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【目的】在木材中原位构建载药半互穿聚合物网络体系,以提高木材耐腐性,改善木材的尺寸稳定性。【方法】以丙烯酸为单体,过硫酸铵为引发剂,N,N’-亚甲基双丙烯酰胺为交联剂,在聚乙二醇存在下原位反应,一步法合成聚丙烯酸/聚乙二醇半互穿聚合物网络(PAA/PEG SIPN)。研究交联剂含量对聚合物性能的影响,并采用傅里叶变换红外光谱(FTIR)、扫描电镜(SEM)、透射电镜(TEM)对其结构和形貌进行表征。采用真空浸渍法将质量百分比为0.5%的丙环唑纳米制剂和反应物注入木材中,使其在木材内部进行原位反应并交联,测试处理后木材的尺寸稳定性和室内耐腐性。【结果】FTIR分析表明,PAA和PEG除形成氢键外,还能通过交联剂形成相对牢固的化学结合。SEM和TEM结果发现,聚乙二醇较均匀地分散在聚丙烯酸中,形成相互贯穿的网络结构。在一定范围内,随着交联剂含量的增加,聚合物的溶胀性能减弱,强度增大。相对于未处理材,处理材的干缩湿胀性得到明显改善。室内耐腐性试验表明,处理材的药剂抗流失性和耐腐性得到明显提高。【结论】本文所及处理方法能够在一定程度上提高木材的尺寸稳定性和防腐性能,虽然对尺寸稳定性的作用尚未达到理想状态,但可为木材的改性处理提供一种新思路。
【Objective】 The drug-loaded semi-interpenetrating polymer network system was constructed in situ in wood to improve the wood corrosion resistance and improve the wood dimensional stability. 【Method】 Acrylic acid as monomer, ammonium persulfate as initiator and N, N’-methylenebisacrylamide as crosslinking agent were reacted in situ in the presence of polyethylene glycol to synthesize polyacrylic acid / poly Ethylene glycol semi-interpenetrating polymer network (PAA / PEG SIPN). The effects of crosslinking agent content on the properties of the polymer were studied. The structure and morphology of the polymer were characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The 0.5% (mass) propiconazole nanocomposite and reactant were impregnated into the wood by vacuum impregnation method, which were reacted in situ and cross-linked in the wood to test the dimensional stability and indoor corrosion resistance of the treated wood. 【Result】 FTIR analysis showed that PAA and PEG could form relatively strong chemical bonds by cross-linking agents besides hydrogen bonding. SEM and TEM results showed that polyethylene glycol was dispersed more evenly in polyacrylic acid to form a network structure penetrating each other. Within a certain range, with the increase of the content of cross-linking agent, the swelling property of polymer decreases and the strength increases. Compared with the untreated material, the dry shrinkage swell of the treated material is significantly improved. Indoor corrosion resistance test showed that the treated material anti-erosion resistance and corrosion resistance has been significantly improved. 【Conclusion】 The treatment methods mentioned in this paper can improve the dimensional stability and corrosion resistance of wood to a certain extent. Although the effect on the dimensional stability has not yet reached the ideal state, it can provide a new idea for wood modification.