The polymers and the formulations were also studied by TGA. Measurements were carried out in dry air atmosphere using a Hi Res TGA Q5000 from TA Instruments. 1 to 3 mg of neat polymer or formulation were heated to 650 °C at 20 °C min -1 . Temperatures corresponding to 5 % mass losses are indicated as T5%. Temperatures corresponding to peak maxima in mass loss derivatives (DTG) are indicated as Tdeg.