Journal
EUROPEAN POLYMER JOURNAL
Volume 42, Issue 4, Pages 807-814Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.eurpolymj.2005.10.002
Keywords
poly(propylene imine) (PPI) dendrimer; N-isopropylacrylamide; reversible addition-fragmentation transfer polymerization; dendrimer-star polymers; core-first approach; lower critical solution temperature
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Two dendritic reversible addition-fragmentation transfer (RAFT) agents with 8 and 16 terminal dithiobenzoate (DTB) groups on the surface of poly(propylene imine) (PPI) dendrimers (generation 2.0 and 3.0, respectively) were successively prepared, and they were used in the RAFT polymerization of N-isopropylacrylamide (NIPAAM). The polymerization kinetics was confirmed to pseudo-first-order behavior. The H-1 NMR and GPC analyses show that the dendrimer-star den (NIPAAM)(x) (x=8 or 16) prepared by RAFT method has well-defined structure, controlled molecular weight and low polydispersities (PDI<1.3). The aqueous solution prepared from dendrimer-star PNIPAAM showed reversible changes in optical properties: transparent below a lower critical solution temperature (LCST) and opaque above the LCST. (C) 2005 Elsevier Ltd. All rights reserved.
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