Kinetics of Model Reactions for Interfacial Polymerization

Abstract

Abstract:To model the rates of interfacial polycondensations, the rates of reaction of benzoyl chloride and methyl chloroformate with various aliphatic monoamines in acetonitrile were determined at 25 °C. Buffering with picric acid slowed these extremely fast reactions so the rate constants could be determined from the rate of disappearance of picrate ion. The rates of the amine reactions correlated linearly with their Swain-Scott nucleophilicities.

Scalable, Versatile Synthesis of Ultrathin Polyetherimide Films and Coatings via Interfacial Polymerization

“…[ 38 ] Indeed, step‐growth polyaddition of PAA from BPADA and MPD results in rate constants of ≈10 0 − 10 2 L mol −1 s −1 , [ 39 ] between that of IP of polyamides (≈10 2 − 10 5 L mol −1 s −1 ) [ 25 ] and polyaniline (≈10 −3 − 10 0 L mol −1 s −1 ). [ 40 ] From this we conclude that IP of PAA enables the same nanoscale control of polymer morphology as in oxidative IP with processing times comparable to those of interfacial polycondensation of polyamides.…”

Monitoring reactive microencapsulation dynamics using microfluidics

“…Accessing such information would however be important to optimize processes and fully control the encapsulation. 17 – 25 …”

“…The use of microcapsules for the controlled release and storage of active ingredients is of particular importance for various applications in medicine, especially in drug science, as well as for agriculture, food and cosmetic industry and for paper and textile manufacturing. [1][2][3][4][5][6][7][8][9][10][11][12][13][14] Reactive encapsulations that proceed via interfacial polymerization 12,13,[15][16][17][18][19][20][21][22][23][24][25] at oil/waterinterfaces are known since the 1960s and are widely used because of their versatility and robustness. Immediately aer contact of the two phases that contain the reactive monomers, respectively, a solidand most-likely cross-linked network precipitates at the interface as schematically shown in Fig.…”

“…Accessing such information would however be important to optimize processes and fully control the encapsulation. [17][18][19][20][21][22][23][24][25] In this article, we report on a microuidic tool for the direct visualization of the encapsulation kinetics of interfacial polymerizations. We use as a marker of the polymerization progress the change in the droplet deformability while a polymeric shell is forming at the interface.…”