1. Department of Chemistry, School of Science and Technology, Kwansei-Gakuin University, Gakuen, Sanda 669-1337, Japan; State Key Laboratory of Polymer Physics & Chemistry, Joint Laboratory of Polymer Science and Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, P. R. China; and The Procter & Gamble Company, 8611 Beckett Road, West Chester, Ohio 45069