Abstract：
Biocomposite boards (BcBs) composed of hemp shives and corn starch are known as thermal insulating or structural building materials. Therefore, they must be stable during exploitation. However, BcBs are exposed to microorganisms present in the environment, and it is of great interest to investigate the biodegradation behaviour of these materials. This work identified microorganisms growing on BcBs that contain either Flovan CGN or expandable graphite as flame retardants and selected fungi such as Rhizopus oryzae and Aspergillus fumigatus to test the way they affect the materials of interest. For this purpose, the enzymatic activity of cellulases and amylases produced by these organisms were determined. In addition, the apparent density as well as compressive strength of the affected boards were evaluated. The results showed that apparent density and compressive strength deteriorated in BcB composition with the Flovan CGN flame retardant. At the same time, the level of deterioration was lower when the expandable graphite was used, suggesting that it also acts as an antimicrobial agent. A scanning electronic microscopy analysis was employed to monitor the growth of microorganisms in the BcBs. Such analysis demonstrated that, regardless of BcB composition, fungi easily penetrate into the middle layers of the material.
摘要：
由大麻片和玉米淀粉组成的生物复合板（BcB）被称为隔热或结构建筑材料。因此,他们必须在开发过程中保持稳定。然而,BcBs暴露于环境中存在的微生物，研究这些材料的生物降解行为非常有意义。这项工作确定了在含有FlovanCGN或可膨胀石墨作为阻燃剂的BcBs上生长的微生物，以及选定的真菌，如米根霉和烟曲霉，以测试它们对目标材料的影响方式。为此,测定了由这些生物体产生的纤维素酶和淀粉酶的酶活性。此外,评估了受影响板的表观密度和抗压强度。结果表明，含有FlovanCGN阻燃剂的BcB组合物的表观密度和抗压强度下降。同时,当使用可膨胀石墨时，劣化水平较低，这表明它也可以作为抗菌剂。采用扫描电子显微镜分析来监测BcB中微生物的生长。这样的分析表明,无论BcB组成如何，真菌很容易渗透到材料的中间层。
