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3837332 
Journal Article 
Preparation of water-soluble hyperbranched poly(sulfone-amine)s by polyaddition of N-ethylethylenediamine to divinyl sulfone 
Gao, C; Yan, DY; Zhu, XY; Huang, W 
2001 
1 
Polymer
ISSN: 0032-3861 
42 
18 
7603-7610 
WOS:000169119900015 
The new approach for synthesis of hyperbranched polymers from commercially available A(2) and BB ' (2) type monomers has been further developed. Water-soluble hyperbranched poly(sulfone-amine)s with multiple amino end groups were prepared by direct polyaddition of divinyl sulfone (DV, A(2)) to N-ethylethylenediamine (NDA, BB ' (2)). Effects of reaction conditions such as the feed ratio and solvents on the polymerization have been investigated. When the feed ratio of DV to NDA was equal to 1, no gelation occurred during the polymerization in water or organic solvents. Similarly, when the feed ratio of DV to AP was equal to 3/2, no insoluble or cross-linked material was observed in chloroform or other organic solvents such as N,N-dimethylforamide, N,N-dimethylacetamide and N-methyl-2-pyrrolidone. Interestingly, when water was used as solvent, the reaction mixture got turbid within 15-20 min and gelation occurred within 12-15 h. The turbid mixture formed during initial stage becomes a transparent solution in aqueous acid, which was coined as 'pseudo-gelation'. The solubility of the resulting polymer in water is as high as 1.68 g/ml. The degree of branching (DB) of all the resulting hyperbranched polymers is higher than 50% and the highest one is 70.9%. The reaction mechanism is presented and demonstrated with FTIR, HPLC and MS. During polymerization, secondary amino groups of NDA react rapidly with vinyl groups of DV within 12 s dominantly generating dimers which can be regarded as a new AB: type monomer. Further polymerization of the new monomers leads to hyperbranched poly(sulfone-amine)s. (C) 2001 Elsevier Science Ltd. Ah rights reserved. 
hyperbranched polysulfone-amine; N-ethylethylenediamine; divinyl sulfone