The effect of chain extension method on the properties of polyurethane/SiO₂ composites

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• 作者：Zhiping Lv ; ^{lvzhiping@tyut.edu.cn} ; Xiaoning Li ; Xiang Yu
• 刊名：Materials and Design
• 出版年：2012
• 期刊代码：56_02613069
• 类别：ms
• 出版时间：March, 2012
• 卷：35
• 期：Complete
• 页码：358-362
• 文件大小：670 K

摘要

The polyurethane (PU)/SiO₂ composites with diverse microstructure were obtained with different chain extension methods by pre-polymerization method. The composites with multitudinous crosslink density micro-domains were denoted as PUm/SiO₂ composites, the other were denoted as PUh/SiO₂ composites. The microstructure and the properties of PUm/SiO₂ and PUh/SiO₂ composites were investigated. The results showed that the particles of SiO₂ were well-dispersed in PU matrix. It was demonstrated that the mechanical properties of PUm/SiO₂ composites had optimal tear strength and maintained similar tensile strength in comparison with PUh/SiO₂ composites. Scanning electron microscope (SEM) photographs indicated that the tensile sectional morphology of PUm/SiO₂ composites was presented complex without rules, which verified that the PUm/SiO₂ composites had better fracture toughness and strength. Differential scanning calorimetry (DSC) studies suggested a better micro-phase separation of soft and hard segments in PUm/SiO₂ composites. Besides, the PUm/SiO₂ composites had excellent solvent resistance performance.