Modeling.(Free Radical Polymerizations Associated with the Trommsdorff Effect Under Semibatch Reactor Conditions, part 1): An article from: Polymer Engineering and Science
Book Details
PublisherSociety of Plastics Engineers, Inc.
ISBN / ASINB00093RV78
ISBN-13978B00093RV71
MarketplaceFrance 🇫🇷
Description
This digital document is an article from Polymer Engineering and Science, published by Society of Plastics Engineers, Inc. on August 1, 1995. The length of the article is 6348 words. The page length shown above is based on a typical 300-word page. The article is delivered in HTML format and is available in your Amazon.com Digital Locker immediately after purchase. You can view it with any web browser.
From the author: Several important polymerizations [e.g., poly(methyl methacrylate) (PMMA), polystyrene] exhibit gel and glass effects during polymerization. These are associated with the decrease of the diffusivities of the macroradicals and monomer molecules with increasing viscosities of the reaction mass. A new model has been developed to account for the gel and glass effects, both under batch and semibatch reactor operations. The free volume theory of Vrentas and Duda has been used to account for the changes in the diffusion coefficients. The model parameters are tuned using experimental data on the isothermal bulk and solution polymerizations of MMA in batch reactors. Conversion histories and molecular weights have been obtained for cases where solvent, initiator or monomer are added to (or removed from) the reaction mass after some reaction has taken place. In addition, studies involving step changes in temperature have been carried out. It is found that the conversion vs. time behavior after such step changes depend upon a complex interplay of three factors: polymer concentration, molecular weight, and the temperature at the point these changes are effected.
Citation Details
Title: Modeling.(Free Radical Polymerizations Associated with the Trommsdorff Effect Under Semibatch Reactor Conditions, part 1)
Author: Asit B. Ray
Publication:Polymer Engineering and Science (Refereed)
Date: August 1, 1995
Publisher: Society of Plastics Engineers, Inc.
Volume: v35 Issue: n16 Page: p1290(10)
Distributed by Thomson Gale
From the author: Several important polymerizations [e.g., poly(methyl methacrylate) (PMMA), polystyrene] exhibit gel and glass effects during polymerization. These are associated with the decrease of the diffusivities of the macroradicals and monomer molecules with increasing viscosities of the reaction mass. A new model has been developed to account for the gel and glass effects, both under batch and semibatch reactor operations. The free volume theory of Vrentas and Duda has been used to account for the changes in the diffusion coefficients. The model parameters are tuned using experimental data on the isothermal bulk and solution polymerizations of MMA in batch reactors. Conversion histories and molecular weights have been obtained for cases where solvent, initiator or monomer are added to (or removed from) the reaction mass after some reaction has taken place. In addition, studies involving step changes in temperature have been carried out. It is found that the conversion vs. time behavior after such step changes depend upon a complex interplay of three factors: polymer concentration, molecular weight, and the temperature at the point these changes are effected.
Citation Details
Title: Modeling.(Free Radical Polymerizations Associated with the Trommsdorff Effect Under Semibatch Reactor Conditions, part 1)
Author: Asit B. Ray
Publication:Polymer Engineering and Science (Refereed)
Date: August 1, 1995
Publisher: Society of Plastics Engineers, Inc.
Volume: v35 Issue: n16 Page: p1290(10)
Distributed by Thomson Gale
