Van Krevelen's Additive Molar Functions (AMF's)

D.W. Van Krevelen categorizes Additive Molar Functions into Seven Classes, each containing 3 AMF's, for treatment in his text. These are distinguished in Chapter 3 as:
  1. Those which are "exact" and "fundamental", since they are based on the mass and "hard" volume for the constituting atom groups; they are independent of temperature and time. These are covered in Chapter 4.
  2. Those which are connected with phase transitions and phase states and thus are of paramount importance for nearly all properties. These appear in Chapters 4 and 6.
  3. Those connected with the different forms of internal energy. These appear in Chapters 5 and 7.
  4. Those connected with the interplay between polymers and liquids or gases: solubility, wetting and repulsion (Chapters 7 and 8); permeability, diffusivity and sorption (Chapters 9 and 18).
  5. Those connected with elastic phenomena and molecular mobility: elasto-mechanical properties (Chapters 13 and 14); viscometric and rheological properties (Chapters 9, 15 and 16).
  6. Those connected with electromagnetic phenomena (Chapters 10, 11, 12).
  7. Those connected with thermal stability and decomposition (Chapters 20 and 21).
The corresponding AMF's in each Class are summarized below. The formulae for each of these AMF's, along with the standard units cited for all parameters in his tables, are in Scheme 3.3 (pgs 64, 65) of Van Krevelen's text.
  1. Class I: Fundamental
    • Molar mass, M
    • Molar number of backbone atoms, Z
    • Molar Van der Waals volume, V_w
  2. Class II: Phase Transition
    • Molar glass transition, Y_g
    • Molar melt transition, Y_m
    • Molar unit volume, V
  3. Class III: Internal Energy
    • Molar heat capacity, C_p
    • Molar melt entropy, del_S
    • Molar cohesive energy, E_coh
  4. Class IV: Interaction with liquids and gases
    • Molar attraction, F
    • Molar parachor, P_s
    • Molar permachor, PI
  5. Class V: Viscoelastic
    • Molar elastic wave velocity, U
    • Molar intrinsic viscosity, J
    • Molar viscosity-temperature gradient, H
  6. Class VI: Electromagnetic
    • Molar polarisation, P
    • Molar optical refraction, R
    • Molar magnetic susceptibility, X
  7. Class VII: Thermal Stability
    • Molar free energy of formation, del_G
    • Molar thermal decomposition, Y_1/2
    • Molar char forming tendency, C_ft
from:
Van Krevelen, D.W., Properties of Polymers, 3rd Ed., Elsevier: Amsterdam, 1990.

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Last modified 6/20/97 - GCR