Nowadays, most researchers at home and abroad are studying the planting of seashore mallow and the efficient extraction of mallow seed oil, while the remaining mallow stems are generally incinerated or discarded. In fact, there are a lot of bundle fibers in mallow stem bark(MSB), and their physical properties such as strength and modulus are close to those of jute and flax. So developing the fiber-reinforced composites of mallow stem bark fiber(MSBF) has high potential application value. Using mallow stem bark as raw material, MSBF was extracted by alkali degumming process, and MSBF reinforced polypropylene(PP) composites with fiber mass fraction of 40%, 30%, 20%, 10% and 0% were prepared by using alkali-treated MSBF as reinforcement and PP fiber as matrix. The effects of fiber mass fraction on tensile, bending and sound insulation properties of MSBF reinforced PP composites were discussed. The results show that when the fiber mass fraction was 30%, the tensile breaking strength, tensile modulus and bending modulus of the composite were the highest, and the bending strength gradually enchanes with the increase of the fiber mass fraction of MSBF. When the fiber mass fraction exceeds 10%, the voltage peak attenuation rate of MSBF reinforced PP composites increases first and then decreases with the increase of sounding frequency. When the sound frequency is the same, the lower the fiber mass fraction, the worse the sound insulation performance of the composite. When the fiber mass fraction exceeds 30%, the voltage peak attenuation rate decreases.

目前，国内外大多数研究人员都在研究海滨锦葵的种植和锦葵籽油的高效提取，而剩余的锦葵茎通常被焚烧或丢弃。事实上，锦葵茎皮（MSB）中含有大量束纤维，其强度和模量等物理性质接近黄麻和亚麻。因此开发锦葵茎皮纤维(MSBF)纤维增强复合材料具有很高的潜在应用价值。以锦葵茎皮为原料，通过碱脱胶工艺提取MSBF，经碱处理制备纤维质量分数为40%、30%、20%、10%和0%的MSBF增强聚丙烯（PP）复合材料。 MSBF 为增强体，PP 纤维为基体。纤维质量分数对拉伸的影响，讨论了MSBF增强PP复合材料的弯曲和隔音性能。结果表明，当纤维质量分数为30%时，复合材料的拉伸断裂强度、拉伸模量和弯曲模量最高，并且随着MSBF纤维质量分数的增加，弯曲强度逐渐增大。当纤维质量分数超过10%时，MSBF增强PP复合材料的电压峰值衰减率随发声频率的增加先增大后减小。当声频相同时，纤维质量分数越低，复合材料的隔声性能越差。当纤维质量分数超过30%时，电压峰值衰减率降低。复合材料的拉伸断裂强度、拉伸模量和弯曲模量均最高，并且随着MSBF纤维质量分数的增加，弯曲强度逐渐增大。当纤维质量分数超过10%时，MSBF增强PP复合材料的电压峰值衰减率随发声频率的增加先增大后减小。当声频相同时，纤维质量分数越低，复合材料的隔声性能越差。当纤维质量分数超过30%时，电压峰值衰减率降低。复合材料的拉伸断裂强度、拉伸模量和弯曲模量均最高，并且随着MSBF纤维质量分数的增加，弯曲强度逐渐增大。当纤维质量分数超过10%时，MSBF增强PP复合材料的电压峰值衰减率随发声频率的增加先增大后减小。当声频相同时，纤维质量分数越低，复合材料的隔声性能越差。当纤维质量分数超过30%时，电压峰值衰减率降低。MSBF增强PP复合材料的电压峰值衰减率随着探测频率的增加先增大后减小。当声频相同时，纤维质量分数越低，复合材料的隔声性能越差。当纤维质量分数超过30%时，电压峰值衰减率降低。MSBF增强PP复合材料的电压峰值衰减率随着探测频率的增加先增大后减小。当声频相同时，纤维质量分数越低，复合材料的隔声性能越差。当纤维质量分数超过30%时，电压峰值衰减率降低。