Concurrent determination of two opposite phase transitions in a soft polymer nanocomposite by rheology and their theoretical evaluations

Rheologically determined phase diagram of poly(ε‐caprolactone)/poly(styrene‐co‐acrylonitrile) blends: Role of ramp rate in dynamic measurements

“…Based on the rheological responses, the mixing/demixing temperatures of polymer mixtures are generally determined by using two different protocols: (1) isothermal frequency sweep of storage and loss moduli, G ′ and G ″, at a linear strain and different temperatures below and above the phase boundary, and (2) dynamic isochronal temperature sweep by heating/cooling the samples from the homogeneous to the phase‐separated region of phase diagram at a linear strain, small frequency and heating/cooling rate . In the first protocol, the phase transition point is determined as the temperature in which the time–temperature superposition failure occurs .…”

“…The other models, however, have adjustable parameters that are estimated by fitting the experimental data points. Thus, it can limit the phase diagram predictability of the models especially for newly found and to be discovered blends . The CRS model has been successfully applied to a wide range of multicomponent polymer systems with different chemistries spanning from polyolefin mixtures to blends containing more polar components such as polycarbonates, poly(ethylene oxide), and poly(ε‐caprolactone) (PCL) …”

“…Based on the reported diagrams, some PCL/SAN blends at 10 and 50 wt % of SAN are far away from the critical point, known as off‐critical mixtures . The asymmetric phase diagram is typical phase behavior of blends with large disparity in glass‐transition temperature ( T g ) or molecular weight …”

Morphological evaluation and phase behavior of PVDF/PEO blends in the presence of graphene nanoplatelets through rheological measurements

“…Similarly, this method was considered to assess binodal and spinodal temperatures of some particle‐filled blends . The theoretical approach of Ajji and choplin is normally used to quantify the spinodal temperatures and assignment of the binodal temperatures by this method is less accurate and could be along with error . But the aforesaid method is able to show the variation of binodal temperatures and their limits qualitatively well.…”

“…43,44 The theoretical approach of Ajji and choplin is normally used to quantify the spinodal temperatures and assignment of the binodal temperatures by this method is less accurate and could be along with error. 42,45 But the aforesaid method is able to show the variation of binodal temperatures and their limits qualitatively well. The procedure is schematically shown in Figure 11 for 70/30/0.5 nanocomposite.…”