Yingnan Feng, Chemical & Biomolecular Engineering, National University of Singapore, Singapore, Singapore, Martin Weber, Advanced Materials & Systems Research, BASF, Ludwigshafen, Germany, Christian Maletzko, Performance Materials G-PM/PU, BASF SE, Ludwigshafen, Germany and Tai-Shung Chung, Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore, Singapore