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stals 2021, 11, x FOR PEER REVIEW Crystals 2021, 11, 951 10 of 14 not functionalize, the CNT can still interact with the surrounding matrix and ca the overall thermal stability of the PW/CNT nanocomposite. The residual we Sample Code Onset Temperature ◦C 533.56 Mass Loss at 600 ◦C 94.237 Mass Loss % at 700 ◦C 85.234 CNT PW (2) Composite 1 Composite 2 Composite 3 243.12 Onset Tempera- °C,thaeftCeNrTcointesriadcetiroinnwgitthhPeWCiNswTeawkediugehtottlhoesfsacatnthdatcCoNnTsididerniontgfutnhctaiotntahliezeP,tWhe tempe CNT can still interact with the surrounding matrix and can improve the overall thermal completely decomposed at this point, as well as the fact that the CNT showed stability of the PW/CNT nanocomposite. The residual weight at 600 ◦C, after considering radation, was close to the initial loadings 0.5, 0.75 and 1 wt.% [24–26]. Also the CNT weight loss and considering that the PW temperature was completely decomposed Figautrtehi7s,poicnct,uarsrweenllcaesthoeffraactptihdatdtheegCrNadTasthiownedofaalilttllendaengoracdoamtiopn,owsiatsecsloaseretosthoewnat initial loadings 0.5, 0.75 and 1 wt.% [24–26]. Also as seen in Figure 7, occurrences of rapid °C due to the degradation of PW, but each single composite experienced differ degradation of all nanocomposites are shown at around 210 ◦C due to the degradation of loss. PW, but each single composite experienced different weight loss. 100 90 80 70 60 50 40 30 20 10 0 PW CNT PW-1CNT PW-2CNT PW-3CNT Mass (%) and PW-3CNT). and PW-3CNT). 0 100 200 300 Temperature (°C) Table 4. Mass loss of the PW, CNT, and composites 1, 2, and 3. Table 4. Mass loss of the PW, CNT, and composites 1, 2, and 3. Sample Code 0.281 0.171 0.195 249.26 ture °C −0.043 0.639 244.56 CNT239.97 1.603 533.561.493 94.237 0.98 85.2 Weighing Accuracy for thermobalance Discovery SDT 650 = ±0.5%; Standard uncertainty (mK) of electronic thermometer = ±1.0. 400 500 600 700 800 900 Figure 7. TGA thermogram of the paraffin wax/MWCNT and composites (PW-1CNT, PW-2CNT, Figure 7. TGA thermogram of the paraffin wax/MWCNT and composites (PW-1CNT Mass Lo 700 It was reported by Kuziel et al. [27] that in MWCNT (0.5 wt.%)–paraffin nanocom- Composite 1 249.26 0.171 −0.0 posites, the thermal conductivity is enhanced by 37%, in addition to increasing by 6.3% to PW (2) 243.12 0.281 0.1 Composite 2 244.56 1.603 0.6 the enthalpy phase change (∆Hm), compared to the paraffin, which has brilliant cycling stability. Individual and fibrous ultra-long MWCNTs have superior properties due to the Composite 3 239.97 1.493 0.9 faster nucleation of larger crystallites by MWCNTs via short- and long-range templating as Weighing Accuracy for thermobalance Discovery SDT 650 = ±0.5%; Standard uncerta well as the intrinsic properties of individual and fibrous ultra-long MWCNTs [28–30]. electronic thermometer = ±1.0. It was reported by Kuziel et al. [27] that in MWCNT (0.5 wt.%)–paraffin n sites, the thermal conductivity is enhanced by 37%, in addition to increasing the enthalpy phase change (∆Hm), compared to the paraffin, which has brilli stability. Individual and fibrous ultra-long MWCNTs have superior properties Mass Loss at 600 °CPDF Image | Paraffin Wax As a Phase Changing Material PCM
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