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首页> 外文期刊>Croatica Chemica Acta >Compensation Phenomena in β Relaxation of Novolac Phenol-Formaldehyde Resin. Influence of Water
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Compensation Phenomena in β Relaxation of Novolac Phenol-Formaldehyde Resin. Influence of Water

机译：酚醛清漆酚醛树脂β弛豫中的补偿现象。水的影响

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摘要

Novolačna fenol-formaldehidna smola istraživana je metodom termalno stimulirane depolarizacije, integralno i parcijalno, u području od 137 K do 270 K. Dva proširena maksimuma β_1 i β_2 pojavljuju se na oko 160 K i 190 K. Obavljena je analiza raspodjele aktivacijske energije E_a, u odnosu na T. Ustanovljena su tri relaksa-cijska područja i određene temperature izjednačenja (kompenzacijske točke), T_c. Prisutnost vode povećava polarizabilnost, smanjuje razlike u strukturi i olakšava gibanja u smoli. Utjecaj vode razmatra se u svjetlu pomaka T_c. Sva uočena gibanja pripisana su rotaciji fenilnih prstenova do kojih dolazi u različitim strukturnim okruženjima.%A novolac phenol-formaldehyde resin was investigated by thermally stimulated depolarization current using the integral and partial measurements in the temperature range from 137 K to 270 K. Two broadened peaks assigned as β_1 and β_2 appeared at about 160 K and 190 K. The influence of water was investigated. The analysis of the activation energy, E_a vs. T, and the search for compensation phenomena were performed. Three different regions in relaxations were distinguished and the related compensation temperatures (T_c) were determined. Contamination with water increases the polarizability, decreases the structure differences and relieves the motions in resin. The influence of water was discussed in the terms of the shifts of T_c's. All the motions were attributed to the rotation of the phenyl rings with different surrounding structures.
机译：通过热激发去极化的方法，对新型轻质酚醛树脂进行了整体和部分极化的研究，范围为137 K至270K。两个扩展的最大值β_1和β_2分别出现在160 K和190 K处。对活化能分布E_a的分析相对于T。建立了三个弛豫区和某些均衡温度（补偿点）T_c。水的存在增加了极化率，减少了结构差异并促进了树脂的运动。根据位移T_c考虑水的影响。所有观察到的运动均归因于在不同结构环境中发生的苯环的旋转。％酚醛清漆酚醛树脂通过热激发去极化电流，在137 K至270 K的温度范围内使用积分和部分测量进行了研究。两个加宽的峰分别指定为β_1和β_2的元素出现在160 K和190 K处。研究了水的影响。活化能的分析，E_a vs. T，并进行补偿现象的搜索。区分了弛豫的三个不同区域，并确定了相关的补偿温度（T_c）。用水污染会增加极化率，减小结构差异并减轻树脂中的运动。根据T_c的位移讨论了水的影响。所有的运动都归因于具有不同周围结构的苯环的旋转。

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