DSC XRD The crystalline properties of the samples

3. Results and discussion
3.1. FTIR study
Fig. 3. FT-IR spectra of (a) PEG; (b) sorbitol; (c) PCM-S; (d) dipentaerythritol; (e) PCM-D; (f) inositol; and (g) PCM-I.Figure optionsDownload full-size imageDownload as PowerPoint slide
3.2. Crystalline properties of SSPCMs
Fig. 4. XRD patterns of 8-CPT-2Me-cAMP reactants and the synthesized SSPCMs.Figure optionsDownload full-size imageDownload as PowerPoint slide
3.3. Phase change properties of SSPCMs
To investigate the phase change properties of samples, the DSC measurement was employed. In most previous literatures about the research of SSPCMs, the heating/cooling rate during DSC measurement was usually set as 10 K/min [10], [11], [13], [14], [17], [18], [19], [20], [22], [26], [28], [29], [30] and [32] or 5 K/min [12], [15], [16], [21], [23] and [27]. As we know, the measuring conditions especially the used heating/cooling rate have significant influences on the results of DSC measurement. Generally, the phase change properties of samples degrade obviously with the decrease of heating/cooling rate [34]. In the present work, the heating/cooling rate with 2 K/min was used for all the samples during the DSC measurement, which is a balance we found between improving test resolution and obtaining reasonable phase change enthalpies.