Nanoporous crosslinked copolymers prepared by thermal degradation of poly(Methacryl-N,N '-diisopropylurea-co-ethylene glycol dimethacrylate)

摘要

Copolymers of methacryl-N,N'-diisopropylurea (MA-DiPrU) with ethylene glycol dimethacrylate (EDMA) at monomer-to-monomer ratios in the feed: 0.3/0.7; 0.5/0.5; 0.7/0.3; 0.8/0.2 were prepared in butanone in the presence of 2% of dibenzoyl peroxide (Bz(2)O(2)) at 70degreesC for 48 hr. Copolymers regardless of the ratio of comonomers in the feed decompose thermally at 200-250degreesC under the separation of isopropylisocyanate (iPrNCO). Residue, after the removal of iPrNCO are thermally,able nanoporous crosslinked copolymers of methacryl-isopropylamide (MA-iPrA) with EDMA which decompose by a one-step mechanism between 280degreesC and 450degreesC. Nonporous model copolymers poly(MA-iPrA-co-EDMA) of similar composition, prepared by copolymerization of MA-iPrA with EDMA, also decomposed by a one-step mechanism as shown by TGA measurements.