摘要:
为探讨发泡剂偶氮二甲酰胺(AC)添加量对麦秸秆/聚丙烯(PP)发泡复合材料的热稳定性、微观结构以及化学结构的影响,采用TG-DSC、FTIR和体视显微镜分析了麦秸秆/PP发泡复合材料的热稳定性、化学结构和微观结构,并测定了复合材料的线性膨胀系数、导热系数、表观密度和力学性能。结果表明:AC添加量及其热分解程度均对麦秸秆/PP发泡复合材料的热稳定性、泡孔结构和热膨胀性能影响显著;当AC添加量为1.0wt%时,其热分解程度最高,复合材料具有较好的热稳定性,泡孔结构均匀,麦秸秆与基体界面稳定,线性膨胀系数最小。所得结论表明,当AC添加量为1.0wt%时,麦秸秆/PP发泡复合材料具有较好的综合性能。
Abstract:
In order to investigate the influences of foaming agent azodicarbonamide (AC) additive amount on the thermo-stability, microstructure and chemical structure of wheat straw/polypropylene (PP) foamed composites, TG-DSC, FTIR and stereomicroscope were used to analyze the thermo-stability, chemical structure and microstructure of wheat straw/PP foamed composites, and linear expansion coefficient, thermal conductivity, apparent density and mechanical properties of composites were also measured. The results show that AC additive amount and its thermal decomposition degree both have great influences on the thermo-stability, pore structure and thermal expansion properties of wheat straw/PP foamed composites. When AC additive amount is 1.0wt%, the thermal decomposition degree is the highest, and the composites have relatively preferable thermo-stability, the pore structure is homogeneous, interface between wheat straw and matrix is stable, and the linear expansion coefficient is the lowest. The conclusions obtained indicate that when AC additive amount is 1.0wt%, the wheat straw/PP foamed composites have relatively preferable comprehensive performance.
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