In order to investigate the role of plant hybridization in barley on the overall thermomechanical performance of polymeric composites containing their by-products, straws from one self-pollinated (Quench) and two F1 hybrid lines of barley (Tatoo and Zoo) were collected and characterized from the chemical (FTIR), structural (XRD), thermal (TGA) and mechanical (tensile) point of view, and used as reinforcements in a commodity plastic, such as polypropylene. XRD characterization confirmed a crystallinity index (CrI) equal to 57.59 % for the self-pollinated Quench straw, while the two hybrid lines showed slightly higher values (CrI of 61.55 % and 62.29 % for Tatoo and Zoo, respectively). TGA characterization showed an improved thermal stability for the cellulose fractions of the hybrid lines (Zoo and Tatoo) in comparison with the Quench straw, while FESEM investigation of the longitudinal external surfaces and cross sections showed a not uniform dense structure with variable thickness for the three lines, which contributed to a variable mechanical performance of the cereal straws. We found that hybrid lines possess slightly higher Young’s modulus and tensile strength in comparison with self-pollinated Quench. Different mechanical response of the stem led to a higher stiffness for PP composites reinforced with hybrid lines, while tensile strength was not significantly affected by the barley straw line. The incorporation of 5 wt% of MAPP coupling agent improved both tensile strength and modulus of the composites, due to an increased interfacial adhesion between the barley straw fibres and the PP matrix.

为了研究植物杂交在大麦中对包含其副产物的聚合物复合材料的总体热机械性能的作用，收集并鉴定了来自一种自花授粉（淬灭）和两个F1大麦杂交系（Tatoo和Zoo）的秸秆从化学（FTIR），结构（XRD），热（TGA）和机械（拉伸）角度来看，并用作商品塑料（例如聚丙烯）的增强材料。XRD表征证实自花授粉的Quench稻草的结晶度指数（CrI）等于57.59％，而两条杂交品系的结晶度指数略高（Tatoo和Zoo的CrI分别为61.55％和62.29％）。TGA表征显示，与Quench秸秆相比，杂交品系（Zoo和Tatoo）的纤维素级分的热稳定性有所提高，FESEM对纵向外表面和横截面的调查显示，这三条生产线的厚度不一而致密，结构不均一，致使谷物秸秆的机械性能发生了变化。我们发现，与自花授粉淬灭相比，杂种系具有略高的杨氏模量和拉伸强度。茎部的不同机械响应导致杂化线增强的PP复合材料具有更高的刚度，而大麦秸秆线并未显着影响拉伸强度。由于大麦秸秆纤维与PP基质之间的界面粘合性的增加，掺入5重量％的MAPP偶联剂改善了复合材料的拉伸强度和模量。