Non-reversible condensation

Polymers with intrinsic microporosity, abbreviated as PIMs, were developed for the first time by McKeown and Budd. The general design strategy involves incorporation of extended aromatic components within a rigid polymer network in order to imitate the structural layout of graphene sheets of activated carbons.The principle behind the synthesis of PIMs employs non-reversible condensation reactions to form polymers. These polymers cannot efficiently fill the space and pack together due to components that are rigid and ladder-like, and thus force the backbone of the polymer to twist or turn. 

Polymers with intrinsic microporosily, also abbreviated as PIMs, are soluble porous polymers formed from non-reversible condensation methods. These polymers cannot pack efflcientiy in the solid state due to rigid ladder-like components. Tliese polymers have a site of contortion in their stmcture and are known for their properties, including gas permeation and selective separation. 

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