摘要
连续跟踪不同处理麦秆表面接触角随时间的变化值,确定用于计算表面自由能的接触角数据,依据Young方程及Owens-Wendt-Kaelble法,求解不同处理麦秆表面自由能及其极性和非极性分量(色散力分量)。结果表明,未经处理麦秆外表面自由能为37.20 mJ/m2,其非极性分量占84.11%,内表面自由能高达51.54 mJ/m2,其非极性分量占50.50%。经1%的NaOH溶液95℃和85℃热处理,麦秆外表面自由能由37.20 mJ/m2增至51.72 mJ/m2和44.21 mJ/m2,其极性分量增加了377.58%和229.13%。经180℃和160℃热处理,麦秆外表面自由能变化不显著,但其极性分量显著增加,非极性分量显著降低。
The contact angles for calculating free energy of wheat straw surface pretreated with different methods were chosen by continuous monitoring the response of contact angles to time. The surface free energies and its polar and non polar part were studied, based on Young equation and methods suggested by Owens-Wendt-Kaelble. The results reveal that both free energy of out and inner surfaces untreated are 37.20 mJ/m^2and 51.54 mJ/m^2, wherein the non polar part of out and inner surfaces accounts for 84.11% and 50.50%, respectively. After pretreated with 1% NaOH solution at 95℃ and 85℃, 51.72 mJ/m^2and 44.21 mJ/m^2out surface free energy are achieved,wherein the polar part increases 377. 58% and 229.13%, respectively. Pretreated at 180℃ and 160℃, the out surface free energy changes a little, but its polar part elevats significantly, its non polar Dart decreases sienificantlv.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2007年第3期207-210,共4页
Polymer Materials Science & Engineering
基金
山东省资源节约基金资助(2006JY27)
济南大学博士基金资助(B0521)
关键词
动态接触角
表面自由能
麦秆
生物质
dynamic contact angles
surface free energy
wheat straw
biomass