基于TD-NMR的PMMA木塑复合材吸湿和吸水研究
Study on Moisture Absorption and Water Absorption of PMMA Wood-plastic Composites Based on TD-NMR
Received date: 2023-02-28
Online published: 2023-06-16
本研究采用时域核磁共振（TD-NMR）技术探究聚甲基丙烯酸甲酯（PMMA）木塑复合材在吸湿与吸水过程中水分的状态和自旋-自旋弛豫（T2）特征．并比较PMMA木塑复合材的阻湿率和拒水率，分析PMMA木塑复合材的阻湿和防水性能与原理．研究对象为浸渍甲基丙烯酸甲酯（MMA）单体聚合生成的PMMA木塑复合材．首先对绝干的PMMA木塑复合材进行核磁共振T2检测，然后分别进行吸湿和吸水实验，并每隔一段时间测定试件质量及其T2信号量．结果表明：PMMA木塑复合材的吸湿率和吸水率低于未处理材，具有良好的阻湿和防水性能，且MMA浸渍浓度为100%，浸渍时间为24 h时，在温度为 (40±0.2) ℃相对湿度为 (96.4±0.4)%恒温恒湿环境下木塑复合材吸湿率低于15%，常温下吸水试件的吸水率低于30%．PMMA木塑复合材的吸湿率和吸水率明显降低，T2峰面积也逐渐减小．这说明木塑复合材内部的PMMA起到了防止水分进入的作用．
赵万磊 , 赵芝弘 , 张明辉 , 刘文静 . 基于TD-NMR的PMMA木塑复合材吸湿和吸水研究[J]. 波谱学杂志, 2023 , 40(4) : 448 -461 . DOI: 10.11938/cjmr20233054
In this study, time-domain nuclear magnetic resonance (TD-NMR) technology was employed to explore the moisture state and spin-spin relaxation (T2) characteristics of polymethyl methacrylate (PMMA) wood-plastic composites during the moisture absorption and water absorption process. The moisture resistance and water repellency of PMMA wood-plastic composites were compared and analyzed. The experimental samples were PMMA wood-plastic composite material produced by impregnated methyl methacrylate (MMA) monomer polymerization. Firstly, the NMR T2 test was carried out on the dry PMMA wood-plastic composite, and then the moisture absorption and water absorption experiments were carried out respectively, and the mass of the specimen and its T2 signal were measured at intervals. The results showed that the moisture absorption rate and water absorption rate of PMMA wood-plastic composite were lower than those of untreated wood, and PMMA had good moisture resistance and water resistance. When the impregnation concentration of MMA was 100 % and the impregnation time reached 24 h, the moisture absorption rate of wood-plastic composites was lower than 15% under the constant temperature of (40±0.2)℃ and relative humidity of (96.4±0.4)%, and the water absorption rate of water-absorbing specimens at room temperature was lower than 30%. At the same impregnation time, with the increase of impregnation concentration of MMA, the moisture absorption rate and water absorption rate of PMMA wood-plastic composites decreased significantly, and the T2 peak area decreased gradually. This indicates that the PMMA inside the wood-plastic composite material contributes to preventing water from entering.
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