Kairytė Agnė, Šeputytė-Jucikė Jurga, Członka Sylwia, Vėjelis Sigitas, Vaitkus Saulius
Laboratory of Thermal Insulating Materials and Acoustics, Institute of Building Materials, Faculty of Civil Engineering, Vilnius Gediminas Technical University, Linkmenų st. 28, 08217 Vilnius, Lithuania.
Institute of Polymer & Dye Technology, Lodz University of Technology, 90-924 Lodz, Poland.
Polymers (Basel). 2023 Feb 6;15(4):818. doi: 10.3390/polym15040818.
In the current study, biopolyurethane foam was modified with 2.5-10 wt.% lignin waste (LigW) and liquid glass (LG)-modified LigW particles at different LigW/LG ratios-1:1 and 1:2-and their impact on performance characteristics-i.e., rheology, foaming times, apparent density, thermal conductivity before and after aging, dimensional stability at ambient and elevated conditions, compressive and tensile strengths, short-term water absorption by partial immersion, and water vapor permeability-was determined and evaluated. Structural analysis was implemented and structural parameters were taken into consideration as well. During the study, it was determined that 2.5-10 wt.% particles at the LigW/LG ratio of 1:2 showed a superior impact on the physical and mechanical properties of bioPUR foams. The apparent density only insignificantly increased and was in a density range suitable for commercially available polyurethanes. For particles at 10 wt.% and LigW/LG ratio of 1:1, the thermal conductivity value improved by 3.2%, the compressive strength increased by 153%, while the tensile strength improved by 23.5%, indicating sufficient interfacial adhesion between the filler and polymer matrix. Moreover, the short-term water absorption by partial immersion remained almost unchanged, while the water vapour diffusion resistance factor improved from 43 to 48. Additionally, the incorporation of LigW/LG 1:1 and LigW/LG 1:2 particles made it possible to obtain dimensionally and structurally stable closed-cell bioPUR foams for possible application as thermal insulation in building envelopes.
在本研究中，生物聚氨基甲酸酯泡沫用2.5 - 10重量%的木质素废料（LigW）和液体玻璃（LG）改性的LigW颗粒进行改性，LigW/LG比例分别为1:1和1:2，研究了它们对性能特征的影响，即流变学、发泡时间、表观密度、老化前后的热导率、环境和高温条件下的尺寸稳定性、抗压强度和抗拉强度、部分浸入的短期吸水率以及水蒸气透过率，并进行了评估。同时进行了结构分析并考虑了结构参数。研究过程中发现，LigW/LG比例为1:2的2.5 - 10重量%颗粒对生物聚氨基甲酸酯泡沫的物理和机械性能有优异影响。表观密度仅略有增加，且处于适合市售聚氨酯的密度范围内。对于10重量%且LigW/LG比例为1:1的颗粒，热导率值提高了3.2%，抗压强度提高了153%，而抗拉强度提高了23.5%，表明填料与聚合物基体之间有足够的界面粘附力。此外，部分浸入的短期吸水率几乎保持不变，而水蒸气扩散阻力因子从43提高到48。此外，加入LigW/LG 1:1和LigW/LG 1:2颗粒使得能够获得尺寸和结构稳定的闭孔生物聚氨基甲酸酯泡沫，有可能用作建筑围护结构中的隔热材料。
