Dsc q200

¹H NMR spectroscopy was performed on a Bruker 300 MHz nuclear magnetic resonance instrument. The number-average molecular weight (M_n,GPC) and molecular weight distribution (Đ) of the polymers were determined with Waters 1515 gel permeation chromatography, equipped with triple detection, including Waters 2424 refractive index detector, Wyatt VicoStar viscosity detector, and Wyatt TRI STAR Mini DAWN HELEOS II eighteen angle light scattering detector, using HR 1, HR 2, and HR 4 (7.8 × 300 mm², 5 μm beads size) columns with a measurable molecular weight ranged 5 × 10² to 5 × 10⁵ g mol⁻¹. THF was used as the eluent at a flow rate of 0.6 mL min⁻¹ and 40 °C. GPC samples were injected using a TOSOH plus auto sampler and calibrated with PS standards purchased from TOSOH. Thermogravimetric analysis (TGA) was carried out on a 2960 SDT TA instruments with a heating rate of 10 °C min⁻¹ from 30 to 800 °C under the nitrogen atmosphere. The DSC analyses for these polymers were performed on a TA Instrument DSC Q200from −80 to 80 °C under a nitrogen atmosphere, with a heating rate and a cooling rate of 20 °C min⁻¹ for the first time, and a heating rate of 10 °C min⁻¹ for the second time. The degree of crystallinity of the polymers was measured in the DSC-thermogram of the crystallized peak (exotherm peak) and the molten peak (endothermal peak) in the second heating cycle.

DSC was undertaken on a TA Instruments DSC Q200 (Delaware, USA) using nitrogen as purge gas to analyse thermal properties of powders post-milling. DSC heat flow was calibrated using indium (melting point 156 °C), and samples weighing 3 ± 0.1 mg were sealed inside Tzero pans. A sealed empty Tzero pan was used as a reference, and each sample was ramp heated at 10 °C/min from 30 °C to 180 °C to detect for thermal differences. Analysis of the thermographs was performed using TA Universal Analysis 2000 software v4.5A. Each powder was analysed in triplicate.