蔗渣全组分紫外光屏蔽膜的制备及性能研究

doi:10.3969/j.issn.0253-2417.2023.03.001

摘要/Abstract

摘要：

为构建生物质全组分新型复合膜材料，利用氯化胆碱-草酸二水合物-甘油(ChCl-OAd-Gly)三元低共熔溶剂预处理蔗渣原料，并将处理后残渣与溶出组分再复合，经纳米均质化处理成功制备含木质素的纳米纤维素(LNC)，再经真空抽滤和热压制备了含木质素的纳米纤维素复合膜(LNCF)功能材料，并利用元素分析、原子力显微镜(AFM)、扫描电子显微镜(SEM)、材料万用试验仪、热重分析仪和分光光度计，研究了木质素添加量对LNCF的紫外光屏蔽性能、机械性能、抗水性、热稳定性和形貌等的影响规律。研究结果表明：随着木质素添加量以体积分数20%的比例增加，LNC中木质素质量分数以2~3个百分点递增，LNC的直径略有减小；制备的LNCF均具有良好的紫外光屏蔽效果，其中木质素添加100%的LNCF(LNCF-100%)在200~400 nm下的紫外光屏蔽率达到99.68%，且其390~780 nm可见光透过率达到65.46%。此外，木质素的添加增强了LNCF的机械性能，其拉伸强度由未添加木质素(LNCF-0%)的76.61 MPa提升至LNCF-100%的144.73 MPa；LNCF的抗水性能得到了显著改善，LNCF-100%表面的水接触角达到90.47°(LNCF-0%为52.15°)，吸水率由LNCF-0%的21.52%降低至7.14%，使其湿态机械性能得到了保持，湿强度达到77.3 MPa；6种LNCF的最大热失重温度均高于337 ℃，具有良好的热稳定性。

关键词: 低共熔溶剂, 蔗渣, 纳米纤维素膜, 木质素

Abstract:

In order to construct a new composite film material with all-component from biomass, ternary deep eutectic solvent consisting of choline chloride-oxalic acid dihydrate-glycerol(ChCl-OAd-Gly) was used to pretreat bagasse raw materials, and the treated residue was recombined with the dissolved components to obtain lignin-containing nanocellulose(LNC) by homogeniza-tion. The lignin-containing nanocellulose film(LNCF) functional materials was then prepared via vacuum-assisted and hot press methods. The influence of the lignin content on UV shielding properties, mechanical properties, water resistance, thermal stability and morphology of LNCF were studied using elemental analysis, atomic force microscopy(AFM), scanning electron microscopy(SEM), material universal tester, thermogravimetric analyzer and spectrophotometer. The results showed that with the lignin addition increase at 20% by volume, the lignin mass fraction in LNC increase 2-3 percentage point the diameter of LNC decrease slightly. The prepared LNCF exhibited good UV shielding effect, and the UV shielding rate in 200-400 nm and the visible light transmittance in 390-780 nm for LNCF-100% reached 99.68% and 65.46%, respectively. The addition of lignin enhanced the mechanical properties of LNCF, and its tensile strength increased from 76.61 MPa of LNCF-0% to 144.73 MPa of LNCF-100%. The hydrophobicity of LNCF was significantly improved. The water contact angle of LNCF-100% surface was 90.47°, and the water absorption rate of LNCF-0% without lignin reduced from 21.52% to 7.14%. Accordingly, the wet mechanical properties were maintained with the wet strength up to 77.3 MPa. Moreover, all six LNCF displayed good thermal stability, and the temperature of maximum pyrolytic weight loss was higher than 337 ℃。

Key words: deep eutectic solvent, bagasse, nanocellulose film, lignin

中图分类号:

TQ35
TB383.2

柯珣, 杨塬兴, 赵丽红. 蔗渣全组分紫外光屏蔽膜的制备及性能研究[J]. 林产化学与工业, 2023, 43(3): 1-8.

Xun KE, Yuanxing YANG, Lihong ZHAO. Preparation and Properties of UV-shielded Film Derived from Full Components of Bagasse[J]. Chemistry and Industry of Forest Products, 2023, 43(3): 1-8.

图/表 7

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样品¹⁾sample	密度/(g·cm^-3)density	厚度/μmthickness	吸水率/%water absorption	不同波长下的紫外光屏蔽率/%UV shielding efficiency at different wavelengths
样品¹⁾sample	密度/(g·cm^-3)density	厚度/μmthickness	吸水率/%water absorption	200~280 nm	>280~320 nm	>320~400 nm	200~400 nm
LNCF-0%	0.94±0.08	59.55±2.79	21.52±2.33	89.25	83.30	77.81	83.48
LNCF-20%	0.93±0.11	60.18±2.81	15.23±1.25	93.74	91.29	90.23	91.85
LNCF-40%	0.95±0.09	62.23±2.72	13.81±1.59	97.31	94.57	94.12	95.49
LNCF-60%	0.94±0.17	65.24±2.17	11.35±1.88	98.14	98.08	97.87	98.02
LNCF-80%	1.02±0.13	67.02±1.95	10.22±1.61	99.13	99.05	98.45	98.84
LNCF-100%	1.10±0.14	77.50±2.33	7.14±0.98	99.64	99.69	99.71	99.68

样品sample	接触角contact angle/°	韧性toughness/(MJ·m^-3)
LNCF-0%	52.15	2.16
LNCF-20%	50.05	1.99
LNCF-40%	64.20	2.28
LNCF-60%	69.90	3.79
LNCF-80%	79.18	4.21
LNCF-100%	90.47	5.37

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