碱处理对马尼拉麻纤维结构及纸质振膜电声性能的影响  

Effect of alkali treatment on the manila hemp fiber structure and paper diaphragm electro-acoustic performance

作　　者：彭奎 方鹏飞[1] 何春清[1] 肖辉 覃煜焱 胡蓓 PENG Kui;FANG Pengfei;HE Chunqing;XIAO Hui;QIN Yuyan;HU Bei(School of Physics and Technology,Wuhan University,Wuhan 730072,China;Yellow Crane Tower in Wuhan New Material Technology Development Co.Ltd.,Wuhan 430072,China)

机构地区：[1]武汉大学物理科学与技术学院,武汉430072 [2]武汉黄鹤楼新材料科技开发有限公司,武汉430072

出　　处：《功能材料》2018年第8期8068-8074,共7页Journal of Functional Materials

摘　　要：纸质振膜的力学性能会影响扬声器的电声(频率响应)特性,通过对天然纤维改性处理能改善振膜的力学性能。讨论了碱液浓度和处理时间对马尼拉麻纤维结构及纸质振膜力学性能和电声性能的影响。采用SEM、XRD、FT-IR、TGA等表征方法对碱处理前后的马尼拉麻纤维表面形貌、结晶结构、化学组分等进行测试分析。结果表明,随着碱液浓度或处理时间的增加,纤维表面粗糙度增大、纤维的结晶度先增大后减小、纤维表面的木质素及半纤维素减少、纤维素热稳定性提高,木质素的热稳定性降低。碱液浓度过大或处理时间过长,均会导致纤维素的降解,影响振膜力学强度。碱液浓度为5%(质量分数)、室温处理3h时,纤维振膜的力学性能和电声性能达到最佳。The electro-acoustic（frequency response）characteristics of the loudspeaker usually be affected by the mechanical properties of the paper diaphragm.The mechanical properties of the diaphragm were improved by modifying the natural fiber.In this work,the structure of Manila hemp fiber and the mechanical properties,electro-acoustic performance of paper diaphragm were discussed on the effects of alkali concentration and treatment time.The surface morphology,crystal structure and chemical composition of Manila hemp fiber treated before and after were characterized by SEM,XRD,FT-IR,TGA.The results showed that the fiber surface roughness increased,and the crystallinity of the fiber increased and then decreased as the alkali concentration or the treatment time increased.The lignin and hemicellulose on the fiber surface were decreased.The thermo-stability of cellulose improved the same time lignin＇s decreased.When the alkali concentration was too large or the treatment time was too long,the cellulose will be degraded,the mechanical strength of the diaphragm was affected.The fiber diaphragm has the best mechanical properties and electro-acoustic performance with 5 wt% of the alkali concentration,3 hof the treatment time.

关 键 词：碱处理 马尼拉麻纤维结构 纸质振膜 力学性能 电声性能 

分 类 号：TB324[一般工业技术—材料科学与工程] O636.9[理学—高分子化学]