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首页> 外文期刊>Journal of Applied Polymer Science >Structure and property of polyurethane/SiO_2 composite elastomer prepared via in situ polymerization
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Structure and property of polyurethane/SiO_2 composite elastomer prepared via in situ polymerization

机译：原位聚合制备聚氨酯/ SiO_2复合弹性体的结构与性能

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摘要

A series of polyurethane (PU)/SiO_2 composites were prepared via in situ polymerization through a prepolymer process. The effect of SiO 2 content on mechanical and solvent-resistant properties of PU/SiO_2 composites was investigated. It was found that with increasing SiO_2 content, the tensile strength and toughness, hardness, and modulus of PU composites increased. PU/SiO_2 composites exhibited only one loss peak corresponding to the glass transition temperature of the soft-segment of PU, which shifted insignificantly with increasing SiO_2 content. The equilibrium swelling ratio and swelling rate constant in cyclohexanone and xylene were reduced by increasing SiO_2 content, indicating the enhancement of the solvent resistance of the PU elastomer. Morphology observation of PU/SiO_2 composites showed that the acicular SiO_2 dispersed uniformly in PU matrix, and there was no obvious aggregation even at 9 wt % loading of SiO_2. The reinforcing and toughening effects depended largely on the dispersion of SiO_2 in PU matrix and the interfacial layer formed between the two phases.
机译：通过预聚物原位聚合制备了一系列聚氨酯（PU）/ SiO_2复合材料。研究了SiO 2含量对PU / SiO_2复合材料力学性能和耐溶剂性能的影响。发现随着SiO_2含量的增加，PU复合材料的拉伸强度和韧性，硬度和模量增加。 PU / SiO_2复合材料仅表现出一个与PU软段的玻璃化转变温度相对应的损耗峰，该损耗峰随SiO_2含量的增加而无明显变化。 SiO_2含量的增加降低了环己酮和二甲苯的平衡溶胀率和溶胀速率常数，表明PU弹性体的耐溶剂性增强。 PU / SiO_2复合材料的形态观察表明，针状SiO_2在PU基体中均匀分散，即使在SiO_2含量为9wt％时也没有明显的团聚现象。增强和增韧效果主要取决于SiO_2在PU基体中的分散以及两相之间形成的界面层。

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