The durability of hemp fibers reinforced polypropylene biocomposites was investigated after one year under glass exposure. Volatile organic compounds emissions were assessed using a new passive sampling method. Degradation pathways were examined in order to understand the weathering mechanisms. The polymer matrix was decomposed into oxygenated products due to UV rays and high temperatures. As regards hemp fibers, different degradation steps of the carbohydrates were highlighted according to the nature of the detected furans. At a non-weathered state, dehydrations preceded the ring-opening mechanism, often catalyzed by Maillard reactions. The further cyclization induced the formation of 2- or 5-substituted furans emitted by non-weathered materials. Reactions between identified products after weathering which were not yet found in literature were proposed in this paper. They often implied a keto-enol tautomerism but also dehydrations that induced the formation of 3- and 4-substituted furanones. These differences can be explained by a primary decomposition of carbohydrates favored at a non-weathered state and a secondary one occurring at a weathered state.

在暴露于玻璃下一年后，研究了大麻纤维增强聚丙烯生物复合材料的耐久性。使用新的被动采样方法评估了挥发性有机化合物的排放。检查了降解途径以了解风化机理。由于紫外线和高温，聚合物基体分解成含氧产物。关于大麻纤维，根据检测到的呋喃的性质突出了碳水化合物的不同降解步骤。在非风化状态下，脱水通常先于美拉德反应催化开环机理。进一步的环化作用导致非风化物质释放出2或5取代的呋喃。本文提出了在风化后鉴定出的产物之间的反应，文献中尚未发现。他们通常暗示有酮-烯醇互变异构现象，但也暗示了脱水作用，导致3-和4-取代的呋喃酮的形成。这些差异可以通过在非风化状态下有利于碳水化合物的初级分解和在风化状态下发生次级的碳水化合物的分解来解释。