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Crystals 2021, 11, x FOR PEER REVIEW 10 of 15 Crystals 2021, 11, 951 9 of 14 Figure 6. FTIR spectra of paraffin wax, CNTs, PW-1CNT (0.5% CNT), PW-2CNT (0.75% CNT), and PW-3CNT (1% CNT). Figure 6. FTIR spectra of paraffin wax, CNTs, PW-1CNT (0.5% CNT), PW-2CNT (0.75% CNT), and PW-3CNT (1% CNT). The PW-1CNT, PW-2CNT, PW-3CNT, and PW spectra displayed four remarkable −1 pTehakes,PcWor-r1eCspNoTnd,iPnWg t-o2CthNeTp,rePsWen-c3eCoNf PTW, a.nTdhePbWonsdpsedcetrteactdeidspaltaayreodunfdou2r80r0emcmarkable are designated to the C-H stretching vibration of the CH /CH groups. The peak nea−r1 peaks,correspondingtothepresenceofPW.Thebondsd3etect2edataround2800cm are 1500 cm−1 is assigned to the bending vibration of C-H. The 717 cm−1 absorption band is designated to the C-H stretching vibration of the CH3/CH2 groups. The peak near 1500 credited to the in-plane deformation rocking vibration of the PW molecule [19,20]. The cm−1 is assigned to the bending vibration of C-H. The 717 cm−1 absorption band is credited spectra corresponding to the CNT showed a band of absorption around 3000 cm−1, which to the in-plane deformation rocking vibration of the PW molecule [19,20]. The spectra cor- can be accredited to the stretching of the C=C bonds. Bonds corresponding to the stretching responding to the CNT showed a band of absorption around 30−010 cm−1, which can be ac- of the C-C of the CNT structure were observed at around 1000 cm [19,21–23]. credited to the stretching of the C=C bonds. Bonds corresponding to the stretching of the The addition of CNT to the PW did not form any new peaks, and the PW-1CNT, −1 C-CPoWf t-2hCeNCTN, aTndstrPuWc-t3uCrNe Twoenrelyodbisperlavyeed atcaormobuindati1o0n0o0f cpmeaks[1c9o,r2re1s–p2o3n]d. ing to the PW aTnhdeCaNdTd.ition of CNT to the PW did not form any new peaks, and the PW-1CNT, PW- 2CNT, and PW-3CNT only displayed a combination of peaks corresponding to the PW 3.2.3. TGA Analysis and CNT. Thermogravimetric analyses (TGAs) were performed in alumina crucibles under C/min. nitrogen (flow rate, 100 mL/min) using a thermobalance Discovery SDT 650 from TA 3.2.3. TGA Analysis ◦ Instruments with a heating rate 10 Thermogravimetric analyses (TGAs) were performed in alumina crucibles under ni- Thermogravimetric analysis method: Figure 7 shows the measured TGA curves. The trogcelnea(rflmowassraltoes,s1t0h0atmisLo/mbsienrv)eudsiinsgdauethtoerpmaroabffialnandecegrDadisactoiovne.rFyuSrDthTer6m5o0rfer,otmheTnAeaIrnlystru- menotvsewrliatphpainhgeTaGtiAngcurravtes1in0F°iCgu/mrei7n.not only reveal the close paraffin impregnation amount but also the CNTs’ exceptionally stable thermal performance. In addition, the mass loss Thermogravimetric analysis method: Figure 7 shows the measured TGA curves. The that is seen in the thermal behaviour curves and as calculated in Table 4 confirm that the clear mass loss that is observed is due to paraffin degradation. Furthermore, the nearly CNT disperses well in the paraffin wax. In other words, CNT is known to be chemical inert overlapping TGA curves in Figure 7 not only reveal the close paraffin impregnation and shows resistance to thermal degradation of the thermal decomposition of paraffin wax amount but also the CNTs’ exceptionally stable thermal performance. In addition, the nanocomposites after the addition of CNT particles, as shown in Table 4 and Figure 7. It is mass loss that is seen in the thermal behaviour curves and as calculated in Table 4 confirm shown that the thermal decomposition of paraffin wax nanocomposites gradually moves to that the CNT disperses well in the paraffin wax. In other words, CNT is known to be a slightly higher temperature with increasing amounts of MWCNT particles. Even though chemical inert and shows resistance to thermal degradation of the thermal decomposition of paraffin wax nanocomposites after the addition of CNT particles, as shown in Table 4 and Figure 7. It is shown that the thermal decomposition of paraffin wax nanocomposites gradually moves to a slightly higher temperature with increasing amounts of MWCNT particles. Even though the CNT interaction with PW is weak due to the fact that CNT didPDF Image | Paraffin Wax As a Phase Changing Material PCM
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