Abstract
Cyclic poly(dimethylsiloxanes) (PDMS) (CH3SiO) x have been prepared1,2 in significant quantities up to molar masses of about 3 × 104 g mol−1. Both cyclic and linear PDMS with molar masses up to this value have freezing points in the range − 36 to − 86 °C.3 Hence, the physical properties which they exhibit at ambient temperatures are those characteristic of polymer melts. In addition, since the molar mass above which transient molecular entanglements become significant is around 2·4 × 104g mol−1 for PDMS melts,4 the physical properties of both cyclic and linear PDMS are determined largely by the configurational statistics of single molecules.
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