Network formation of polyurethanes due to side reactions

Structural investigations of toluene diisocyanate (TDI) and trimethylolpropane (TMP)-based polyurethane prepolymer

“…However, the higher the temperature is, the more the higher molecular weight oligomers are formed, such as 2TMP-5TDI and 3TMP-7TDI. Due to the addition of branch points, there is an increase in viscosity and a change in the onset of gelation of the prepolymer [32,33]. Most notably, these reactions are expected to decrease the amount of isocyanate groups predicted.…”

Influence of the storage of reactive urethane quasi-prepolymers in their composition and adhesion properties

“…These secondary reactions are undesirable most of the time because they lead to branching and crosslinking, increasing the viscosity of the quasi-prepolymer and changing the onset of gel during curing [2]. Furthermore, these secondary products have degradation temperatures different from those of the urethane and urea linkages [3,4].…”

Sol MWD During Styrene, Vinyl Acetate, Methyl Methacrylate, and Butyl Acrylate Homopolymerization: A Numerical Study Using the NFT Approach

“…Equation (10) and (11) shows dimer formation for thermal initiation being irreversible or reversible, respectively. Equation (12) and (13) are mass balances for dimeric and monomeric radicals, respectively; they are not needed if either of the Hui and Hamilec [42] (second-or third-order) models are used.…”

“…[11][12][13][14] However, statistical methods have not been successful for modeling of polymer network formation in chain-growth polymerization systems.…”