By Dietmar Schwahn (auth.), K. F. Freed (eds.)
1 D. Schwahn: severe to intend box Crossover in Polymer Blends.- 2 K.F. Freed, J. Dudowicz: effect of Monomer Molecular constitution at the Miscibility of Polymer Blends.- three N. Clarke: impact of Shear stream on Polymer Blends.-
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Additional info for Phase Behaviour of Polymer Blends
23) separating the homogeneous from the two-phase region. This phase boundary of critical temperatures was determined from the SANS susceptibility in a similar way to that described in the context of Fig. 5. These blends always fulﬁll the conditions of criticality as binodal and spinodal curves were observed at the same temperature. 07. 07, both an upper and lower critical solution phase boundary is observed. Below the LCST boundary a droplet microemulsion phase is formed which at higher diblock content above LL transforms into a bicontinuous microemulsion phase.
5)10–3 becomes constant above ambient pressure. The last number appears very near the estimated Gi for incompressible polymer blends (see Fig. 8). It is found from the analysis that the effect of pressure on thermal ﬂuctuations is mainly determined by the variation of the mean ﬁeld parameters; at least for PB/PS the Ising critical amplitude C+ (deﬁned above in Eq. 17) is independent of pressure within an accuracy of 3% (Fig. 9 in ref. ). The FH parameters Γh and Γσ derived from the mean ﬁeld critical amplitude CMF in Eq.
Both values are depicted as solid and open points which show good agreement and demonstrate consistency is always positive, and both FH parameter terms Γh and Γσ decrease with pressure. Therefore, one expects at low temperature a negative change of the critical temperature with pressure when Γh becomes the leading term. From the data in Fig. 15 one evaluates the characteristic temperatures of 14 ◦ C, 60 ◦ C, and 132 ◦ C for the dPB(1,4), dPB(1,2;1,4), and dPB(1,2) samples, respectively, below which a negative ∆P TB is expected.
Phase Behaviour of Polymer Blends by Dietmar Schwahn (auth.), K. F. Freed (eds.)