脲醛树脂橡胶填充木纤维复合材料的动态力学行为

IF 20.2 Q1 MATERIALS SCIENCE, PAPER & WOOD
Feiyu Tian, Xinwu Xu
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引用次数: 12

摘要

热固性合成树脂粘接的木质复合材料由于树脂基体固化,阻尼性能不佳。废橡胶保持了突出的弹性,是可行的可选改性剂。为此,本研究制备了颗粒化轮胎橡胶(GTR)粉末和热机械浆木纤维的复合板。采用脲醛树脂(脲醛树脂)作为粘结剂(根据木材/橡胶总重10%)。采用动态力学分析(DMA)揭示了橡胶填充木纤维复合材料的热力学行为。具体讨论了GTR粉粒度(0.55 ~ 1.09 mm)和添加量(按木/胶总重10%、20%、30%)这两个技术参数对GTR性能的影响。结果表明:随着温度的升高,橡胶填充复合材料的储存模量(E′)减小,损耗因子(tan δ)单调增大;在110 ~ 170℃之间存在稳定的“高原”区,E′和tan δ保持不变。因此,tan δ在103 ~ 108℃和231 ~ 233℃出现两个峰值,分别是由于木质素的玻璃化转变和半纤维素的热降解。橡胶填料的加入降低了弯曲强度和内部粘接强度以及存储模量值。当温度高于183℃时,所有橡胶填充复合材料的tan δ值均高于对照。以上研究结果充分说明了橡胶组分对uf -木纤维复合材料阻尼性能的改善。优化橡胶/纤维界面结合强度仍需进一步研究。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Dynamical mechanical behaviors of rubber-filled wood fiber composites with urea formaldehyde resin

Wood composites glued with thermosetting synthetic resins tend to show inadequate damping performance caused by the cured resinous matrix. Waste rubber maintains prominent elasticity and is feasible to be an optional modifier. To that end, composite panels of granulated tire rubber (GTR) powders and thermal-mechanically pulped wood fibers were fabricated in this study. Urea formaldehyde (UF) resin was applied as the bonding agent (10% based on wood/rubber total weight). Dynamical mechanical analysis (DMA) was conducted to disclose the thermo-mechanical behaviors of the rubber-filled wood fiber composites. Influence of two technical parameters, i.e., GTR powder size (0.55–1.09 mm) and addition content (10%, 20% and 30% based on wood/rubber total weight), was specifically discussed. The results showed that storage modulus (E') of the rubber-filled composite decreased while loss factor (tan δ) increased monotonously along with elevated temperature. A steady “plateau” region among 110–170 °C was found where both E' and tan δ keep constant. Accordingly, tan δ showed two peak values at 103–108 and 231–233 °C due to glass transition of lignin and thermal degradation of hemicellulose, respectively. Addition of rubber fillers resulted in lower bending and internal bonding strengths as well as storage modulus values. When the temperature was above 183 °C, all the rubber-filled composites showed higher tan δ values than the control. The findings above fully demonstrate the improved damping performance of the UF-bonded wood fiber composites on account of rubber component. Further work is still needed to optimize the rubber/fiber interfacial bonding strength.

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来源期刊
Journal of Bioresources and Bioproducts
Journal of Bioresources and Bioproducts Agricultural and Biological Sciences-Forestry
CiteScore
39.30
自引率
0.00%
发文量
38
审稿时长
12 weeks
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