1. Dutch Polymer Institute P. O. Box 902 Eindhoven AX 5600 The Netherlands
2. Supramolecular Polymer Chemistry Group and Institute for Complex Molecular Systems Eindhoven University of Technology P. O. Box 513 Eindhoven MB 5600 The Netherlands
3. Department of Chemistry University of Basel St. Johanns‐Ring 19 Basel 4056 Switzerland
4. SABIC Plasticslaan 1 Bergen op Zoom PX 4612 The Netherlands