5.1 CHAPTER SUMMARY Polypropylene oxide (PPO) was incorporated in a controlled manner between polydimethylsiloxane (PDMS) and urea segments in segmented polyurea copolymers and their solid state structure-property behavior was investigated. The copolymers contained PDMS segments of MW 3200 or 7000 g/mol and an overall hard segment content of 10-35 wt %. PPO segments of MW 450 or 2000 g/mol were...

The main objective of this search was to prepare novel soluble polyureas with improved thermal stability. Accordingly, a new types of polyureas was prepared through the polycondensation reaction of a prepared diamine containing ether, keto, and naphthyl groups with 4,4’-diphenylmethan diisocyanate (MDI), toluene-2,4-diisocyanate (TDI), and isophorone diisocyanate (IPDI) in N-methyl-2-pyrrol...

Nanoporous polyurea-cross-linked Ca-alginate (X-Ca-alginate) aerogels were prepared by reacting an aliphatic or aromatic triisocyanate with the preformed biopolymer network post gelation and drying in supercritical CO2. The nanomorphology of native together those different X-Ca-alginate investigated using low-voltage scanning electron microscopy, N2-sorption porosimetry, contrast variation smal...

With the help of double hydrogen bonds between urea groups, a self-healing anti-icing coating was prepared from polydimethylsiloxane (PDMS)-based polyurea (PDMSPU) that synthesized bis(3-aminopropyl)-terminated PDMS and 2,4-toluene diisocyanate. Furthermore, by incorporating lubricant inert silicone oil cross-linking agent 1,3,5-tris-(4-aminophenoxy)benzene (TAPOB), coatings exhibited elastic, ...