ABSTRACT

The structural integrity of wood–polymer composites (WPC) has not been fully investigated, which can be attributed to a lack of applicable test procedures. In this study, wood–polypropylene composites were assessed by High-Energy Multiple Impact (HEMI) testing. The acquired composites were based on wood particles from various sources and different wood fibre contents, respectively. With respect to wood fibre content, a clear relationship between resistance to impact milling (RIM) and unnotched impact bending strength (a_cU) was obtained. The lower the fibre content of the WPC the more structural integrity was retained. In return, various wood sources had no effect on a_cU, but a major impact on RIM values. RIM is suggested to be predominantly affected by structural features, such as fibre/particle content and characteristics, particle agglomerations, and spatial void distribution.

摘要

木材-聚合物复合材料 (WPC) 的结构完整性尚未得到充分研究，这可归因于缺乏适用的测试程序。在这项研究中，木聚丙烯复合材料通过高能多重冲击 (HEMI) 测试进行评估。获得的复合材料分别基于来自不同来源和不同木纤维含量的木屑。关于木纤维含量，获得了抗冲击铣削性 (RIM) 和无_缺口冲击弯曲强度 ( a _cU )之间的明确关系。WPC 的纤维含量越低，保持的结构完整性就越多。作为回报，各种木材来源有没有影响一_铜，但对 RIM 值有重大影响。建议 RIM 主要受结构特征的影响，例如纤维/颗粒含量和特性、颗粒团聚和空间空隙分布。