Copolymerization of octamethylcyclotetrasiloxane (D4) with 1,3,5,7-tetrametyl-l,3,5,7-tetravinylcyclotetrasiloxane (V,) by heterogeneous acid catalysis has been carried out. In order to find the optimal conditions of the reaction, a second-order experimental design was performed with reaction time, reaction temperature, amount of catalyst, and the initial molar fraction of the mono-*
SynopsisThis article aims to carry out mathematical modeling of the mechanochemical degradation process of acrylonitrile-a-methyl styrene-vinyl acetate ternary copolymer in conditions that simulate its wet-spinning from dimethyl formamide solution. The influence of some factors on the mechanochemical degradation process is studied. Based on a great number of experiments a regression equation is determined, which correlates the intrinsic viscosity of the copolymer solution with the mechanical process variables (the length and length/diameter ratio, solution concentration, and pressure).
The coupling of 5‐nitro‐2‐furaldehyde‐semicarbazone on to poly(acrylic acid‐co‐vinyl alcohol) copolymer by the use of dicyclohexylcarbodiimide as activator has been studied.
On the basis of an experimental design, the influence of different parameters is studied (activator/support, drug/support, reaction time, solvent volume) in order to determine the optimum conditions for obtaining the maximum amount of the coupled drug on the support.
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