1. Department of Textile Engineering; Chemistry & Science and Fiber & Polymer Science Program; North Carolina State University; Raleigh NC 27695 USA
2. Department of Materials Science & Engineering; North Carolina State University; Raleigh NC 27695 USA
3. Department of Chemical & Biomolecular Engineering; North Carolina State University; Raleigh NC 27695 USA
4. Department of Chemical Engineering; Norwegian University of Science & Technology; N-7491 Trondheim Norway