Generally, In thermoplastic polyurethane elastomer (TPU), polydiol chains, known as soft segments and diisocyanate chains, called hard segments are arranged in a certain ratio. This hard and soft segment ratio in TPU governs its properties and application. Therefore, it is logical to determine the ratio of the hard and the soft segments in TPU.
Dear Neeraj Mandlekar, normally the ratio is more or less the same as the one in the feed. Experimentally, it Can be calculated by characteristic elements via NMR and elemental analysis for example. Please have a look at the following documents. My Regards
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7664240/
https://link.springer.com/article/10.1007/s42452-019-0908-3
https://doi.org/10.1016/B978-0-08-100614-6.00001-9
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