SREENIVASAN, K2017-03-102017-03-10199142 ,8;402-40310.1002/actp.1991.010420814https://dspace.sctimst.ac.in/handle/123456789/9639Polymer ScienceEFFECT OF HARD SEGMENTS ON THE REFRACTIVE-INDEX OF POLYURETHANE BASED ON H-12-MDI