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There are three steps to synthesize the MT vinylphenyl curable silicone resin. Step 1; MT vinylphenyl liquid silicone resin has been synthesized by trimethoxyphenyl silane (as the base material), divinyl - 1,1,3,3 - tetramethydisiloxane and hexamethyldisiloxane (as the end-capping agent) by co-hydrolysis condensation under acidic at first, and then the excess hydroxyl groups are eliminated under alkaline. Step 2: MT hydrophenyl curable silicone resin then has been prepared with trimethoxyphenyl silane (as the base material), 1,1,3,3 - tetramethyldisiloxane and hexamethyldisiloxane (as the end-capping agent) by hydrolysis condensation under acidic firstly, and then replaced by the active hydrogen groups under acidic. Step 3 : Both undergo the cross-linking reaction under the catalyst of platinum to obtain the MT phenyl curable silicone resin, with refractive index greater than 1.5, light transmittance greater than 90% and good thermal stability. It has Shore hardness from 60 A to 90 A, the tensile strength from 5. 15 MPa to 11. 35 MPa, which are good in the field of LED packaging for application. [ABSTRACT FROM AUTHOR]

In the face of the unprecedented public health crisis caused by the novel coronavirus pneumonia epidemic, front-line health workers are under enormous mental pressure. This paper aims to explore the mental health challenges faced by front-line health workers in the early stages of a public health emergency, such as stress, anxiety, and depression. At the same time, the factors that increase their mental stress are analyzed, and practical measures are put forward to prevent and manage mental health problems, aiming at improving the quality of medical treatment during public health emergencies. This paper has some reference value for people engaged in mental health prevention., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2024 Wang, Jiang, Zhang, Wu, Zhang, Cui, Zhang and Wang.)