BaTiO_3纳米粉/COPU IPNs复合体系的制备及力学性能研究

Preparation and Mechanical Properties of BaTiO_3Nanometer Powder/COPU Based IPNs Nanocomposites

采用'同步法'制备了一系列室温固化型蓖麻油聚氨酯/聚甲基丙烯酸甲酯互穿聚合物网络,进而制得其梯次化涂层材料,通过原料分析、TMA的温度—形变检测及TEM对相间形貌和相容性的检测结果表明:所获为两相间相畴尺寸在纳米级范围的互穿聚合物网络体系,且随相间混容程度的增加,体系玻璃化转变温区的有效衔接也有所增强.IPNs及其BaTiO3复合体系的力学性能检测结果表明,随聚甲基丙烯酸甲酸含量的增加,IPNs体现出弹性体向脆性变化的形变规律,在此基础上,选择具有良好压电特性的钛酸钡纳米粉对此网络体系进行复合,确定了复合工艺并对其力学性能进行了检测.复合体系的力学性能随BaTiO3复合量的增加而略有降低.

A series of castor oil polyurethane/poly(methyl methacrylate) interpenetrating polymer networks(IPNs) and gradient IPNs cured at room temperature were prepared in a 'simultaneous' way. The polymerization process are analysed through selection of materials. The examination results of morphology and miscibility of multi-phases of materials by TEM and TMA indicated that the Tg of systems are linked up and the domain between two phases are controlled in the range of nanometer scale. Furthermore, the systems are mixed with selected BaTiO3 nanometer powders, and the composite techniques are determined. Also, the mechanical properties of IPNs, gradient IPNs and nanocomposts are discussed in details.The mechanical properties detection results of IPNs and its composites indicate that the system exhibit a shape changing from elastomer to brittle plastios and the mechanical properties of composites decrease slightly with the increasing adding cmount of BaTiO3.