Polymer selection stiffness

Wet laminating allows for adhesive polymer selection from permanently tacky pressure-sensitive-type products in the = -40°C range to fairly stiff polymers that require some coalescence for adequate film formation. Generally, the lower Tg polymers are used to... 

The general correlations of structure and properties of homopolymers are summarized in Table 2.13. Some experiments which demonstrate the influence of the molecular weight or the structure on selected properties of polymers are described in Examples 3-6 (degree of polymerization of polystyrene and solution viscosity), 3-15, 3-21, 3-31 (stereoregularity of polyisoprene resp. polystyrene), 4-7 and 5-11 (influence of crosslinking) or Sects. 4.1.1 and 4.1.2 (stiffness of the main chain of aliphatic and aromatic polyesters and polyamides). 

A comprehensive overview on the different synthetic strategies leading to PPP polyelectrolytes is given in Chapter 3, p. 67 ff. Therefore a short description will be suffice here in order to demonstrate how the polymers PPP-1 and PPP-2 have been prepared which are under particular consideration here. Prior to this, however, a short comment may be indicated why we selected PPP as the parent system for our stiff-chain polyelectrolytes. 

The selection of the sieving polymer follows to a great extent the rules applied in DNA separations. Studies have revealed [27] that the efficiency of the sieving polymer depends on its chain stiffness and its hydrophobicity. The higher the flexibility of the polymer and the smaller its gyration radius due to hydrophobic interactions, the higher the concentration in the buffer has to be in order to achieve comparable separation efficiencies. 

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