ISSN:
0025-116X
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
A statistical theory is presented, concerning polyfunctional crosslinking of polymer initially heterogeneous with respect to molecular weight. It is an extension of Flory's theory concerning tetrafunctional crosslinking. Relationships between the equilibrium shear modulus, the crosslinking index, the sol fraction, and the functionality of the crosslinks are given for uniform polymer and for non-uniform polymer of unknown as well as known molecular weight distributions. It appears that at and just beyond the gel point, fractionation of the primary polymer has occurred in such a way that the number- and weight-average molecular weights of the primary polymer molecules, present in the network fraction, are equal to the weight- and z-average molecular weights of the original primary polymer, independent of the functionality of the crosslinks.
Additional Material:
2 Tab.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/macp.1991.021920312
