Results 11 to 20 of about 841,203 (143)
, 2019 利用木质素大分子与双酚A相似性,采用木质素替代双酚A制备环氧树脂可减少化石原料双酚A的使用。采用衣康酸助催化高温液态水耦合酶催化水解法提取人工林剩余物―桉木的木质素。电子扫描电镜SEM检测表明:木质素分子量颗粒分布均一,木质素含量97.6%,酚羟基含量1.48 mmol/g。利用木质素与双酚A结构相似,在碱催化下与环氧氯丙烷反应合成木质素基环氧树脂。傅立叶红外光谱检测表明,氢氧化钠催化下发生了化学反应,生成了环氧基,环氧值为0.36 mol/100g。热失重TGA分析显示:双酚A环氧树脂失重发生在314.
苗长林 +4 more
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, 2011 从生物油中分离出热解木质素,对其基本特性进行了研究,同时与一种碱木素进行了对比。两种木质素的主要元素质量分数基本相同,但热解木质素中碳元素质量分数比碱木素稍高,氧元素质量分数稍低;红外光谱试验发现相对于碱木素,热解木质素中含有较少的醇羟基。热重试验结果表明,热解木质素在比较低的温度下表现出较大的质量损失速率,其热稳定性比碱木素差;热解气质联用试验显示出两种木质素的热解产物组成存在较大的差异,在250、550℃两个热解温度条件下热解木质素的热解产物中芳香族化合物含量都明显高于碱木素,而碱木素250 ...
张伟 +4 more
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铁力木种仁营养成分分析Analysis of nutrient components of Mesua ferrea L.seed kernel
Zhongguo youzhi, 2023 为了促进铁力木的开发利用，以铁力木种仁为材料，对其脂肪、水分、蛋白质、可溶性糖、氨基酸、矿物质元素、维生素以及铁力木种仁油的脂肪酸组成及含量进行了分析。结果表明：铁力木种仁中脂肪、水分、蛋白质和可溶性糖的含量分别为58.60、7.90、7.34 g/100 g和4.44 g/100 g；铁力木种仁油中共检出9种脂肪酸，其中饱和脂肪酸5种，含量为32.64%，不饱和脂肪酸4种，含量为66.76%，4种含量最高的脂肪酸分别为油酸（49.10%）、亚油酸（17.30%）、棕榈酸（15.80%）和硬脂酸（15 ...
李洪果1，黎云睦2，田荣雄3，骆相华3，熊俊飞1，黄旭光1，刘世茂4 LI Hongguo1, LI Yunmu2, TIAN Rongxiong3, LUO Xianghua3, XIONG Junfei1, HUANG Xuguang1, LIU Shimao4
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Rare Metals, Volume 45, Issue 9, September 2026.ABSTRACT Lignin hydrogenolysis is a promising route to separable aromatic monomers, yet practical upgrading is still hindered by macromolecular mass‐transfer limitations and the aggregation/deactivation of metal sites. Herein, we propose a “dual‐confinement” strategy to construct ultrafine Ru nanoclusters supported on lignin‐based N‐doped hierarchical ...
Tianjin Li +11 more
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Rare Metals, Volume 45, Issue 8, August 2026.ABSTRACT Infected bone defects represent a dual therapeutic challenge demanding concurrent infection inhibition and osteogenesis promotion. Systemic antibiotic administration is taken as a classical treatment protocol but often yields inadequate local antibiotic concentrations and delayed bone repair.
Xucai Wang +8 more
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Organ‐specific ozone and nitrogen legacies strengthen substrate control over litter decomposition
Functional Ecology, Volume 40, Issue 8, Page 2548-2559, August 2026.Read the free Plain Language Summary for this article on the Journal blog. Abstract Elevated tropospheric ozone (O3) and nitrogen (N) deposition are concurrent atmospheric changes that strongly influence terrestrial carbon cycling, yet their combined effects on below‐ground decomposition remain poorly understood.
Xiaofan Hou +8 more
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Advances in bacterial lignin degradation and transformation mechanisms(细菌降解木质素与转化机制研究进展)
浙江大学学报. 农业与生命科学版Lignin, the second most abundant biomass resource in the plant kingdom after cellulose, is the most plentiful renewable aromatic polymer in nature. However, its complex and recalcitrant structure greatly hinders its efficient utilization.
HE Xiaolong(贺小龙) +5 more
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Functional Ecology, Volume 40, Issue 8, Page 2590-2601, August 2026.Read the free Plain Language Summary for this article on the Journal blog. Abstract Permafrost thaw is reshaping nutrient dynamics in boreal forests, but its impacts on tree nutrient limitation and functional strategies remain poorly understood. Clarifying these responses is crucial for predicting the response of boreal forests to climate change.
Qiyue Fu +9 more
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四川大学学报. 自然科学版, 2007 针对麦草碱木质素水溶性差、分子质量低、难以工业利用的问题,采用Fenton试剂为氧化剂,以亚硫酸钠为磺化剂对麦草浆碱木质素进行氧化再进行磺甲基化反应,得到质量分数为33%(Wt)的氧化磺甲基化碱木质素的溶液.红外光谱(FTIR)测试表明产物中具有磺酸基的特征吸收峰.利用凝胶渗透色谱(GPC)测得其重均分子质量达到6653 g.mol-1.通过紫外吸收光谱(UV)测得其最大吸收波长在276 nm处.通过碱木质素磺化反应前后的核磁共振(13C-NMR)测得磺甲基接入碱木质素中芳环的C-5位 ...
梁文学 +3 more
doaj
Rare Metals, Volume 45, Issue 7, July 2026.ABSTRACT Lignin is a natural non‐toxic polyphenolic macromolecule, which shows inherent antioxidant and broad‐spectrum antibacterial activities. However, due to the low content and the high bond dissociation energy of phenolic hydroxyl groups (Ar‐O·H), its antioxidant and antibacterial activities are relatively weak, which limits its application as a ...
Meiling Han +10 more
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