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首页> 外文期刊>Journal of Biotechnology & Biomaterials >Towards Thermoplastic Lignin Polymers: Progress in the Utilization of Kraft Lignin for the Synthesis of Heat Stable Polymer Melts
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Towards Thermoplastic Lignin Polymers: Progress in the Utilization of Kraft Lignin for the Synthesis of Heat Stable Polymer Melts

机译：热塑性木质素聚合物：利用牛皮纸木质素合成热稳定聚合物熔体的研究进展

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摘要

Most efforts to utilize lignin have been limited by various factors that impart in it characteristics that define it as an unreliable precursor to polymer production. This is because lignin (and more specifically technical lignin) offers relatively unpredictable polymerization characteristics, depending upon its source and the degree of delignification to which the plant materials were subjected. More specifically, the highly functional character of lignin (i.e. rich in phenolic and aliphatic OH groups, as well as reactive benzylic carbons), induces a variety of potential polymerization sites and heat instability in such materials. Both factors promote gelation processes under polymerization conditions or when the temperature increases close to, and/or above the glass transition temperature (Tg). In addition, the relatively low molecular weight (a few thousands) for lignin derived from commercial pulping and biorefinery operations makes lignin unsuitable for higher end applications, such as high performance, heat stable engineering thermoplastic applications.
机译：利用木质素的大多数努力受到各种因素的限制，这些因素赋予了木质素以将其定义为聚合物生产的不可靠前体的特性。这是因为木质素（更具体地说是工业用木质素）提供了相对不可预测的聚合特性，这取决于其来源和植物材料所经受的脱木质素程度。更具体地说，木质素的高功能特性（即富含酚和脂肪族OH基团，以及反应性苄基碳）在这种材料中引起各种潜在的聚合位点和热不稳定性。在聚合条件下或当温度升高至接近和/或高于玻璃化转变温度（Tg）时，这两个因素都会促进胶凝过程。另外，来自商业制浆和生物精炼操作的木质素相对较低的分子量（几千）使木质素不适合高端应用，例如高性能，热稳定的工程热塑性应用。

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