The history of ultrasound in polymer chemistry Goes back a ton way. Initially, its uses were limited to being an alternative method of initiating radical polymerizations through the decomposition of solvents to form radicals or through the breakage of polymers leading to macroradicals. Recently, the raw power of ultrasound has been focused through the use of weak linkages in polymer chains, which enables the production of well-defined macroradicals and coordinatively unsaturated metal complexes. (c) 2006 Wiley Periodicals, Inc.