Polymer 13 has two second-order transition temperatures, at - 66 [degrees] C and - 80 [degrees] C.
This might favor the partial dissolution of 13 in OIB due to the increased interactions between the isostearyl units and OIB and, at the same time, cause the change in the second-order transition temperatures detected experimentally.
In a second-order transition
, such as the demagnetization of iron when heated, the change is continuous, exhibiting a gradual change in behavior rather than a sharp break.
The second-order transition temperature of the vitrified AO-80 is about 45[degrees]C (measured by differential scanning calorimetry, DSC) .
The two second-order transitions gradually approached as the AO-80 content increased.