In present study, part of poplar wood flours (WF) was replaced by larix gmelini bark flours (BF) and the BF/WF/high density polyethylene (HDPE) composites were prepared by extrusion method .The flexural performances, tensile properties, impact and rheological properties of the resulting composite were tested .The study found that bark less than 10 weight part had no sig-nificantly effect on these properties , however , bark four of more than 10 weight part decreased the mechanical properties of WF /BF/HDPE composite .Addition of bark flowers could improve the fluidity of BF/WF/HDPE mixture and the efficiency of production .Va-riance analysis found that compared with composite by addition of 0 bark flowers, bending modulus, tensile strength and tensile modu-lus of materials were not significantly affected by 10 weight part .Rotating rheological tests showed that storage modulus and complex viscosity of melts reduced with the increasing of bark flours usage .When bark weight part was more than 20, the storage modulus and complex viscosity among each composite group were similar , respectively .Equilibrium temperature and equilibrium torque of WF /BF/HDPE composites increased with bark raising .

依据GB/T 18102-2007《浸渍纸层压木质地板》及JJF 1059.1-2012《测量不确定度评定与表示》规定,对浸渍纸层压木质地板样品的吸水厚度膨胀率不确定度来源进行分析和量化,提出了吸水厚度膨胀率不确定度的评定方法.

生物质纤维/塑料微孔发泡复合材料是一种新型复合材料,通过在复合材料内引入大量的微孔进行增韧改性,使材料在密度降低的同时提高部分物理力学性能,如耐冲击性、延展性、抗疲劳性和热稳定性等.

The brief information and features of the key raw materials of wood/plastic composites,i.e. plant fiber,plastics and compatibilizer,are introduced,based on which,the development status of various kinds of wood/plastic composites at home and abroad is summarized.

通过分析2个结构单板层积材国家标准,简述了结构单板层积材标准框架及技术内容对比,介绍了结构单板层积材足尺检测和评价方法及尺寸效应,为新标准的实施奠定了应用基础.