Doubly-dendronized linear polymers

Justin L. Mynar, Tae-Lim Choi, Masaru Yoshida, Victor Kim, Craig J. Hawker, Jean M. J. Fréchet
2005 Chemical Communications  
General. THF was distilled from Na / benzophenone before use. Triethylamine was distilled from CaH 2 . All other solvents used were reagent grade. All reagents were used as supplied. All 1 H NMR spectra were measured with a Bruker DRX-500 spectrometer at 500 MHz. Analytical size exclusion chromatography (SEC) in N,N-dimethylformamide (DMF) HPLC grade with 0.2% wt LiBr was performed at 70 °C at a nominal flow rate of 1.0 mL/min on a chromatography line calibrated with linear
more » ... oly(methylmethacrylate) (PMMA) standards (1,280 -910,500 Da) and fitted with two 7.5 x 300 mm PSS SDV linear (5-µm paticle size). The SEC system used when determining PMMA-equivalent molecular weights consists of a Waters 510 pump, a Waters U6K injector, and a RI Waters 410. Preparative SEC in DMF was performed at ambient temperature at a nominal flow rate of 2 mL/min and fitted with a 600 x 20 mm PSS SDV linear "prep" (10-µm paticle size). THE SEC prep system consists of a Waters 510 pump, a Rheodyne injector with 1 mL sample loop, RI Waters 410, and a Waters fraction collector II.
doi:10.1039/b509398h pmid:16228024 fatcat:5ai4rs3pzrdu7jolzoxrw2z65a