乙酰化木粉基复合材料的疏水与流变性能研究  

Hydrophobic and Rheological Properties of Acetylated Wood Flour Based Composites

作　　者：谢振华[1,2,3,4] 张明明[1,2,3,4] 金立维[1,2,3,4,5] 

机构地区：[1]中国林业科学研究院 林产化学工业研究所 [2]生物质化学利用国家工程实验室 [3]国家林业局林产化学工程重点开放性实验室 [4]江苏省生物质能源与材料重点实验室,江苏南京210042 [5]中国林业科学研究院林业新技术研究所,北京100091

出　　处：《林产化学与工业》2015年第1期39-44,共6页Chemistry and Industry of Forest Products

基　　金：林业公益性行业科研重大专项(201104004)

摘　　要：通过双螺杆挤出、注塑方法制备了木粉(WF)、乙酰化木粉(AWF)与低密度聚乙烯(LDPE)、聚乳酸(PLA)的共混材料。采用吸水率测定、接触角测量、旋转流变仪、拉伸测试和扫描电镜(SEM)分别表征了共混材料的疏水、流变性能、力学性能和微观形貌结构。结果表明:由AWF制备的共混材料相比同质量比例的由WF制备的共混材料具有更好的疏水性能,吸水率发生了大幅度降低。随着材料中AWF含量的减少,共混材料的吸水率逐渐降低,接触角逐渐增大。流变测试表明AWF/LDPE共混材料在黏度和储能模量方面都低于WF/LDPE共混材料,AWF/LDPE共混材料的黏度和储能模量也随着AWF含量的减小而减小。力学性能测试显示由AWF制备得到的复合材料相比于由WF制备的复合材料的拉伸强度有所下降,断裂伸长率却有较大幅度的提升。SEM分析表明AWF与塑料基体的相容性得到了改善,两相之间共混分散结合更加紧密。Blends of wood fluor（ WF）,acetylation wood flour（ AWF） with low density polyethylene（ LDPE） and polylactic acid（ PLA） were produced by twin-screw extruding and injection molding,respectively. Hydrophobicity,rheology,mechanical properties,and morphology of the composites were measured by moisture absorption,contact angle measurement,rotational rheometer,tensile tests and scanning electrical microscope（ SEM）,respectively. The results showed blending composites of AWF had better hydrophobic performance,and its moisture absorption reduced significantly compared with blending composites of WF. The moisture absorption decreased with the decrease of AWF content in composites,and the contact angle increased.Compared with WF / LDPE composites,AWF / LDPE composites had less viscosity and storage modulus. The viscosity and storage modulus of AWF / LDPE composites decreased with the decrease of AWF. The tensile strength of AWF blend composites was lower than that of WF blend composites,but the elongation at break showed a substantial increase. The results of SEM showed that the compatibility between AWF and plastic matrix was improved,and they adhered and blended more closely.

关 键 词：乙酰化木粉 复合材料 疏水性能 流变性能 力学性能 

分 类 号：TQ35[化学工程] TB332[一般工业技术—材料科学与工程]