Viscosity of bulk free radical polymerizing systems under near-isothermal and non-isothermal conditions |
| |
Authors: | Jitendra S. Sangwai Santosh K. Gupta |
| |
Affiliation: | Department of Chemical Engineering Indian Institute of Technology, Kanpur 2080 16, UP, India |
| |
Abstract: | A viscometer-reactor assembly is used to generate data on the viscosity, η(t), of an example polymerizing system exhibiting the Trommsdorff effect, namely, the bulk free radical polymerization of methyl methacrylate (MMA), at different temperature conditions [near-isothermal and non-isothermal (near-step increase and near-step decrease in temperature)] and at two different initiator, 2,2′-azoisobutyronitrile (AIBN), concentrations. Two types of cup and bob assemblies, viz., the Haake® SV-2 and the Haake® HV-DIN, have been used to measure η(t) of the reaction mass, until reasonably high values of viscosity, well into the gel effect region. Only three sets of experimental data on xm(t), Mw(t) and η(t) under near-isothermal conditions, are used to develop general correlations for the viscosity. These tuned correlations predict the values of the viscosity for a whole variety of other experimental conditions, including non-isothermal cases, reflecting that the physics of the system is well represented by them. Hence, these correlations can be used for other systems after tuning their parameters. The feasibility of on-line soft sensing is demonstrated for a few cases. |
| |
Keywords: | Bulk free radical polymerization Rheokinetics Soft sensor |
本文献已被 ScienceDirect 等数据库收录! |
|