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首页> 外文期刊>Journal of Applied Polymer Science >Relation of swelling and T-g depression to the apparent free volume of a particle-filled, epoxy-based adhesive
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Relation of swelling and T-g depression to the apparent free volume of a particle-filled, epoxy-based adhesive

机译：溶胀和T-g降低与颗粒填充的环氧胶粘剂的表观自由体积的关系

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摘要

The effect of hygrothermal aging on a particle-filled, epoxy-based adhesive was studied using a gravimetric sorption technique. This study has explored moisture sorption characteristics as well as the associated behaviors of swelling and the depression of the glass transition temperature (T-g). We observed that the diffusion of water in this adhesive has a non-Fickian behavior, and the depression of T-g, proceeds to a definite value that is independent of the final equilibrium water content of the system. Our observations suggest that water diffuses into the polymer in a dual-sorption mode, in which water resides in two populations. In one population, water is considered to occupy apparent free volume of the adhesive, and the second population water infiltrates polymer structure and forms hydrogen-bonded clusters. Our results show that hygrothermal aging temperature and swelling do not alter the apparent free volume of this adhesive. We conclude that the constant value of T-g depression at saturation implies that only water in the apparent free volume is responsible for the T-g depression, whereas the swelling proceeds through the formation of hydrogen bonds in the adhesive. (C) 2002 Wiley Periodicals, Inc. [References: 32]
机译：使用重量吸收技术研究了湿热老化对颗粒填充的环氧基粘合剂的影响。这项研究探讨了湿气的吸收特性以及玻璃化转变温度（T-g）的膨胀和降低的相关行为。我们观察到水在这种粘合剂中的扩散具有非菲克行为，并且T-g的下降达到一个确定的值，该值与系统的最终平衡水含量无关。我们的观察结果表明，水以双吸附模式扩散到聚合物中，其中水存在于两个种群中。在一个种群中，水被​​认为占据了粘合剂的表观自由体积，而第二种群中的水渗入了聚合物结构并形成了氢键簇。我们的结果表明，湿热老化温度和膨胀不会改变该粘合剂的表观自由体积。我们得出的结论是，饱和状态下T-g凹陷的恒定值意味着仅表观自由体积中的水才导致T-g凹陷，而溶胀通过粘合剂中氢键的形成而继续进行。 （C）2002 Wiley Periodicals，Inc. [参考：32]

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