Abstract
The glass transition temperatures of fifteen samples of poly(dimethyl siloxane) polymers and oligomers have been measured by differential scanning calorimetry. Polymers with M n >2400 exhibit an asymptotic value of T g (∞)=148K, but for shorter chains the T g is lower. The thermomechanical behaviour has also been examined using a torsional braid analyser and this has served to confirm the chain length dependence of T g . A sub-glass transition, located in the temperature range 80–120K for short chain samples, has been attributed to methyl group rotation.
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