表面阻尼涂饰意杨单板的动态力学特性

为了开发防滑减振结构型胶合板,采用阻尼涂料对意杨单板进行表面涂饰处理,应用动态热机械分析技术,研究了意杨单板阻尼体系的动态力学特性,以构建具有自由型和约束型两种阻尼结构的新型木基阻尼结构体系。结果表明:①通过在意杨单板表面涂饰阻尼涂料构建意杨单板阻尼体系是可行的,该阻尼体系在常温环境下具有优异的阻尼性能。②涂层厚度对意杨单板阻尼体系的性能具有显著影响,损耗因子和有效阻尼温域均随阻尼涂料厚度的增加而增大,自由型阻尼涂料厚度为0.5～2.0 mm时,体系的损耗因子普遍高于0.10,峰值可超过0.30,约束型意杨单板阻尼体系在涂料厚度2.0 mm条件下损耗因子最大可达0.12。③意杨单板阻尼体系的动态力学行为与常规黏弹性高分子聚合物类似,满足温频等效机制。④采用阻尼涂料对意杨单板阻尼改性,自由型阻尼结构优于约束型阻尼结构。综合考虑,建议采用自由型阻尼结构,阻尼涂料厚度控制在1.5～2.0 mm。

Dynamic mechanical characteristics of poplar veneers painted with damping coatings

In order to develop wood-based damping plywood with anti-slip & vibration structural properties, damping coatings were used to treat poplar veneers. Two damping constructions, i.e., freedom and constrained, were tested. The dynamic mechanical properties of the veneer-based damping constructions were analyzed using the dynamic thermo-mechanical analysis(DMA)method. The research results showed that: ① Veneer-based damping constructions exhibited good damping performance at room temperature by applying damping coatings on veneer surface. ② The thickness of cured coating on veneer surface significantly influenced the damping performance, i.e., the thicker paint layer led to greater combined loss factor(η)and wider effective damping temperature range. With 0.5-2.0 mm thick freedom damping paints, η values were all greater than 0.10 with a peak greater than 0.30. Constrained veneer-based damping construction had the maximum η value of 0.12. ③ Veneer-based damping constructions had similar time-temperature superposition(TTS)behaviors to normal viscoelastic polymers.④ The freedom construction showed better damping performance than the constrained system. The aforementioned research findings are helpful for the manufacturing of the damping structural plywood. The research suggests to make damping structural plywood using the freedom construction with the 1.5-2.0 mm thick coating layer.