The Effects of UV Light on the Chemical and Mechanical Properties of a Transparent Epoxy-Diamine System in the Presence of an Organic UV Absorber.
The Effects of UV Light on the Chemical and Mechanical Properties of a Transparent Epoxy-Diamine System in the Presence of an Organic UV Absorber.
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DOI：
10.3390/ma10020180
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发表时间：
2017-02-14
期刊：
影响因子：
--
通讯作者：
Naebe M
中科院分区：
文献类型：
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作者：
Nikafshar S;Zabihi O;Ahmadi M;Mirmohseni A;Taseidifar M;Naebe M
尽管环氧树脂具有多种优异的性能，包括低收缩率、良好的耐化学性、可在低温下固化以及不含副产物或挥发物，但环氧树脂容易受到紫外线 (UV) 损坏，并且当暴露于室外环境时，其耐用性会大大降低。为了克服这个缺点，通常使用紫外线吸收剂来降低紫外线降解率。在本研究中，研究了紫外线对固化环氧结构的化学、机械和物理性能的影响，以及有机紫外线吸收剂 Tinuvin 1130 对环氧性能的影响。使用傅里叶变换红外光谱 (FT-IR) 分析确定固化环氧树脂体系中是否存在 Tinuvin 1130 导致的化学变化。还通过扫描电子显微镜 (SEM) 成像研究了 Tinuvin 1130 对环氧体系表面形态的影响。此外，还测量了紫外线辐射之前和期间的玻璃化转变温度 (Tg)。经过 800 小时的紫外线辐射后，机械测试结果显示，缺少紫外线吸收剂会导致拉伸强度下降约 30%。然而，在 Tinuvin 1130 存在的情况下，拉伸强度仅降低约 11%。据推测，使用 Tinuvin 1130 作为环氧-胺体系中的有机紫外线吸收剂，可以减少因暴露于紫外线而产生的不良影响。
Despite several excellent properties including low shrinkage, good chemical resistance, curable at low temperatures and the absence of byproducts or volatiles, epoxy resins are susceptible to ultra violet (UV) damage and their durability is reduced substantially when exposed to outdoor environments. To overcome this drawback, UV absorbers have been usually used to decrease the rate of UV degradation. In this present study, the effects of UV light on the chemical, mechanical and physical properties of cured epoxy structure, as well as the effect of an organic UV absorber, Tinuvin 1130, on the epoxy properties were investigated. Chemical changes in a cured epoxy system as a result of the presence and absence of Tinuvin 1130 were determined using Fourier transform infrared spectroscopy (FT-IR) analyses. The effect of Tinuvin 1130 on the surface morphology of the epoxy systems was also investigated by scanning electron microscopy (SEM) imaging. Additionally, the glass transition temperatures (Tg) before and during UV radiation were measured. After an 800 h UV radiation, mechanical test results revealed that the lack of the UV absorber can lead to a ~30% reduction in tensile strength. However, in the presence of Tinuvin 1130, the tensile strength was reduced only by ~11%. It was hypothesized that the use of Tinuvin 1130, as an organic UV absorber in the epoxy-amine system, could decrease the undesirable effects, arising from exposure to UV light.