桐马酸酐甲酯接枝改性杨木粉的制备及其表征

Preparation and Characterization of Graft-modified Poplar Wood Powder by Methyl Eleostearate Maleic Anhydride Adduct

摘要: 以N,N-二甲基甲酰胺(DMF)为溶剂、吡啶为催化剂,采用桐马酸酐甲酯(MEMA)对杨木粉(PWP)表面接枝化学改性。研究了反应物料配比、反应温度、反应时间及催化剂用量对杨木粉改性反应的影响,并通过接触角测量、元素分析、红外光谱(FT-IR)、 13C固体核磁共振光谱(13C CP-MAS NMR)及扫描电子显微镜(SEM)表征了改性杨木粉的结构与表面性能。实验结果表明:以MEMA与PWP质量比7.5∶1,催化剂吡啶用量为杨木粉质量的 5 %,120 ℃ 反应 6 h,制备的桐马酸酐甲酯改性杨木粉的质量增加率为 20 %~25 %;改性后杨木粉疏水性增强。

Abstract: The graft chemical modification was carried out on the surface of poplar wood powder (PWP) by methyl eleostearate maleic anhydride adduct (MEMA),using pyridine as catalyst in N, N-dimethylformamide (DMF) solution. The effects of material ratio, reaction temperature, reaction time and dosage of catalyst on the reaction were investigated. The chemical structure and surface properties of modified poplar wood power were characterized by contact angle measurement, elemental analysis, FT-IR, 13C CP-MAS NMR and scanning electron microscopy(SEM). The results showed that the weight percent gain of MEMA-modified PWP was from 20 % to 25 % when MEMA reacted with PWP at the mass ratio of 7.5∶1 at 120 ℃ for 6 h with 5 % dosage of pyridine to PWP, and the hydrophobicity of modified PWP was improved.