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1181010 
Journal Article 
Synthesis of poly[(styrene)-rotaxa-(crown ether)]s via free radical polymerization 
Gibson, HW; Engen, PT; Lee, SH 
1999 
1 
Polymer
ISSN: 0032-3861 
ELSEVIER SCI LTD 
OXFORD 
40 
7 
1823-1832 
English 
WOS:000078048400022 
Poly[(styrene)-rotaxa-(crown ether)]s were synthesized by free radical polymerizations of styrene in the presence of crown ethers using bulky 'blocking group' initiators to ensure end-capping for prevention of dethreading. These statistical processes produced only low threading yields, but up to 26% cyclic by mass with large crown ethers. The poly[(styrene)-rotaxa-(crown ether)ls 'emulsified' in protic solvents such as methanol and water. The dispersion polymerization of styrene in methanol or water using '42-crown-14' ('42C14') indicated that threading provided stability of the polyrotaxane micelles in such solvents through hydrophilic-hydrophobic phase separation. DSC investigations indicated that the threading prevents the crystallization of the crown ether and allows phase mixing to some extent, since two altered T-g's were observed. (C) 1999 Elsevier Science Ltd. All rights reserved. 
polyrotaxanes; crown ethers; micelles 
IRIS
• Methanol (Non-Cancer)
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