## 2 Stability
### Combination of NR and CR, and \(Q\)  
To resolve the instability highlighted in the previous section, the resistance of the non-diene rubber to water, heat, etc. must be considered. Moreover, we attempt to combine the non-diene rubber to diene rubber. In the present report, we deal with Q as a non-diene rubber. It is structured as the basis of dimethylpolysiloxane (PDMS) as shown in Equation A8 in the Appendix A, which is similar to oil. On the contrary, NR and CR are similar to water. Therefore, when PDMS and NR or CR are combined, polyvinyl alcohol (PVA) is used, which is anionic as shown in Equation (4). PVA is an emulsifier, then NR-latex or CR-latex and PDMS can be combined by emulsion polymerization as shown in Figure 1.  
Q used in this report is KF96 (1 cSt, 50 cSt, 100 cSt, 1000 cSt) which is a silicone oil with the methyl group but not the rubber liquid, KE1400, and KE1300T that are hardened to be solid rubber using a curing agent. They are produced by Shin-Etsu Chemical Co. Ltd. (Tokyo, Japan). As for KE1400 and KE1300T, in general usage, they are solidified to be silicone rubber using a curing agent. KE1400 and KE1300T are improved because of solidification so that they are different from KF96; KE1400 and KE1300T are silicone oils with some silane, however, KF96 is a pure silicone oil without any silane. In the present study, we used only KE1400 and KE1300T without using the curing agent in the present combination. Therefore, the combination using KE1400 and KE1300T is different from that with KF96 from the perspective of the presence of silane. In the case of using PVA, we combined 3 g NR (Ulacol)- or CR (671A)- latex to the previously combined 3 g KF96, KE1400 or KE1300T with 3 g PVA. Figure 2  
Figure 1: Schematic diagram of hydrophilic and hydrophobic group of PVA, and emulsion polymerization between PDMS and NR- or CR-latex. shows the appearance of the combination, which can achieve the same results by other combinations except for the figure. As seen in Figure 2a, there are many small granulated lumps that are non-combined ones of PDMS and NR- or CR-latex. By comparing Figure 2a,b, PVA can be seen to have a role in the combination between diene and non-diene rubbers. In the case of Figure 2d, after the combination of the KE1400 and CR-latex (671A) with PVA, MCF consisting of 3 g Ni and 0.75 g MF (W-40) was combined. The combination of diene and non-diene rubber latexs with MCF also results in a highly uniform dispersion. Next, these combined liquids were electrolytically polymerized whereby a static magnetic field of 312 mT is applied to a pair of two stainless electrodes with a 1 mm gap using permanent magnets as paired opposites via the application of a constant electric field at 20 V, 2.7 A, and 5 min. The magnetic field strength can be determined by the production method such that has been presented in the previous studies [1]. It can be measure with Gauss meter probe which is an ordinary instrument for measurement of magnetic field. From trying many experiments, 312 mT has been confirmed to be optimal magnetic field strength in case of our present production method with 1-mm electrodes gap using permanent magnets as paired opposites via the application of a constant electric field at 2.7 A during 6-30 V, and 5-30 min. Therefore, we used 312 mT during the present study. The mass of each component is the same as that of Figure 2. In the case of using TiO\({}_{2}\), a liquid containing 0.5 g TiO\({}_{2}\) is combined beforehand to MF, combined with Ni, and then this liquid is combined to the combination of non-diene and diene rubber latexs with PVA. The combination of NR-latex and CR-latex is because the resistance to heat, ozone, etc. of CR-latex is superior to that of NR-latex. If we use just CR-latex as shown in Figure 3e,g,i, the electrolytically polymerized MCF rubber has such a thin thickness that it is difficult to handle at the subsequent procedure of producing it as a sensor style, as demonstrated in another experiment.