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首页> 外文期刊>Journal of Macromolecular Science. Pure and Applied Chemistry >Modification of the resistance of two epoxy resins to accelerated weathering using calcium sulfate as a photostabilizer
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Modification of the resistance of two epoxy resins to accelerated weathering using calcium sulfate as a photostabilizer

机译：用硫酸钙作为光稳定剂改变两种环氧树脂的抗性加速耐候

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Epoxy-timber composites have received increasing attention during the last decades because there are many advantages related to their uses as construction materials in applications such as timber bridges. However, the durability of epoxy-timber composites under outdoor conditions has become a concern for many epoxy resins. This study evaluated the chemical, thermal, and mechanical properties of two cured epoxies, the product of the diglycidyl ether of bisphenol A with 2,4-trimethyl-1,6-hexanediamine (DGEBA-TMDA) and the analogous resin prepared with the hydrogenated diglycidyl ether of bisphenol A (HDGEBA-TMDA), each mixed with 2 wt. % calcium sulfate (CS). We hypothesized that the use of CS, as an inorganic UV absorber, could decrease undesirable effects arising from exposure to UV light, moisture, and extreme temperatures. An accelerated aging chamber simulated natural weathering for 1, 2, 3, 4, and 6 months. Chemical changes in cured epoxy systems over time in the presence and absence of CS fillers were determined using Fourier transform infrared spectroscopy (FT-IR). Thermal degradation profiles before and after exposure to accelerated weathering were followed by thermogravimetric analysis (TGA). The glass transition temperatures (T-g) before and after accelerated weathering were measured, and the effect of accelerated weathering on the surface morphology of the epoxy systems was investigated by scanning electron microscopy (SEM). In the presence of CS, after 6 months accelerated weathering the tensile strength of DGEBA-TMDA reduced by 23.8 +/- 2.4%, compared to 46.5 +/- 5.5% in its absence, while the corresponding values for HDGEBA-TMDA were 21.4 +/- 2.1% and 28.7 +/- 1.8%.
机译：在过去的几十年中，环氧树脂 - 木材复合材料在过去几十年中受到了越来越长的关注，因为它们与木材桥牌等应用中的施工材料有关的许多优点。然而，户外条件下环氧树脂木材复合材料的耐久性已成为许多环氧树脂的关注。本研究评估了两种固化环氧树脂的化学，热和机械性能，双酚A的二甲基-1,6-己二胺（DGEBA-TMDA）和用氢化制备的类似树脂的二苯酚A的产品的产物双酚A（HDGEBA-TMDA）的二缩水甘油醚，各自与2wt混合。 ％硫酸钙（Cs）。我们假设使用CS作为无机紫外线吸收剂，可以降低暴露于UV光，水分和极端温度的不良影响。加速老化室模拟自然风化1,2,3,4和6个月。使用傅里叶变换红外光谱（FT-IR）测定固化环氧系统的化学变化随着CS填料的存在和不存在CS填充物。在暴露于加速风化之前和之后的热降解曲线随后是热重分析（TGA）。测量加速耐候之前和之后的玻璃化转变温度（T-G），通过扫描电子显微镜（SEM）研究了加速风化对环氧系统表面形态的影响。在CS的存在下，6个月后加速耐候DGEBA-TMDA的拉伸强度降低23.8 +/- 2.4％，而其缺失相比46.5 +/- 5.5％，而HDGEBA-TMDA的相应值为21.4 + / - 2.1％和28.7 +/- 1.8％。

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