# Characterization of Responsive Plasters for Passive Moisture and Temperature Control
## 3 Results and Discussion
A further increase in relative humidity resulted in a more pronounced mass increase in all the modified plasters. \begin{table}
\begin{tabular}{c c c} \hline \hline
**Mixture** & **Water Vapor Resistance Factor (-)** & **Water Vapor Diffusivity (m2/s)** \\ \hline RP & \(9.31\pm 0.60\) & \(2.66\times 10^{-6}\pm 0.14\times 10^{-6}\) \\ PSC1 & \(8.63\pm 0.31\) & \(2.87\times 10^{-6}\pm 0.10\times 10^{-6}\) \\ PSC2 & \(8.36\pm 0.34\) & \(2.98\times 10^{-6}\pm 0.12\times 10^{-6}\) \\ PSC3 & \(8.22\pm 0.41\) & \(3.01\times 10^{-6}\pm 0.15\times 10^{-6}\) \\ PSC4 & \(8.30\pm 0.44\) & \(2.98\times 10^{-6}\pm 0.14\times 10^{-6}\) \\ PSC5 & \(7.92\pm 0.29\) & \(3.13\times 10^{-6}\pm 0.11\times 10^{-6}\) \\ \hline \hline \end{tabular}
\end{table} 
Table 6: Water vapor diffusion properties of studied plasters. \begin{table}
\begin{tabular}{c c c} \hline \hline
**Mixture** & **Water Absorption Coefficient (kg/m2 s1/2)** & **Moisture Diffusivity (m2/s)** \\ \hline RP & \(0.112\pm 0.011\) & \(1.61\times 10^{-8}\pm 0.078\times 10^{-8}\) \\ \hline PSC1 & \(0.136\pm 0.009\) & \(3.02\times 10^{-8}\pm 0.09\times 10^{-8}\) \\ \hline PSC2 & \(0.176\pm 0.012\) & \(8.46\times 10^{-8}\pm 0.17\times 10^{-8}\) \\ \hline PSC3 & \(0.226\pm 0.014\) & \(2.63\times 10^{-7}\pm 0.07\times 10^{-7}\) \\ \hline PSC4 & \(0.254\pm 0.024\) & \(4.90\times 10^{-7}\pm 0.16\times 10^{-7}\) \\ \hline PSC5 & \(0.294\pm 0.023\) & \(7.95\times 10^{-7}\pm 0.21\times 10^{-7}\) \\ \hline \hline \end{tabular}
\end{table} 
Table 5: Hygric properties of studied plasters. The criterion of highly saturated moisture content for indoor humidity control was confirmed by [PERSON] et al. [47]. Notable changes were observed in the hysteresis range, which was increased in line with the increased content of applied admixtures. This phenomenon corresponds mainly to the used SAP dosages, since the incorporation of PCMs based on diatomic did not reveal such intensive modifications [56]. The revealed changes rather refer to the potential of SAPs to modify the air humidity [37; 57] to a greater extent, and can be compared with the favorable results of the hemp shiv introduced by [PERSON] et al. [5], who prepared hemp-line plaster with improved moisture buffering. Particular attention should be paid to the understanding of changes in sorption/desorption hysteresis. As shown in Figure 7, the hysteresis between the sorption and desorption cycle is more evident for mixtures with a higher content of SAPs. This finding may be driven by the increased water retention capacity of SAPs and consequent modifications in water vapor sorption capacity. On the other hand, the hygric performance of the modified materials still represents a substantial improvement that can find prospective utilization in the passive moderation of indoor relative humidity. Despite the importance of the water vapor hysteresis for moisture buffering, this effect was not described in detail in the similar works of [PERSON] et al. [57] or [PERSON] et al. [58], despite its crucial impact on plasters' functionalization. As reported by [PERSON] et al. [59], the water vapor hysteresis needs to be taken into account within the assessment of moisture-buffering materials. Figure 6: Sorption and desorption isotherms: (**A**) RP; (**B**) PSC1; (**C**) PSC2; (**D**) PSC3; (**E**) PSC4; (**F**) PSC5. The MBV values given in Figure 8 closely correlate with the moisture storage capacity, and only a minor relation with moisture transmission properties can be noted. Suppositionally, the synergic effect of both the applied admixtures shifted the moisture buffering of the designed plasters up to 1.62 g/(%RHMm\({}^{2}\)) from an initial 0.89 g/(%RHMm\({}^{2}\)). Even more favorable results can be expected in the case of increased temperature, since this may result in the acceleration of the water vapor transmission and a lower retention capacity of the used SAPs.