Abstract
Principal component analysis (PCA) is used here to determine percent composition of the four monomer units styrene, 1,2-butadiene (vinyl), trans-1,4-butadiene (trans), and cis-1,4-butadiene (cis) in styrene/butadiene rubber (SBR) copolymers and the three monomer units (vinyl, trans, and cis) in butadiene rubber (BR) polymers. Comparison of PCA with current methods is described. Cluster analysis is used to classify the SBR and BR into groups.
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