The viscoelastic properties of semi-conductive UV cured urethane acrylate/silicon carbide nanocomposites (UV-PUA/SiC) containing 0.1, 0.3, 0.6, 1, 3, and 5% (wt) of SiC are studied. Scanning electron microscopy (SEM) was employed to examine the state of the spatial distribution of SiC particles in the matrix. In conjunction with the electron microscopy technique, dynamic mechanical thermal analysis (DMTA) was employed as an indirect tool for the microstructure characterization and evaluation of the network heterogeneity and cross-link density of the nanocomposites. The influence of SiC nanoparticles on the storage modulus, loss modulus, cross-link density, glass transition temperature, and activation energy for glass transition of the UV-PUA matrix are investigated. The effect of SiC content on the network structures and degree of curing of the nanocomposites was evaluated by William-Landel-Ferry (WLF) constants. The breadth of the glass transition in the tanδ curve and shape parameter (β) in the Kolrausch-Williams-Watts (KWW) equation were used to investigate the network heterogeneity of the samples. All these referred parameters increased with SiC nanoparticles loading up to 0.6% (wt). In contrast, upon introducing SiC at higher concentrations, the viscoelastic properties of the nanocomposites reduced significantly. SEM analysis was used to evaluate the DMTA results regarding the dispersion state of the nanoparticles in the matrix.

研究了含有0.1、0.3、0.6、1、3和5％（wt）的SiC的半导电UV固化聚氨酯丙烯酸酯/碳化硅纳米复合材料（UV-PUA / SiC）的粘弹性能。扫描电子显微镜（SEM）用于检查基质中SiC颗粒的空间分布状态。结合电子显微镜技术，动态机械热分析（DMTA）被用作间接工具，用于纳米结构的微观结构表征和网络异质性和交联密度的评估。研究了SiC纳米颗粒对UV-PUA基体的储能模量，损耗模量，交联密度，玻璃化转变温度和玻璃化转变活化能的影响。通过William-Landel-Ferry（WLF）常数评估了SiC含量对网络结构和纳米复合材料固化程度的影响。棕褐色玻璃过渡的宽度使用Kolrausch-Williams-Watts（KWW）方程中的δ曲线和形状参数（β）来研究样品的网络异质性。所有这些引用的参数随SiC纳米颗粒负载量增加至0.6％（wt）而增加。相反，当以更高的浓度引入SiC时，纳米复合材料的粘弹性特性显着降低。用SEM分析评价了纳米粒子在基质中的分散状态的DMTA结果。