日前，国家香蕉产业技术体系土壤肥料与水分管理岗位的论文“Preparation of a novel lignin-based film with high solid content and its physicochemical characteristics”被国际农林领域顶级学术期刊《Industrial Crops & Products》（中科院一区，IF=4.244）录用发表。岗位专家樊小林教授和岗位成员孙少龙教授为通讯作者。该项工作得到了国家香蕉产业技术体系专项资金（CARS-31）的支持。

作者：陈小娟，李中华，张立丹，王浩然，邱聪智，樊小林*，孙少龙*

题目：一种高固含量可降解的木质素基包膜肥膜材制备及其理化性能评估

摘要：在二氧化硅作为流平剂和分散剂的条件下，将碱木质素（AL）和聚乙二醇（PEG）与六亚甲基二异氰酸酯（HDI）聚合，以形成具有高固含量的新型木质素基聚氨酯膜材（LPF）。本文系统地评估了最佳木质素固含量（60%）条件下， -CNO/-OH摩尔比（1.00、1.05、1.10、1.15、1.20）对膜材热稳定性、机械性能、玻璃化转变温度（T_g）、水接触角（WCA）、铅笔硬度、粘附性和降解性能的影响。红外光谱证实了AL和PEG成功与HDI反应。随着-CNO/-OH摩尔比的增加，LPF的弹性模量（121.62–157.20 MPa）、拉伸强度（13.31–17.07 MPa）、WCA（63.6–71.3°）和铅笔硬度（2B–2H）同时呈现增加的趋势，而LPF的断裂伸长率（465.53–326.74％）则呈现逐渐降低的趋势。以上变化趋势与HDI和多元醇（AL和PEG）之间提高的交联程度有关。在高的-CNO/-OH摩尔比条件下，由于多余的-CNO存在，导致LPF的最高裂解温度（T_max）、T_g和热容量变化（Δ_Cp）显示出先升高后降低的变化趋势。此外，所有LPF呈现出高的粘附性（5B）和良好的生物降解性能（60天降解率为13.6%–16.6%）。上述良好的膜材理化性能，将有助于促进工业用木质素的增值应用，尤其包膜肥料的膜层构建。

全文链接： https://doi.org/10.1016/j.indcrop.2021.113396。

Chen, X.J., Li, Z.H., Zhang, L.D., Wang, H.R., Qiu, C.Z., Fan, X.L.,* Sun, S.L.,* 2021. Preparation of a novel lignin-based film with high solid content and its physicochemical characteristics. Ind. Crops Prod. 164, 113396.

Abstract

Alkali lignin (AL) and polyethylene glycol (PEG) were polymerized with hexamethylene diisocyanate (HDI) to form a novel lignin-based polyurethane film (LPF) with high solid content under the condition of silica as leveling and dispersing agent. The -CNO/-OH molar ratio under the optimum lignin content condition on the effects of thermal stability, mechanical property, glass transition temperature (T_g), water contact angle (WCA), pencil hardness, and crosshatch adhesion of LPFs were systematically evaluated. Fourier transform infrared spectra confirmed that AL and PEG successfully reacted with HDI. The elasticity modulus (121.62–157.20 MPa), tensile strength (13.31–17.07 MPa), WCA (63.6–71.3°), and pencil hardness (2B–2H) of LPFs increased simultaneously as the -CNO/-OH molar ratio increased. The elongation at break (465.53–326.74%) of the LPFs gradually decreased. The change trends were probably related to the enhanced crosslinking density between HDI and polyols (AL and PEG). The maximum decomposition temperature (T_max), T_g and heat capacity change (ΔC_p) of the LPFs showed a trend of first increasing and then decreasing as result of the superfluous -CNO. Interestingly, all the LPFs appeared strong crosshatch adhesion (5B) and excellent biodegradability. The approach with short processing time and simple operation was a potential method for preparing LPFs with high solid content. The experiment will help to promote the value-added application of technical lignin, such as layer construction of coated fertilizer.

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