一种用于玻璃即时修复的商用聚氰丙烯酸酯胶粘剂的热处理及其耐老化性能的研究

Macromol Pub Date : 2023-09-04 DOI:10.3390/macromol3030035
Evangelia C. Vouvoudi, George A. Tamias, Evangelia A. Chatzicharistou, D. Achilias
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引用次数: 0

摘要

在本研究中,介绍了应用于玻璃表面的商用恢复性粘合剂乐泰®Super攻击型玻璃的耐热性和分解产物的实验结果。氰基丙烯酸酯聚合物的透明度和快速的阴离子聚合反应是单体化学性质和活性的结果。首先,通过溶解度试验对该胶的可逆性进行了评价。经验证,该胶粘剂在几种溶剂中稀释后具有可逆性。然后,通过热解结合气相色谱和质谱(Py-GC /MS),记录聚合物的热谱,记录其整洁状态和老化状态(在50°C和75°C的紫外线照射或热处理影响下风化)。对分解产物进行检测和鉴定,最后对可能的反应进行研究。重点放在那些可能被认为对文化遗产材料和物体有害的东西上。通过热解反应鉴定的碎片主要是酯类,较少的醛类和醇类,小的氮化合物,在某些情况下还有较大分子量的不饱和烃。还检测到自由基聚合抑制剂和稳定剂等添加剂以及一些增塑剂。
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Thermal Treatment of a Commercial Polycyanoacrylate Adhesive Addressed for Instant Glass Restoration, for Investigating Its Ageing Tolerance
In the present study, the results of an experimental work on the thermal endurance and decomposition products of the commercial restorative adhesive Loctite® Super Attak Glass, being applied on glass surfaces, are presented. The clarity of the cyanoacrylate polymer and its rapid anionic polymerization reaction are outcomes of the chemistry of the monomer and its activity. First, evaluation of the reversibility of this glue was examined through the solubility tests. It was verified that the adhesive is reversible since it is diluted in several solvents. Later, by applying pyrolysis conjugated with gas chromatography and mass spectrometry (Py–GC/MS), the thermal profile of the polymer is recorded in its neat form and in its aged state (weathered under the influence of UV-irradiation or thermal treatment at 50 and 75 °C). The decomposition products are detected and identified and, finally, possible reactions are investigated. Emphasis is placed on those that could be considered harmful to cultural heritage materials and objects. The fragments by the pyrolytic reactions identified mainly concern esters, less aldehydes and alcohols, small nitrogen compounds, and in some cases unsaturated hydrocarbons with higher molecular weight. Additives such as radical polymerization inhibitors and stabilizers, as well as some plasticizers, were also detected.
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