difunctionalized with methacrylate counterions have been prepared by radical polymerization in solution. The reaction affords soluble products, indicative of a substantial absence of cross-linking originated by the difunctional macrocationic comonomer, when the molar excess of methyl methacrylate is high. The organic–inorganic hybrid products obtained have been characterized by various techniques, thus allowing us to propose a mechanism for their formation which implies a role as chain termination agent for the macrocationic monomer.

Synthesis by ATRP and Properties of Liquid Crystalline Three-Armed Star Polymers Containing Azobenzene Chromophores

Atom Transfer Radical Polymerization (ATRP) has been applied to synthesize liquid crystalline methacrylic polymers having three-arms star structure, starting from a central core of C3 symmetry. By just changing the duration of the polymerization process, macromolecules having distinct average chain lengths with low polydispersity values and well defined end-groups have been obtained. All the obtained star-shaped polymers, characterized by differential scanning calorimetry and polarized optical microscopy, exhibit smectic and nematic liquid-crystalline phases on heating, with transition temperatures strongly dependent on the average polymerization degree, and high clearing points. The comparison of these systems with the analogous linear derivatives pointed out higher glass transition temperature values, although they are characterized by lower average polymerization degree. Such behavior can be attributed to the stiffness of the aromatic core, which limits the free movement of chain ends.