The scaling behavior of the molecular parameters of the hyperbranched polymers made by self-condensing vinyl polymerization.
The hyperbranched polymers can be made by self-condensing vinyl polymerization without gelation transition. The average molecular weights, as well as the average sizes, can reach infinite values as the reaction is quantitatively completed, and the scaling forms of the molecular parameters should exist. In the paper, based on a recursion formula, the scaling form of the number fraction distribution and the number of the n-mers are given analytically as the conversion of double bonds is near 1. The mean square radius of gyration for very large hyperbranched polymers is calculated explicitly to give a scaling exponent. Finally, a scaling relation associated with the fractal dimension and the polydispersity exponent is given clearly.
Ba
X W
XW
College of Chemistry & Environmental Science, Hebei University, Baoding 071002, PRC. baxw@mail.hbu.edu
Tian
Y L
YL
Diao
J Z
JZ
Wang
S J
SJ
Wang
H J
HJ