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2 protocols using cyanomethyl dodecyl trithiocarbonate

1

Synthesis of Thermoresponsive Polymer Brushes

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The solvents petroleum ether (40–60 °C), diethyl ether, dichloromethane, ethyl acetate and acetone, and the reagents cyanomethyl dodecyl trithiocarbonate, 4,4′-azobis(4-cyanovaleric acid) (ACVA) and 4-dimethylaminopyridine (DMAP) were purchased from Sigma Aldrich and used as received. N-(3-Dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride (EDC·HCl) was purchased from Alpha Aesar and used as received. 1,4-Dioxane, and the monomers DEGMA, OEGMA (Mn = 300 g mol–1), nBA and DMA were purchased from Sigma Aldrich and passed through a column of basic alumina prior to use. NIPAM was purchased from Sigma Aldrich and recrystallized from a toluene–hexane mixture prior to use. 2,2′-Azobisisobutyronitrile (AIBN) was purchased from Sigma Aldrich and recrystallized from methanol prior to use. Dialysis membrane (MWCO = 3.5–5 kDa) was purchased from Spectra/Por. The synthesis of N,N-diethylacrylamide,61
2-cyano-2-propyl dodecyl trithiocarbonate,62
4-cyano-4-(((ethylthio)carbonothioyl)thio) pentanoic acid63
have been described previously in the literature.
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2

Synthesis and Purification of Polymeric Reagents

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Azobisisobutyronitrile
(AIBN, Sigma-Aldrich) was recrystallized from methanol prior to use.
Isobornyl acrylate (IBA; technical, Sigma-Aldrich) and lauryl acrylate
(LA; >98%, TCI) were passed over a basic alumina column prior to
use
to remove the stabilizer. Methyl acrylate (MA; 99%, Sigma-Aldrich)
was distilled prior to use. Pyridine, dichloromethane (DCM), and triethylamine
were distilled over calcium hydride (CaH2) prior to use.
Cyanomethyl dodecyl trithiocarbonate (CDT) was synthesized according
to a procedure mentioned in the literature.44 (link) 2-(Dodecylthiocarbonothioylthio)-2-methylpropionic acid (DDMAT;
98%, Sigma-Aldrich), trioxane (≥99%, Sigma-Aldrich), biphenyl
(>99%, Sigma-Aldrich), acetophenone (AP; 99%, Sigma-Aldrich), sodium
sulfate (≥99%, Sigma-Aldrich), acetic anhydride (≥99%,
Sigma-Aldrich), trans-2-[3-(4-tert-butylphenyl)-2-methyl-2-propenylidene]-malononitrile (DCTB; Sigma-Aldrich,
>98%), potassium trifluoroacetate (KTFA; Sigma-Aldrich, 98%), acryloyl
chloride (96%, Alfa Aesar), furfuryl alcohol (≥98%, Fischer
Scientific), hydrogen chloride (HCl; 37% solution in H2O, Acros Organics), sodium bicarbonate (>99%, Acros organics),
sodium
chloride (≥99.8%, Roth), tert-butyl methylether
(TBME; 99.9%), acetic acid (AcOH; 99.7%), and CDCl3 (99.8%,
Cambridge Isotope Laboratories) were used as received. All other solvents
were obtained from Biosolve and were used as received.
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