Nylon thin film preparation
Solution characterization
Microstructure investigation
Capacitor fabrication
Ferroelectric characterization
Ferroelectricity in MQS thick films
Solution NMR
Haze measurement
Differential scanning calorimetry
Fourier transform infrared spectroscopy
Wide-angle x-ray diffraction
Nylon-11 was purchased from Sigma-Aldrich. P(VDF-TrFE) (65 to 35) was purchased from Solvay. The weight-average molecular weight, Mw, of nylon-5, nylon-11, and P(VDF-TrFE) amounted to 5.8, 56, and 350 kg/mol, respectively. The number-average molecular weight, Mn, of nylon-5 was also determined on the basis of NMR end-group analysis in deuterated 1, 1, 1, 3, 3, 3-hexafluoro-2-propanol and amounted to 3.4 kg/mol. The molecular weight, Mn, of nylon-11 and P(VDF-TrFE) amounted to 39.7 and 170 kg/mol, respectively. TFA and acetone (99.8%, extra dry), were purchased from Carl Roth GmbH and Acros Organics, respectively. Cyclohexanone and acetone-d6 (99.9 atom % D) were purchased from Sigma-Aldrich. Nylon-5 was synthesized from 2-piperidone via anionic ring-opening polymerization in bulk in the presence of 1 mol % N-acetyl-2-piperidone as starter and 10 mol % tetramethylammonium 2-oxopiperidin-1-ide following the work of Coutin and co-workers (25).