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合成了氯代1-(2-羟乙基)-3-甲基咪唑离子液体[He MIM]Cl、溴代1-乙胺基-3-甲基咪唑离子液体[Ae MIM]Br和氯代1-羧乙基-3-甲基咪唑离子液体[Ce MIM]Cl 3种功能化咪唑离子液体,并分别进行了红外与氢核磁结构表征.然后用3种离子液体液化木粉,液化3 h后向体系直接加入苯酚、甲醛和氢氧化钠,制备酚醛复合材料,并采用FTIR、XRD、DSC和SEM对酚醛复合材料进行结构、性能与形貌测试,研究离子液体种类对木粉液化率及酚醛树脂性能的影响.结果表明,离子液体及其液化木粉产物制备的酚醛复合材料性能得到明显改善.[Ce MIM]Cl液化效果最好,90℃液化率高达24.6%,当[Ce MIM]Cl与木粉质量比为10∶1时,制备的酚醛复合材料的游离醛释放量由原来的3.64%降低到0.92%.离子液体[Ae MIM]Br能将酚醛复合材料的冲击强度由原来的0.93 k J/m2提高到6.96 k J/m2,而[Ae MIM]Br及其液化的木粉产物制备的酚醛复合材料拉伸强度从原来的3.28 MPa提高到9.70 MPa.
The synthesis of 1- (2-hydroxyethyl) -3-methylimidazolium ionic liquid [He MIM] Cl, bromo-1-ethylamino-3-methylimidazolium ionic liquid [ 1-carboxyethyl-3-methylimidazolium ionic liquid [Ce MIM] Cl 3 functionalized imidazolium ionic liquids were synthesized and characterized by IR and 1H NMR, respectively, and then liquefied with 3 kinds of ionic liquids for 3 h Phenolic composites were prepared by direct addition of phenol, formaldehyde and sodium hydroxide to the system. The structure, properties and morphology of phenolic composites were tested by FTIR, XRD, DSC and SEM. The effects of ionic liquids on the liquefaction and Phenolic resin.The results showed that the properties of the phenolic composites prepared by the ionic liquid and the liquefied wood flour product were significantly improved.The best liquefaction effect was [Ce MIM] Cl, the liquefaction rate was as high as 24.6% at 90 ℃, Cl and wood flour mass ratio of 10: 1, the free formaldehyde release of the prepared phenolic composite material from the original 3.64% to 0.92% ionic liquid [Ae MIM] Br phenolic composite can be the impact strength from the original 0.93 kJ / m2 to 6.96 kJ / m2, while the [Ae MIM] Br and its liquefied wood flour product prepared phenolic compounds Tensile strength of the material from the original 3.28 MPa to 9.70 MPa.