Polyurethane reaction between a new polyol and TDI under isothermal conditions was investigated. The progress of the reaction was monitored by following the viscosity as well as the monomer conversion. Viscosity variations were measured by means of a cone-and-plate viscometer while conversion was estimated by IR technique. An already reported empirical relationship between these two was verified. Stockmayer’s formula for weight average molecular weight of a linearly polycondensing system was used to find molecular weights at every stage of the reaction. The interdependence of viscosity and weight average molecular weight was confirmed, and the value of the index m was obtained. © 1991, Taylor & Francis Group, LLC. All rights reserved.

N. R. Neelakantan

N. Bala Subramanian

POLYURETHANES--MOLECULAR WEIGHT

Spectroscopy, Infrared

Viscometers

Viscosity

CONE-AND-PLATE VISCOMETER

STOCKMAYER'S FORMULA

Polymerization

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Studies on isothermal urethane polymerization

Polymer-Plastics Technology and Engineering

Kinetics and rheological studies were carried out on polyurethane reactions involving a new polyol and TDL Conversion of isocyanate by un-catalyzed polymerization under isothermal conditions was monitored by IR spectrometry and titration. Viscosity changes of the reaction mixture were followed by a digital cone-and-plate viscometer under identical conditions. Conversion and viscosity were found to follow a power relationship. A relationship involving the order of the reaction n that connects the viscosity with time was derived. This provides a new viscometric method to find the order of the reaction. The order of the reaction determined by this method was very close to the values obtained by a fractional-life method already reported. © 1991, Taylor & Francis Group, LLC. All rights reserved.

A viscometric approach to the study of the kinetics of polyurethane reactions

Polyurethane Elastomers

Analysis and Characterization of Polyurethane Elastomers

AIChE Journal

Laminar tube flow with a thermosetting polymerization

Studies of mold filling and curing in the reaction injection molding process

Polymer Engineering and Science

Rheology in polymerization processes

Viscosity changes during isothermal and adiabatic urethane network polymerization

Journal	Polymer-Plastics Technology and Engineering
ISSN	03602559
Open Access	No