Supramolecular polymers incompatibility

In contrast to the above supramolecular polymers, recognition groups covalently attached as pendant polymer side chains (13) have been investigated for their potential elastomeric properties, first by Stadler and co-workers (14) in 1986 to increase miscibility between incompatible polybutadiene and poly-isoprene blends by employing the relatively weak dimerization of urazole moieties (iTdiin < 10 M M, and later in 2001 where G. W. Coates and co-workers... 

Another key point is selective chemical functionalization at one or both ends, or inside the chain (see scheme 2).m Thus, thiolo functions can serve as clips to create contact with metal surfaces or particles. Quantitative end functionalization of the rigid-rod on one end is a key step toward rod-coil copolymer synthesis (see scheme 3),131 and such a covalent coupling of incompatible polymer blocks is relevant for supramolecular organization.141... 

As can be seen from the data presented, the displacement of values of glass transition temperature of PHB occurs about 6-7°C. Most often in the literature as reasons for this phenomenon is called a limited solubility of the mixture components in each other (from a fraction of a few per cent) [1-3]. However, for the polymers probability such variant is extremely small because of the significant thermodynamic incompatibility. More probable reasons of displacement of the glass transition temperature may be changes of the supramolecular structure of polymers when mixing as well as differences in thermal expansion coefficients of polymers in the region above and below the glass transition temperature. 

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