Structuration of blends

Such a conclusive consideration is certainly speculative. Nevertheless, it may be acceptable because of the detailed analysis of the experimental data. When each of the PLA, PDA, PG, PLIL and PLV samples was treated under the same conditions as in the individual cases of their blends as described above, the structure of polypeptides after its treatment did not change from the original structure as seen from the 13C CP/MAS NMR experiments. On the other hand, the structure of blended polypeptides after the treatment changes significantly. Therefore, it can be said that such a change comes from intermolecular interactions. 

Strength of the specific interaction. An example of this is shown in Fig. 9 for blends of poly(butyl acrylate) with chlorinated polyethylene. In this case the blend requires a higher activation energy than its additivity value in the form of heat to allow chain movements. A review of this subject and of the relations between and chemical structure of blends has been given by Cowie For miscible blends many attempts have been made to correlate the with the blend composition as is frequently done with random copolymers. Several miscible blends studied by Hammer and Hichman and Ikeda exhibit a composition dependence of which can be described by the simple Fox relationship. 

We investigated the miscibility behavior, specific interactions, and supramolecular structures of blends of the DNA-like copolymers poly(vinylbenzylthymine-co-butyl methacrylate) (T-PBMA) and poly(vinylbenzyladenine-co-styrene) (A-PS) with respect to their vinylben-zylthymine (VBT) and vinylbenzyladenine (VBA) contents through free radical copolymerizations as shown in Figure 2.6 [68]. 

Bouapao, L., Xsuji, H., Xashiro, K. etal. (2009) Crystallization, sphemlite growth, and structure of blends of crystalline and amorphous poly(lactide)s. Polymer, 50, 4007 017. 

The fact that the reversing signal is largely unaffected by annealing and its derivative provides an approximately Gaussian peak makes it a much better signal for assessing the structure of blends as described in Chapter 3. 

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