Dongxia Zhang,Juntao Zeng,Shengtao Zhu,Hao Ma,Xiaoxi Kang,Li Lou,Zemin He
In this work, two silicon nanomaterials are doped into polymer/liquid crystal composites by a facile method. SEM and FT-IR characterizations indicate that SiO 2 -SH and synthesized thiol polyhedral oligomeric silsesquioxane (POSS-SH) have been successfully implanted into PDLCs successfully. The electro-optical tests imply that the electro-optical performance of PDLC films can be greatly enhanced by doping proper amounts of SiO 2 -SH nanoparticles and nanostructured POSS-SH into the polymer matrix . The driving voltage can be reduced by nearly 78.2% if the concentration of SiO 2 -SH is 4 wt%; whereas only nearly 60% driving voltage is reduced when 4 wt% POSS-SH is doped into system, indicating better electric-optical performance regulation effect of SiO 2 . The lower driving voltage of SiO 2 -SH doped PDLC samples may be due to the existence of high content –SH on the surface of nanoparticles, which can conduct click reactions with acrylate bond under the effect of initiator.
Panpan Zhang,Susu Xing,Zibo Lin,Zhenxia Zhao,Hao Kong,Jing Li
Based on the high chemical stability and excellent end-group functionalization capability of polyhedral oligomeric silsesquioxane (POSS), this study utilized thiol-functionalized POSS (POSS-SH) in a click chemistry reaction with styrene-butadiene-styrene triblock copolymer (SBS). The objective was to design a functional group forming a chemical bond with the polymer matrix, resulting in the preparation of thiol-functionalized polyacrylonitrile (PAN) fibers chemically cross-linked with POSS-SH/PAN/SBS hybrid material. This hybrid material not only enhanced the compatibility between the components but also facilitated a connection between the fiber and SBS, thereby improving the mechanical properties of the modified asphalt. Fourier transform infrared spectroscopy, field emission scanning electron microscopy (FESEM), and atomic force microscopy analyses confirmed the successful modification of POSS-SH/PAN fibers. FESEM analysis of the modified asphalt verified that POSS-SH/PAN fibers contributed to strengthening the interfacial performance between the fiber and asphalt. Cone penetration and dynamic shear rheometer tests indicated that, compared to SBS-modified asphalt, PAN/SBS and POSS-SH/PAN/SBS-modified asphalt exhibited enhanced shear strength, deformation resistance, and viscoelastic properties. Additionally, at 46°C, the storage modulus (G′) of 1.5% POSS-SH/PAN/SBS-modified asphalt increased by 11% compared to 1.5% PAN/SBS asphalt, with increases of 13.75% and 10.8% in loss modulus (G″) and complex modulus (G*), respectively.
危险品化学品经营许可证（带存储）