Porous/nanoporous PHT

A polymeric material comprising a plurality of hemiaminal units bonded together by a first linkage and a second linkage, wherein the first linkage is thermally stable and resistant to bases and the second linkage is thermally degradable and degradable by a base, wherein each hemiaminal unit has the general structure

• the first linkage has the general structure
• K′*)y′,
• wherein y′ is 2 or 3, and K′ is a divalent bridging group, having the structure
• wherein L′ is a divalent linking group selected from the group consisting of —O—, —S—, —N(R″′K—N(HK—R″″—, and a combination thereof, wherein R″″ and R″″ are independently selected from the group consisting of methyl, ethyl, propyl, iospropyl, phenyl, and combinations thereof, and each started bond of each divalent bridging group is covalently bonded to a respective starred bond of a hemiaminal unit, and the second linkage has the general structure
• wherein R is a substituted or unsubstituted alkyl, aryl, or alkoxy group having 1 to 50 carbon atoms, R′ is a substituted or unsubstituted alkyl or aryl group having 1 to 50 carbon atoms, and n is 1 to 1,000.