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Fingerprinting state of cure of automotive elastomers

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Executive summary

This paper presents the development of pulsed proton Nuclear Magnetic Resonance technique for determining the
state of cure of polymeric materials.
Traditionally, crosslink density by swelling technique has been used for the state of cure control on materials and
finished products, such as O-rings, gaskets, couplings and other rubber applications.
Swelling as a tool for understanding chemical makeup of the rubber product can be supplemented by the NMR
technique providing a more sensitive analysis of automotive elastomeric product variations and quality.
The NMR technique, in conjunction with traditional techniques, helps us understand smaller variation in the rubber
chemistry because of its high sensitivity for changes from production and/or aging effects in molecular mobility of the
hydrogen atoms along the polymer chain.
NMR testing is non-destructive and can be used to set up benchmarks for quality control. Material process optimization
can be evaluated for most elastomers as they contain the hydrogen isotope.
This paper presents the NMR technique for production batches, finished products, plant-to-plant variations and a tool
for fingerprinting elastomers to understand the chemical state of the polymeric chains.
The presentation shows the test development effort at Akron Rubber Development Laboratory in the field of NMR
“State of Cure Fingerprinting.”


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Nguồn: Quốc Anh,Cao su Đức Minh

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