Soft-graphoepitaxy using nanoimprinted polyhedral oligomeric silsesquioxane substrates for the directed self-assembly of PS-b-PDMS

Nanocontact printing stamp material via bi-functionalization of polyhedral oligomeric silsesquioxanes

“…Signals for the H-atoms from the unreacted double bond occurred at d 5.57 ppm and d 4.96-4.90 ppm for the MPA-functionalized POSS (3). Furthermore, 29 Si NMR measurements confirmed the formation of an oxysilylation product. The spectrum (Fig.…”

“…Moreover, the disappearance of the SiAH proton shift (d = 4.72 ppm) confirms the full functionalization of the cage structure. 29 Si NMR proves that no cage cleavage occurs and the POSS core is still intact. The spectrum (Fig.…”

“…4.84-4.92 (m,@CH 2 ), 5.52-5.58 (m, ACH@CH 2 ), 11.83 (br, COOH). 29 Si NMR (60 MHz, CDCl 3 , TMS ref, d ppm): 12.9 (3) was synthesized as follows: 1 g (0.98 mmol) of Octasilane POSS was dissolved in 10 ml of anhydrous toluene. 2-Methyl-4-pentenoic acid (8.64 mmol) was added in 10% excess.…”

“…13 C-APT-NMR spectra and 29 Si NMR were obtained using CDCl 3 and tetramethylsilane (TMS) in CDCl 3 as internal standard, respectively.…”

“…Functionalized POSS monomers were designed and synthesized by incorporating the necessary functional groups onto the Octasilane POSS backbone using hydrosilylation chemistry [28,29].…”