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首页> 外文期刊>Journal of Polymers and the Environment >Lignin Functionalized by Thermally Curable Propargyl Groups as Heat-Resistant Polymeric Material
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Lignin Functionalized by Thermally Curable Propargyl Groups as Heat-Resistant Polymeric Material

机译：木质素被可热固化的丙炔基官能化为耐热聚合物材料

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摘要

Lignin was chemically functionalized via Williamson etherification reaction with propargyl bromide to prepare a thermosetting bio-resin, propargyllignin. The optimum reaction conditions were found at 70 ℃ for 4 h under the catalysis of sodium hydroxide in the ethanol solution. The propargllignin resin had highly improved processing capability, evidenced by good solubility, low melting point (< 100 ℃) and thermal curability. Upon heating, propargyllignin resin solidified with an exotherm around 180-280 ℃ peaking at 240 ℃, implying its thermal cure reaction via ethynyl polymerization. Compared with lignin feedstock, the propargyllignin resin showed much higher thermal properties: an onset decomposition temperature of 410 ℃ and a residue yield of 58 % at 800 ℃ (for lignin, onset decomposition temperature of 250 ℃ and residue yield of 34 %). Different from the lignin feedstock, propargyllignin was readily applied as curable thermosetting resin for composite matrix, and exhibited high mechanical and thermal properties.
机译：通过威廉姆森与炔丙基溴的醚化反应对木质素进行化学官能化，以制备热固性生物树脂炔丙基木质素。在乙醇溶液中氢氧化钠的催化下，在70℃下反应4h，最佳反应条件得以确定。丙炔木质素树脂具有良好的加工性能，其良好的溶解性，低熔点（<100℃）和热固化性得到了证明。加热后，炔丙基木质素树脂在180-280℃附近放热固化，在240℃达到峰值，这意味着它通过乙炔基聚合反应发生热固化反应。与木质素原料相比，炔丙基木质素树脂具有更高的热性能：起始分解温度为410℃，在800℃时的残渣产率为58％（木质素的起始分解温度为250℃，残渣产率为34％）。与木质素原料不同，炔丙基木质素易于用作复合基质的可固化热固性树脂，并具有较高的机械和热性能。

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