HYPERBRANCHED NANOMOLECULES: REGULAR POLYSTYRENE DENDRIGRAFTS

Muchtar, Zainuddin and Schappacher, Michel and Deffieux, Alain (2001) HYPERBRANCHED NANOMOLECULES: REGULAR POLYSTYRENE DENDRIGRAFTS. Jurnal Macromolecules, 34 (22). pp. 7995-7600.

[img]
Preview
Text
Hyperbranched nanomolecules - regular polystyrene dendrigrafts.pdf - Published Version

Download (354kB) | Preview
Official URL: http://pubs.acs.org/doi/abs/10.1021/ma010429q

Abstract

Arborescent graft polystyrenes were prepared by the “graft on graft” technique, involvingthe iterative grafting of end-functional polymer chains onto reactive polymer backbones. The grafts andthe reactive backbone building blocks were synthesized individually by living polymerization techniques.The first-generation comb polymers were obtained by the coupling reaction of living R-acetal polystyryllithiumonto poly(chloroethyl vinyl ether) PCEVE chains of controlled DPn. Initiation from acetaltermini of polystyrene branches of a new living cationic polymerization of chloroethyl vinyl ether (CEVE)allowed one to prepare the corresponding comb copolymers with polystyrene-b-poly(chloroethyl vinyl ether)branches. Hyperbranched polystyrenes were finally obtained by grafting a second amount of polystyryllithiumonto the CEVE units of poly(CEVE) external blocks. Nanomolecules of narrow molar massesdistribution, branching functionalities up to 35 000, and molar masses over 108 g/mol were obtained bythis method. By varying DPn of the different elementary building blocks, various polystyrene dendrigraftswere prepared, demonstrating the possibility to control the core-shell parameters of thesemacromolecular objects. The solution properties and the characteristic chain parameters ([è], Rg, Rh,) ofthe hyper-branched polystyrene macromolecules were determined and compared with literature data.

Item Type: Article
Keywords: Polymer; Hyperbranched polymer; Architecture; Polystyrene
Subjects: Q Science > QD Chemistry
Q Science > QD Chemistry > QD450 Physical and theoretical chemistry
Divisions: Fakultas Matematika dan Ilmu Pengetahuan Alam > Pendidikan Kimia
Depositing User: Mrs Harly Christy Siagian
Date Deposited: 11 Apr 2016 03:41
URI: http://digilib.unimed.ac.id/id/eprint/394

Actions (login required)

View Item View Item