Random copolymers intensity factor

The properties of random copolymers can be estimated by using weighted averages for all extensive properties, and the appropriate definitions for the intensive properties in terms of the extensive properties. Let lrq, m2,. .., mn denote the mole fractions (see Section l.D) of n different types of repeat units in a random copolymer. [The most common random copolymers have n=2. Terpolymers (n=3) are also often encountered.] The n mole fractions then add up to one, and the extensive properties of a random copolymer can be estimated by using mole fractions as weight factors ... 

The above results demonstrate that we can reproduce both the positions and the intensities of the meridional maxima using a model for a completely random copolymer sequence. In separate work [12] we have checked the sensitivity of the calculations to non randomness, i.e. blockiness, by calculation of Q(z) for unequal monomer reactivities, and the results show that all but minimal blockiness can be ruled out. Tilting the residues is only one of several possible ways to refine the model so as to improve the intensity match. We are presently investigating a distribution of tilt angles (rather than a single tilt for each residue type) and details of this work will be presented at a later date. A further factor that could affect the meridional intensity is the presence of three-... 

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