Polymer nanocomposites have improved mechanical, optical and thermal properties compared to traditional thermoplastics. To study the impact of grafted brush–matrix interactions on the mechanical properties of nanoparticle filled polymers, uniaxial tensile testing with digital image correlation (DIC) was done on polystyrene (PS) grafted SiO₂ in low molecular weight (MW) (N ∼ P), N = degree of polymerization of grafted brush, P = degree of polymerization of matrix, and high MW (2N = P) matrices at different loadings. The low matrix MW composites had higher strength than high MW composites at high loading but lower strength than the pure matrix. The high matrix MW composites had higher toughness at low loadings. SEM images of fracture surfaces revealed particle debonding and plastic void growth in the high toughness samples. The results show that the P/N ratio of polymer grafted nanoparticle composites is important for controlling the mechanical properties of polymer nanocomposites.

与传统的热塑性塑料相比，聚合物纳米复合材料具有改善的机械，光学和热学性能。为了研究接枝刷-基质相互作用对纳米颗粒填充聚合物，与数字图像相关（DIC）单轴拉伸测试的机械性质的影响是对聚苯乙烯进行（PS）接枝的SiO ₂中的低分子量（MW）（Ñ〜P），N =接枝刷的聚合度，P =基质的聚合度，高分子量（2 N  =  P）在不同负载下的矩阵。在高负荷下，低基质MW复合材料的强度高于高MW复合材料，但强度低于纯基质。高基体MW复合材料在低负荷下具有较高的韧性。断裂表面的SEM图像显示了高韧性样品中的颗粒剥离和塑性空隙的增长。结果表明，聚合物接枝纳米颗粒复合材料的P / N比对于控制聚合物纳米复合材料的力学性能很重要。