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Molecular mass distributions of star‐branched polycondensates
Author(s) -
Versluis Cokki,
Nijenhuis Atze
Publication year - 2000
Publication title -
macromolecular theory and simulations
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.37
H-Index - 56
eISSN - 1521-3919
pISSN - 1022-1344
DOI - 10.1002/1521-3919(20001201)9:9<735::aid-mats735>3.0.co;2-x
Subject(s) - dispersity , monomer , molecular mass , polymer , molar mass distribution , molar mass , chemistry , distribution (mathematics) , mass distribution , computational chemistry , polymer chemistry , physics , mathematics , organic chemistry , astrophysics , mathematical analysis , galaxy , enzyme
Of late much attention has been paid to star‐branched polymers, being a good reference model for branched polymers, in general. Usually, monodisperse or narrow disperse polymers are analysed. Knowledge of molecular mass distributions is a key factor in the analysis and study of these systems. Star‐branched polycondensates can be synthesised by reaction of a difunctional ( AB ) monomer with a compound RA f . Weight and number molecular mass distributions of star‐branched polycondensates have been studied in relation to the initial molar ratio between R and the AB monomer ( α ), the average molecular mass per arm ( β ) and the number of arms ( f ). Simple probability density functions can be derived at, if molecules are split into – R (without core R ) and + R (with core R ). This enables further the representation in molecular mass units next to the representation in monomer units. Proper choice of α , β and f can either give narrower or broader distributions compared to the most probable distribution, which is the theoretical distribution for the pure AB polymer ( α = 0). The resulting polymer might either have a uni‐modal or a bi‐modal molecular mass distribution.