Fig. even inferior than that of neatFig. even inferior than that of neat

Fig. X and Table X1 be evidence for the DMA properties of neat WEP and its nanocomposites. It is documented that the assimilation of GO and [email protected] hybrid more or fewer enhance the storage modulus and Tg with a range of loading, apart from the 0.2 wt% of GO. On the other hand, nanocomposites containing [email protected] hybrid show signs of a superior enrichment for the identical loading. As exposed in Fig. Xa, the toting up of 0.2 wt% [email protected] hybrid can sustain the greater than before storage modulus of composites, at the same time as the addition of 0.2 wt% GO fails to improve the storage modulus of epoxy. In disparity, the elevated loading of GO deteriorates the stringency of WEP. This can be explained by the reinforcing outcome of [email protected] hybrid and the superior interface quality subsequent to surface functionalization. The glass transition temperature (Tg), shimmering the retort of polymer segments to the obligatory load appreciably, is a macroscopic sign of the respite behavior of nanocomposites systems. And its size is sturdily prejudiced by embedded particles (25). As revealed in Table X1, the Tg of [email protected]/WEP containing only 0.2 wt% [email protected] (more or less 105°C) was much upper than that of neat WEP (77°C), escalating by 28°C. A comparable trend possibly will be originate at 0.2 wt% loading of GO. The improved Tg value shows that incorporating GO and [email protected] into the waterborne epoxy matrix mutually confine the mobility of the polymer chains considerably with the intention that the relaxation can only crop up at elevated temperature. Nevertheless, with higher amount of GO introduced in waterborne epoxy; the Tg value of GO/WEP confirmed a noteworthy decrease, even inferior than that of neat WEP. In disparity, the Tg of nanocomposites remained much advanced value than that of neat WEP (about an increase of 13°C) at 0.3 wt% loading of [email protected] hybrid. Quite a few reasons are possibly endorsed to the above phenomena. Foremost, in reliable with the consequences of SEM and tensile properties of nanocomposites, the aggregation of GO at elevated loading leads to its deprived dispersion in waterborne epoxy matrix and decreases the incarceration effect, whereas the [email protected] remnants a well-dispersed circumstances in waterborne epoxy even in the midst of a higher loading. In addition, introducing GO can perturb the curing effect of WEP, leading to slow down reaction adaptation. This normally reduces the WEP cross-linkage and increases the polymer segments mobility. Alternatively, embedded GO sheets may incarcerate polymer segments and diminish the chain mobility. The steadiness of these two factors will control the glass transition temperature. If the negotiation factors be inclined to optimistic effect on polymer chain mobility, the Tg will lessen. The decreased Tg of GO/WEP is reliable with Bao’s consequences, who ascribed this phenomenon to ”cross-linking density reduction” effect (44). In addition, consistent with the literature study (34), we locate that surplus foreword of GO undeniably interferences with WEP curing reaction owing to the growth of viscosity, leading to a diminution in organic network density of WEP. In summary, an increase in the mobility of the WEP segments consequences in the decreased Tg of GO/WEP. In the case of [email protected] /WEP, the nail clippings of the grafting chains partake in curing process of WEP to shape chemical bonds. It is the consequence of reaction between Sulfonated magnetite Graphene Oxide and epoxide groups of WEP, which played the imperative role in enduring the cross-linking network density. The above reasons both enlighten the decreased Tg of GO/WEP and the remained Tg of [email protected] /WEP.