Front Cover: In article number 2000071 by Chensha Li, Liguo Sun, Jianqi Zhang, and co‐workers, polysiloxane main‐chain liquid‐crystalline elastomers (MC‐LCEs) are successfully prepared by using an ultrasonics sonochemistry method. In the first crosslinking step, the hydrosilylation polyaddition reaction is carried out in an ordinary laboratory ultrasonic cleaner at room temperature within 30 min to generate the network structure of matrices. Then, through the drawing process and second crosslinking step, the uniaxially aligned polysilxoane MC‐LCEs are obtained. The image shown is a 2D X‐ray scattering pattern of one of the LCEs.

中文翻译：

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超声声化学辅助制备聚硅氧烷主链液晶弹性体

前封面：在李晨沙，孙立国，张建起及其同事的文章2000071中，使用超声声化学方法成功地制备了聚硅氧烷主链液晶弹性体（MC-LCE）。在第一交联步骤中，在室温下在普通实验室超声清洁器中在30分钟内进行氢化硅烷化加成反应，以生成基质的网络结构。然后，通过拉伸过程和第二个交联步骤，获得了单轴排列的聚硅氧烷（MC-LCE）。所示图像是其中一个LCE的2D X射线散射图。