Jump to main content
Jump to site search

Issue 4, 2012
Previous Article Next Article

Synthesis and thermal studies of aliphatic polyurethane dendrimers: a geometric approach to the Flory–Fox equation for dendrimer glass transition temperature

Author affiliations

Abstract

A new convergent synthesis for polyurethane dendrons to generation 4, and dendrimers to generation 3, is presented with control of surface functionality. The systematic synthesis of twenty-six new dendritic materials has led to a study of the factors affecting Tg using widely accepted approaches. The established understanding of dendritic polymerTg behaviour is that the Flory–Fox models, used for linear polymers, are unsuitable as the high number of chain ends and globular nature of dendrimers requires special consideration. In our review of the accepted understanding we have shown that the conventional Flory–Fox models predict Tg∞ accurately and generate identical values to the established modifications of the Flory–Fox equation that consider ‘dendrimer-relevant’ aspects such as the non-zero values of ne/M at infinite molecular weight. We also present a new approach using the geometric parameters of dendrimer mass evolution suggesting that the Flory–Fox equation is indeed appropriate for determination of dendrimerTg∞.

Graphical abstract: Synthesis and thermal studies of aliphatic polyurethane dendrimers: a geometric approach to the Flory–Fox equation for dendrimer glass transition temperature

Back to tab navigation

Supplementary files

Article information


Submitted
12 Sep 2011
Accepted
07 Nov 2011
First published
24 Nov 2011

Soft Matter, 2012,8, 1096-1108
Article type
Paper

Synthesis and thermal studies of aliphatic polyurethane dendrimers: a geometric approach to the Flory–Fox equation for dendrimer glass transition temperature

A. Stoddart, W. J. Feast and S. P. Rannard, Soft Matter, 2012, 8, 1096
DOI: 10.1039/C1SM06725G

Social activity

Search articles by author

Spotlight

Advertisements