Polarised optical microscopy was performed on a Leica DMLP polarising microscope with temperature control via a Linkam TMS94 hotstage and controller. Photomicrographs were captured using a Nikon D7200 DLSR mounted atop the microscope. Differential scanning calorimetry employed a TA instruments DSC Q20 at a heat/cool rate of 10 °C min -1 , operating under an atmosphere of dry nitrogen.