Molecular weight and functionality

The program then requests specification as to type of polymer (line 320). If the "polymer" component is a collection of oligomers, the number of unique species is sought (line 360). The values for the mole (or weight) fraction, functionality and molecular weight of each species is then entered (lines 380-650). The number, site, and mass expectation values of the functionality and molecular weight (lines 650-810) are computed. The necessary site and mass distribution functions are also computed (lines 820-850). 

These parameters are used calculate the site and mass distribution functions assuming a Schulz-Zimm molecular weight distribution. The Schulz-Zimm parameters are calculated in lines 930-950. The weight fraction of diluent (as a fraction of the amount of polymer) is then sought. If there is no diluent enter 0. If there is a diluent, the functionality and molecular weight of the diluent is requested (line 1040). The necessary expectation values are computed (lines 1060-1150). 

Additionally, deactivation rate constants (kd) for the more active catalysts such as Cu X/Me4CYCLAM have been estimated from the initial degree of polymerization without reactivation, end functionality, and molecular weight distributions [138,141,142], With recent advances in determination of the equilibrium constant for atom transfer (KATRP=kJkd), deactivation rate constants (k =k KX[M,) can now be easily obtained from readily accessible activation rate constants (k) [115],... 

For a theoretical description of crosslinking and network structure, network formation theories can be applied. The results of simulation of the functionality and molecular weight distribution obtained by TBP, or by off-space or in-space simulations are taken as input information. Formulation of the basic pgf characteristic of TBP for crosslinking of a distribution of a hyperbranched polymer is shown as an illustration. The simplest case of a BAf monomer corresponding to equation (4) is considered ... 

Crosslinks can be controlled by the number of unsaturated sites in the polyester prepolymer. Theoretically if each molecule has only two reaction sites, then infinite, almost linear, chains could be obtained. Hence, average functionability and molecular weight distribution in the prepolymer are extremely important. Plasticizers can be used to advantage in adjusting the average properties of the binder as obtained in the solid propellant formulation. 

Functionality and Molecular Weight Distribution of Telechelic Polymers... 

Vakhtina, I. A. et al. A Study of the Functionality and Molecular Weight Dispersity for Stiff Foams, in Sintez i fiziko-khimiya polimerov (Synthesis and Physico-Chemistry of Polymers), p. 58, Kiev, Naukova dumka, 1976... 

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