木质素磺酸铵对聚乳酸/木纤维可生物降解复合材料力学与热性能的影响  

Influence of ammonium lignosulphonate on mechanical and thermal properties of polylactic acid/wood fiber biodegradable composites

作　　者：胡建鹏[1] 郭明辉[1] 

机构地区：[1]东北林业大学生物质材料科学与技术教育部重点实验室,哈尔滨150040

出　　处：《复合材料学报》2015年第3期657-664,共8页Acta Materiae Compositae Sinica

基　　金："十二五"国家科技支撑计划(2011BAD08B03)

摘　　要：为探讨生物质资源改善复合材料的界面及综合性能的可行性,以木纤维(WF)为基体,聚乳酸(PLA)为增强体,添加氧化改性木质素磺酸铵(OMAL),采用高速混合-平板热压工艺制备环境友好型OMAL-PLA/WF复合材料。研究了OMAL对OMAL-PLA/WF复合材料力学和热性能的影响。结果表明:在WF与PLA质量比为7∶3的复合体系中,OMAL对提高OMAL-PLA/WF复合材料的静曲强度、弹性模量以及内结合强度具有促进作用。OMAL添加量为15wt%~20wt%时,OMAL-PLA/WF复合材料的力学性能最好;当OMAL添加量为20wt%时,与PLA/WF对照样相比,OMAL-PLA/WF复合材料的热分解起始温度降低45℃,热分解速率特征峰温度提前107℃,残渣量增加5.3%,玻璃化转变温度、冷结晶温度和熔融温度均向低温方向移动,储能模量和损耗角正切值增大,玻璃态阶段的热稳定温度范围提高约20℃。In order to investigate the feasibility of biomass resources improving the interface and comprehensive properties of bio-composites,the oxidation modification ammonium lignosulphonate(OMAL)was used to produce the environment friendly OMAL-polylactic acid(PLA)/wood fiber(WF)composites by the high speed mix-flat hot pressing process with WF as matrix and PLA as reinforcement.The influence of OMAL on mechanical and thermal properties of OMAL-PLA/WF composites was investigated.The results show that OMAL can improve the modulus of rupture,elastic modulus and internal bond strength of OMAL-PLA/WF composites with mass ratio 7∶3of WF to PLA,and the optimized mechanical properties are achieved with OMAL dosage of 15wt%-20wt%.When the OMAL dosage is 20wt%,the thermal decomposition initial temperature decreases 45 ℃,the characteristic peak of thermal decomposition rate arises 107 ℃in advance,the residue quantity increases by 5.3%,the glass transition temperature,cold crystallization temperature and melting temperature shift to low temperature,the storage modulus and loss tangent increase with the temperature range of the platform stage increases about 20℃compared to that of PLA/WF composites.

关 键 词：木质素磺酸铵 木纤维 聚乳酸 复合材料 力学性能 热性能 

分 类 号：TB332[一般工业技术—材料科学与工程]