酚醛物质的量比对木质素酚醛树脂物化性质的影响

The Influence of Phenolic Content Ratio on the Physicochemical Properties of Lignin Phenolic Resin

木质素是一种具有苯丙烷特殊结构的生物质,储量丰富。由于其含有类酚羟基团此可以作为酚类化合物替代物质。本研究使用木质素为原料替代苯酚合成热塑性木质素酚醛树脂。为了讨论苯酚甲醛物质的量比对树脂合成的影响,苯酚与甲醛物质的量比分设置为1∶0.8、1∶0.7、1∶0.6进行合成实验,制备了酚醛树脂。采用FTIR、TG、DSC等方法对材料性能进行表征,对不同物质的量比的热塑性酚醛树脂性能进行了研究。酚醛比为1∶0.7时制备的木质素热塑性基酚醛树脂排列有序性较高,热固化温度较高。且热稳定性较优,熔融温度和残炭率均最高。同时通过FTIR数据分析可知其制备的树脂邻位比值相对较高。故选择酚醛物质的量比为1∶0.7的树脂样品作为纺丝前驱体。

Lignin is a biomass with a special structure of phenylpropane and abundant reserves.Due to its phenolic hydroxyl groups,it can be used as a substitute for phenolic compounds.In this study,lignin was used as a raw material to replace phenol in the synthesis of thermoplastic lignin phenol-formaldehyde resin.In order to discuss the effect of the molar ratio of phenol to formaldehyde on resin synthesis,the ratio of phenol to formaldehyde was set at 1∶0.8,1∶0.7,and 1∶0.6 for synthesis experiments,and phenolic resin was prepared.The material properties were characterized using FTIR,TG,DSC and other methods,and the properties of thermoplastic phenolic resins with different molar ratios of substances were studied.The lignin thermoplastic based phenolic resin prepared with a phenol formaldehyde ratio of 1∶0.7 has a higher ordered arrangement and higher thermal curing temperature.And it has excellent thermal stability,with the highest melting temperature and residual carbon rate.Meanwhile,through FTIR dataanalysis,it can be concluded that the prepared resin has a relatively high ortho site ratio.Therefore,a resin sample with a molar ratio of 1∶0.7 of phenolic substances was selected as the spinning precursor.