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A general equation in polycondensation
Author(s) -
Changren Zhou
Publication year - 1992
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1992.070440302
Subject(s) - monomer , branching (polymer chemistry) , condensation polymer , chemistry , thermodynamics , component (thermodynamics) , polymer chemistry , polymer , physics , organic chemistry
In polycondensation, we define F and f to be the true and effective average functionalities of the reaction system, respectively. The value of Q relates to the functionality and quantity of the nonbifunctional monomer. If there is monofunctional monomer in the reaction system, the value of Q may be less than 0. If the ring‐closure reaction in a system can be neglected, the relation among the molecular weight, the component of the reaction system, and the reaction extent of functional groups can be represented by the following equation: P = ( F − Q − 2/ x n )/ f . The equation may be used in line, branching, and cross‐linking polycon‐densations without any restrictional conditions. According to Carothers, the gelation point P c can be estimated by the following equation: P c = ( F − Q )/ f . All relations among the molecular weight of the polymer, the component of the reaction system, and the reaction extent of the functional group can be replaced by the new equation. Only the Flory equation that is used to estimate P c cannot be replaced by the new equation.