A three-dimensional phase boundary model for diffusion processes involved in reactions of crosslinked polymeric amines with low molecular weight esters

Koruthu, Desy P. ; Madhusudanan, P. M. ; Rajasekharan Pillai, V. N. (1997) A three-dimensional phase boundary model for diffusion processes involved in reactions of crosslinked polymeric amines with low molecular weight esters Proceedings of the Indian Academy of Sciences - Chemical Sciences, 109 (1). pp. 39-48. ISSN 0253-4134

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Official URL: http://www.ias.ac.in/j_archive/chemsci/109/3/39-48...

Related URL: http://dx.doi.org/10.1007/BF02871359

Abstract

The reactivity of amino groups attached to N-N'-methylene-bis-acrylamide (NNMBA)-and triethyleneglycol dimethacrylate (TEGDMA)-crosslinked polyacrylamide gels (2–20 mol% crosslinked) has been investigated by following the aminolysis of p-nitrophenyl ester of benzoyl glycine in a mixed solvent. A differential method was employed for following the rate of aminolysis reaction at definite intervals of time. The extent of aminolysis was found to be maximum between 25 and 35 min after initiation for these resins. The rate constants were calculated using the equation for three-dimensional phase boundary model with spherical symmetry and three-dimensional diffusion model. The reaction appears to be a phase boundary process up to 40 min after initiation and thereafter is fully controlled by three-dimensional diffusion. The rate constants do not show any dispersion when this model is used.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
Keywords:Crosslinked Polyacrylamide Support; Aminolysis of Polymeric Esters; Phase Boundary Process; Three-dimensional Diffusion
ID Code:38607
Deposited On:23 May 2011 06:35
Last Modified:17 May 2016 21:24

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