College of Materials Science and Engineering, Nanjing Tech University, Nanjing 211816, China.
College of Materials Science and Engineering, Nanjing Tech University, Nanjing 211816, China.
Int J Biol Macromol. 2024 May;266(Pt 2):131313. doi: 10.1016/j.ijbiomac.2024.131313. Epub 2024 Apr 1.
In recent years, considerable attention has been given to the utilization of biomass for producing bio-based foams, such as starch-based foams. Despite their renewability and widespread availability, these foams still present certain drawbacks regarding their poor mechanical properties and flammability. To tackle these concerns, a metal ion cross-linking strategy was employed by incorporating calcium ions (Ca) solution into foamed starch/cellulose slurry. Followed by ambient drying, starch/cellulose composite foam was successfully fabricated with a remarkable enhancement in various properties. Specifically, compared to the control sample, the compressive strength and modulus increased by 26.2 % and 123.0 %, respectively. Additionally, the Ca cross-linked starch/cellulose composite foam exhibited excellent heat resistance, water stability, and flame retardancy. The limiting oxygen index (LOI) reached 52 %, with a vertical combustion rating of V-0. Along with the addition of 2 phr diatomite, it demonstrated a significant enhancement on flame retardancy with a LOI of 65 %, although the apparent density of the composite foam was not low enough. This study indicated a green and simple method to obtain starch-based composite foams with enhanced comprehensive properties including thermal, water stability, mechanical, and flame retardancy, expanding their potential applications in areas such as building materials and rigid packaging.
近年来，人们对利用生物质生产生物基泡沫材料给予了极大的关注，如淀粉基泡沫。尽管这些泡沫具有可再生性和广泛的可用性，但它们的机械性能和可燃性仍然存在一些缺陷。为了解决这些问题，采用金属离子交联策略，将钙离子（Ca）溶液掺入泡沫淀粉/纤维素浆料中。随后在环境温度下干燥，成功制备了淀粉/纤维素复合泡沫，其各种性能得到显著提高。具体来说，与对照样品相比，压缩强度和模量分别提高了 26.2%和 123.0%。此外，Ca 交联的淀粉/纤维素复合泡沫具有优异的耐热性、耐水性和阻燃性。极限氧指数（LOI）达到 52%，垂直燃烧等级为 V-0。随着 2 phr 硅藻土的添加，其阻燃性能显著提高，LOI 达到 65%，尽管复合泡沫的表观密度不够低。本研究表明了一种绿色简单的方法来获得淀粉基复合泡沫，具有增强的综合性能，包括热稳定性、耐水性、机械性能和阻燃性，扩大了它们在建筑材料和刚性包装等领域的潜在应用。
