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首页> 外文期刊>Journal of Applied Polymer Science >Rubber-elasticity of hybrid organic-inorganic composites evaluated using dynamic mechanical spectroscopy and equilibrium swelling
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Rubber-elasticity of hybrid organic-inorganic composites evaluated using dynamic mechanical spectroscopy and equilibrium swelling

机译：动态力学光谱法和平衡溶胀法评估有机-无机杂化复合材料的橡胶弹性

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Estimations of the average molar mass between crosslinks for sol-gel-derived poly(tetramethylene oxide) (PTMO)-polysilicate hybrid composites have been made using both dynamic tensile modulus and equilibrium swelling techniques. Modulus-based calculations have been performed using storage modulus values obtained from dynamic mechanical spectroscopy at frequencies ranging from 0.1 to 10 Hz. The analysis revealed that gels containing either 4 or 19% polysilicate (by volume) had an average molar mass between crosslinks significantly less than that predicted by a PTMO and SiO2 rule of mixtures. Thus, the analysis indicates that there is extensive restriction of PTMO chain mobility in these gels. Aging of the 19% polysilicate-loaded gels in a basic ethylamine and water solution for 25 h, which has previously been shown to enhance phase separation without loss of optical transparency, results in increasing average chain length. To verify this approach, the values obtained using the dynamic mechanical spectroscopy-based technique were compared with those calculated using the Flory-Rehner equation. Somewhat surprisingly, the analyses by both techniques were in excellent agreement, thereby suggesting that, in the absence of chemical change, elementary rubber elasticity theory is a good tool for investigating the phase interactions in these seemingly nonideal hybrid composites. (C) 1998 John Wiley & Sons, Inc. [References: 42]
机译：使用动态拉伸模量和平衡溶胀技术对溶胶-凝胶衍生的聚四氢呋喃（PTMO）-聚硅酸盐杂化复合材料的交联之间的平均摩尔质量进行了估算。已经使用从动态机械光谱学获得的储能模量值以0.1至10 Hz的频率进行了基于模量的计算。分析表明，含有4％或19％聚硅酸盐（按体积计）的凝胶，其交联之间的平均摩尔质量显着小于混合物的PTMO和SiO2规律所预测的质量。因此，分析表明在这些凝胶中PTMO链的迁移受到很大的限制。在碱性乙胺和水溶液中将含19％聚硅酸盐的凝胶老化25小时（以前已证明可增强相分离而不损失光学透明性），这会导致平均链长增加。为了验证这种方法，将使用基于动态机械光谱学的技术获得的值与使用Flory-Rehner方程计算的值进行了比较。出乎意料的是，两种技术的分析都非常吻合，从而表明，在没有化学变化的情况下，基本橡胶弹性理论是研究这些看似非理想的杂化复合材料中相相互作用的良好工具。 （C）1998 John Wiley＆Sons，Inc. [参考：42]

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