SEC (Size Exclusion Chromatopgraphy) experiments were carried out using a modular instrument consisting of a Waters Model 510 pump, a Waters Model U6K sample injector, a Waters Model 401 differential refractometer (Waters Corporation, Milford, MA, USA), and a set of three μ-styragel columns with a continuous porosity range from 106 to 103 Å. The columns were housed in an oven thermostatted at 40 °C. THF or CHCl3 was the carrier solvent at a flow rate of 1 mL min−1. The instrument was calibrated with polystyrene standards covering the molecular weight range from 3000 up to 600,000. 1H NMR spectra were recorded in chloroform-d at 30 °C with a Varian Unity Plus 300/54 NMR spectrometer (Varian, Inc., Palo Alto, CA, USA). Thermogravimetric analysis (TGA) experiments were carried out using a Q50 Model of TA Instruments (New Castle, DE, USA) employing samples of approximately 10 mg. The heating rate was adjusted to 10 °C min−1. Differential Scanning Calorimetry (DSC) experiments were conducted using a 2910 modulated DSC model from TA Instruments. The samples were heated at a rate of 10 °C/min from −30 to 180 °C. The second heating results were obtained in all cases.
Unity plus 300 54 nmr spectrometer
Manufactured by Agilent Technologies
Sourced in United States
The Unity Plus 300/54 NMR spectrometer is a nuclear magnetic resonance (NMR) instrument designed for analytical applications. It operates at a magnetic field strength of 7.05 Tesla, providing a proton (1H) frequency of 300 MHz. The instrument is equipped with a 54 mm superconducting magnet and can accommodate a variety of sample types and sizes.
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2 protocols using unity plus 300 54 nmr spectrometer
1
Polymer Characterization by SEC, NMR, TGA, and DSC
2
Polymer Characterization by SEC and DSC
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Size exclusion chromatography (SEC) experiments were carried out using a modular instrument consisting of a Waters Model 510 pump, a Waters Model U6K sample injector, a Waters Model 401 differential refractometer, and a set of 4 μ-Styragel columns with a continuous porosity range from 106 to 103 Å. The columns were housed in an oven thermostatted at 40 °C. THF or CHCl3 were the carrier solvents at a flow rate of 1 mL/min. The instrument was calibrated with polystyrene standards.
The glass transition temperatures were obtained by differential scanning calorimetry (DSC) using a 2910 modulated DSC model from TA instruments. The samples were heated or cooled at a rate of 10 °C/min. The second heating results were obtained in all cases.
1H NMR spectra were recorded in chloroform-d at 30 °C with a Varian Unity Plus 300/54 NMR spectrometer.
IR spectra were recorded in a Perkin–Elmer Model Spectrum 100 FT-IR using KBr pellets.
The glass transition temperatures were obtained by differential scanning calorimetry (DSC) using a 2910 modulated DSC model from TA instruments. The samples were heated or cooled at a rate of 10 °C/min. The second heating results were obtained in all cases.
1H NMR spectra were recorded in chloroform-d at 30 °C with a Varian Unity Plus 300/54 NMR spectrometer.
IR spectra were recorded in a Perkin–Elmer Model Spectrum 100 FT-IR using KBr pellets.
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