私密直播全婐app免费大渔直播,国产av成人无码免费视频,男女同房做爰全过程高潮,国产精品自产拍在线观看

One kind of side chain liquid crystal epoxy (S-LCE) based on biphenyl mesomorphic unit is synthesized from 2, 2-bis(hydroxymethyl)propionic acid, 4-phenylphenol, and epichlorohydrin. And the intrinsic thermal conductive liquid crystal epoxy film (LCEF) simultaneously combining with intrinsic self-healing performance is then prepared via thiol-epoxide nucleophilic ring-opening reaction and coating method. 1H NMR and FTIR show that S-LCE and LCEF have been successfully prepared. S-LCE presents nematic liquid crystal from room temperature to 160°C. LCEF maintains nematic liquid crystal performance and shows highly intrinsic thermal conductivity & excellent self-healing performance. Thermal conductivity coefficient (λ) values in vertical direction (λ_⊥) and parallel direction (λ_∥) of LCEF are 0.33 and 1.25 W/mK, respectively, much higher than that of general bisphenol A epoxy resin (E-51, λ_⊥ of 0.19 W/mK and λ∥ of 0.65 W/mK). Tensile strength of LCEF is 10.6 MPa, which can maintain at 90.6% and 61.3% after one and four cycles of self-healing behavior, respectively. In addition, LCEF presents a wide service temperature range (-9.8–251°C) and good thermal stability (T_HRI of 148.5°C). Simultaneously, LCEF has good transparency, flexibility, and tailorability, expected to be utilized in the fields of flexible electronic devices and intelligent structures.以2,2-二羥甲基丙酸、4-苯基苯酚和環氧氯丙烷為主要原料合成了一種基于聯苯介晶基元的側鏈型液晶環氧（S-LCE），再通過硫醇-環氧親核開環反應配合涂膜成型工藝制備了一種基于酯交換反應實現自修復功能的本征型高導熱液晶環氧膜（LCEF）。核磁共振氫譜（¹H NMR）和紅外光譜（FTIR）表明S-LCE及LCEF均已成功合成；S-LCE表現為向列相液晶，其液晶區間為常溫～160^oC；LCEF仍保持向列相液晶性，且表現出優異的本體導熱性能和自修復功能；其垂直方向（λ_⊥）和平行方向（λ_∥）的導熱系數分別為0.33 W/mK和1.52 W/mK，遠高于通用雙酚A環氧樹脂（E-51）的λ_⊥（0.19 W/mK）和λ_∥（0.65 W/mK）；LCEF的拉伸強度為10.6 MPa，經1次和4次修復后的拉伸強度分別保持在90.6 %和61.3%；此外，LCEF表現出較寬的使用溫度范圍（-9.8～251^oC）和較好的熱穩定性（耐熱指數，THRI為148.5^oC）；同時，LCEF還具有較好的透明性、柔韌性和可裁剪性，有望在柔性電子器件和智能結構等領域得到應用。