A polymer layer includes a composition including polyborondimethylsiloxane and benzoyl peroxide. The polymer layer has a light transmittance of about 84% or more in a wavelength range of about 400 nm to about 800 nm. Therefore, the polymer layer exhibits strong impact resistance and optical transparency.

Porous networks are described linked by boronates. Also described are processes for producing the porous networks. The porous networks are formed by reacting a polyboronic acid with itself or with a polydiol, a polydiamine, or a polyamino alcohol. The resulting boronate linkage is covalently bonded. The characteristics and properties of the resulting porous material can be varied and altered by changing the reactants and by incorporating functional groups into the reactants. Of particular advantage, the porous materials can be formed at or near atmospheric pressure and at low temperature in the presence of one or more solvents.