相变硅油的合成及其相变行为

以1-十二烯（C12烯）、1一十四烯（C14烯）及聚甲基氢硅氧烷（PMHS）为原料，在Karstedt催化剂作用下，制备相变温度在0℃附近的相变硅油．红外光谱和13C与29Si核磁共振分析表明，C12烯和C14烯中的C=C双键与PMHS的Si—H侧基发生了硅氢加成反应，直链烷烃以侧链形式连接到了PMHS上，但由于位阻效应PMHS上的Si—H未完全反应，仍有少量残留在相变硅油中．差示扫描量热分析结果显示，所制备的相变硅油具有典型的有机烷烃相变材料特点，且相变温度范围相对较宽．与有机炕烃相变材料相比，相变硅油不存在过冷现象，更适于在低温贮存相变材料等方面得到应用．

Synthesis of Phase Change Silicone Oil and Its Phase Change Behaviors

In the presence of Karstedt catalyst, phase change silicone （PCS） oil with phase change temperature about 0 ℃ was synthesized by hydrosilylation of 1-dodecene, 1-tetradecene and poly （methylhydrolsiloxane） （PMHS）. Analyses of Fourier transform infrared spectroscopy, 13C and 29 Si nuclear magnetic resonances demonstrated that double bonds in 1-dodecene and 1-tetradecene had successfully reacted with Si--H of PMHS as side chains. And there was still a small amount of Si--H groups remaining because of steric effect. Results of differential scanning calo- rimetry showed that the phase change behaviors of the produced PCS were similar to the typical phase change materi- als such as organic alkanes, and the phase change temperature range was relatively wide. Compared with organic alkanes, PCS did not exhibit supercooling during phase change process, and should be more suitable to be used as phase change materials in storage at low temperature.