PMID- 18627145
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20081006
LR  - 20080806
IS  - 1520-5126 (Electronic)
IS  - 0002-7863 (Linking)
VI  - 130
IP  - 32
DP  - 2008 Aug 13
TI  - Design and use of organic nanoparticles prepared from star-shaped polymers with 
      reactive end groups.
PG  - 10802-11
LID - 10.1021/ja801055f [doi]
AB  - Star-shaped poly(isobornyl acrylate) (PiBA) was prepared by atom transfer radical 
      polymerization (ATRP) using multifunctional initiators. The optimal ATRP 
      conditions were determined to minimize star-star coupling and to preserve high 
      end group functionality (>90%). Star-shaped PiBA with a narrow polydispersity 
      index was synthesized with 4, 6, and 12 arms and of varying molecular weight 
      (10,000 to 100,000 g x mol(-1)) using 4 equiv of a Cu(I)Br/PMDETA catalyst system 
      in acetone. Matrix-assisted laser desorption/ionization time-of-flight 
      (MALDI-TOF) analysis, NMR spectroscopy, and size exclusion chromatography (SEC) 
      confirmed their controlled synthesis. The bromine end group of each arm was then 
      transformed to a reactive end group by a nucleophilic substitution with 
      methacrylic acid or cinnamic acid (conversion >90%). These reactive star polymers 
      were used to prepare PiBA nanoparticles by intramolecular polymerization of the 
      end groups. The successful preparation of this new type of organic nanoparticles 
      on a multigram scale was proven by NMR spectroscopy and SEC. Subsequently, they 
      have been used as additives for linear, rubbery poly(n-butyl acrylate). Rheology 
      measurements indicated that the viscoelastic properties of the resulting 
      materials can be fine-tuned by changing the amount of incorporated nanoparticles 
      (1-20 wt %), as a result of the entanglements between the nanoparticles and the 
      linear polymers.
FAU - Van Renterghem, Lieven M
AU  - Van Renterghem LM
AD  - Department of Organic Chemistry, Polymer Chemistry Research Group, Ghent 
      University, Krijgslaan 281 S4-bis, B-9000 Ghent, Belgium.
FAU - Lammens, Mieke
AU  - Lammens M
FAU - Dervaux, Bart
AU  - Dervaux B
FAU - Viville, Pascal
AU  - Viville P
FAU - Lazzaroni, Roberto
AU  - Lazzaroni R
FAU - Du Prez, Filip E
AU  - Du Prez FE
LA  - eng
PT  - Journal Article
DEP - 20080716
PL  - United States
TA  - J Am Chem Soc
JT  - Journal of the American Chemical Society
JID - 7503056
EDAT- 2008/07/17 09:00
MHDA- 2008/07/17 09:01
CRDT- 2008/07/17 09:00
PHST- 2008/07/17 09:00 [pubmed]
PHST- 2008/07/17 09:01 [medline]
PHST- 2008/07/17 09:00 [entrez]
AID - 10.1021/ja801055f [doi]
PST - ppublish
SO  - J Am Chem Soc. 2008 Aug 13;130(32):10802-11. doi: 10.1021/ja801055f. Epub 2008 
      Jul 16.