Title: Characterizing Thermoset Curing Using Rheology

Authors: Tianhong T. Chen, and Bharath Rajaram

DOI: 10.33599/nasampe/s.19.1595

Abstract: Studying the mechanical property changes accompanying a curing reaction is one of the most challenging rheological tests on account of the significant changes in sample properties during the curing process. In a typical thermoset cure, the change in modulus and viscosity can be as large as 6-8 orders of magnitude and can take place over short durations. This poses unique challenges for the experimentalist as the measurement torque can go from the instrument minimum in the pre-cure state to the maximum post-cure. As a result, one set of fixed test parameters cannot be used for monitoring the entire curing process. In this paper, we provided guidance for designing appropriate rheological test methods for curing analysis and elaborate on the importance of critical test parameters such as strain and axial force for achieving accurate and reproducible results. We concluded by comparing different approaches to quantify the gel point measurements and present results from gelation kinetics analysis.

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Conference: SAMPE 2019 - Charlotte, NC

Publication Date: 2019/05/20

SKU: TP19--1595

Pages: 17

Price: FREE