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中国化学工程学报:英文版 2023年第7期59卷 92-104页

作者： Haixiang Liu Jun Zhang Chunlei Dong Gang Zhu Guanben Du shuduan deng Yunnan Key Laboratory of Wood Adhesives and Glue Products Southwest Forestry UniversityKunming 650224China

In order to reduce the formaldehyde emission of formaldehyde-based wood adhesive from the source,it is aimed to develop a novel co-condensed resin of glyoxal-monomethylolurea-melamine(G-MMU-M).A series of G-MMU-M resins with various formulations of raw materials were successfully prepared.The basic properties and bonding performance of the G-MMU-M resins were determined.Furthermore,the structures of resins were characterized by FTIR,^(13)C NMR,XPS,and ESI-MS.The results show that the prepared G-MMU-M resin remains stable for 30 d,meanwhile,the dry and wet bonding strength of the plywoods bonded with the resins,solid content and viscosity are influenced greatly by the addition amount of melamine and MMU/G molar ratio.The G-MMU-M resins with MMU/G molar ratio of 0.9:1.0 and 8% melamine exhibit the highest dry and bonding strength of 1.98 MPa and 1.27 MPa,increased by 34% and 63%,respectively,in comparison with glyoxal-monomethylolurea(G-MMU)resin.In the G-MMU-M resins,there were four main oligomers including M—CH(—^(+)CH-MMU)-O-MMU,M-CH(—CH_(2)OH)-MMU-O-MMU,M—CH(—OH)—^(+)CH-MMU-O-MMU,and M—CH(—^(+)CH-MMU)-MMU-p-G.

关键词： Wood adhesive Glyoxal-monomethylolurea-melamine Synthesis Chemical reaction Measurement Structure

An efficient corrosion inhibitor of cassava starch graft copolymer for aluminum in phosphoric acid

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Chinese Journal of Chemical Engineering 2021年第9期34卷 222-231页

作者： shuduan deng Xianghong Li Guanben Du Yunnan key laboratory of wood adhesives and glue products Southwest Forestry UniversityKunming 650224China 2 College of Chemical Engineering Southwest Forestry UniversityKunming 650224China

Starch is one of the richest natural polymers with low-cost,non-toxic and biodegradable,but is seldom directly used as corrosion inhibitor due to its poor inhibitive ability and low water solubility.To solve this problem,cassava starch-acryl amide graft copolymer(CS-AAGC)was prepared through grafting acryl amide(AA)with cassava starch(CS),and it was firstly examined as an efficient inhibitor for 1060 aluminum in 1.0 mol·L^(-1)H_(3)PO_(4) media.The adsorption behavior of CS-AAGC and its electrochemical mechanism were investigated by weight loss and electrochemical methods.Additionally,the inhibited aluminum surface was fully characterized by a series of SEM,AFM,contact angle measurements and XPS.Results confirm that CS-AAGC performs better inhibitive ability than CS,AA or CS/AA mixture,and the maximum inhibition efficiency of 1.0 g·L^(-1)CS-AAGC is 90.6%at 20℃.CS-AAGC acts as a mixed-type inhibitor while mainly retards the anodic reaction.EIS has three time constants,and the polarization resistance is significantly increased in the presence of CS-AAGC.The micrograph of inhibited aluminum surface is of hydrophobic nature with low surface roughness and little corrosion degree.

关键词： Rice(Oryza sativa L.) Saline–alkaline stress Abscisic acid(ABA) Os ABA8ox1-kd Endogenous ABA levels

Red tetrazolium as an effective inhibitor for the corrosion of cold rolled steel in 7.0 mol·L^(-1) H_2SO_4 solution

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Chinese Journal of Chemical Engineering 2018年第12期26卷 2641-2653页

作者： Xianghong Li shuduan deng Xiaoguang Xie Faculty of Chemical Engineering Southwest Forestry University Faculty of Materials Science and Engineering Southwest Forestry University School of Chemical Science and Technology Yunnan University

The corrosion inhibition of cold rolled steel(CRS) in 7.0 mol·L^(-1) H_2 SO_4 solution by red tetrazolium(RTZ) was carefully investigated using both experimental procedures and theoretical techniques. The results show that RTZ acts as an effective inhibitor for the corrosion of CRS in 7.0 mol·L^(-1) H_2SO_4, and the maximum inhibition efficiency is higher than 95% with a RTZ concentration of 2.0 mmol·L^(-1). The adsorption of RTZ on CRS surface follows Langmuir isotherm. RTZ effectively retards both cathodic and anodic reactions, and acts as a mixed-type inhibitor. EIS exhibits two capacitive loops, and their resistances increase drastically in the presence of RTZ. SEM and AFM confirm that the addition of RTZ could significantly retard the corrosion of CRS surface. A series of characterizations like FTIR, RS, XRD and XPS reveal that the corrosion CRS surface is composed of the corrosion products of iron sulfates, iron oxides and iron hydroxide, as well as inhibitor. Theoretical results of quantum chemical calculation and molecular dynamics(MD) indicate that the adsorption center of RTZ+(organic cationic part of RTZ) mainly relies on its tetrazole ring,and the adsorption of RTZ+on Fe(001) surface is in a nearly flat orientation mode.

关键词： Steel Sulfuric acid Red tetrazolium Corrosion inhibitor Adsorption

尿素-乙二醛树脂改性大豆蛋白胶黏剂的制备及性能研究

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林产化学与工业 2024年第2期44卷 111-118页

作者：杨舜尧李奇恒张俊夏炎杜官本邓书端西南林业大学云南省木材胶黏剂与胶合板制品重点实验室云南昆明650224

以尿素-乙二醛(UG)树脂和大豆分离蛋白(SPI)为主要原料制备大豆蛋白胶(SUG),并对其固体含量、黏度、表面张力系数、接触角及胶合性能进行测试;利用XPS、FT-IR和^(13)C NMR对合成的SUG的结构进行表征;采用DSC及DMA对SUG的固化性能进行测... 详细信息

以尿素-乙二醛(UG)树脂和大豆分离蛋白(SPI)为主要原料制备大豆蛋白胶(SUG),并对其固体含量、黏度、表面张力系数、接触角及胶合性能进行测试;利用XPS、FT-IR和^(13)C NMR对合成的SUG的结构进行表征;采用DSC及DMA对SUG的固化性能进行测定。研究结果表明:改性后大豆蛋白胶的固体含量、黏度、表面张力系数及接触角随着SPI添加量的增加而增大,其中黏度的变化最显著;合成大豆蛋白胶中主要含有C—C、C—O—C、C=O、C=N、C=O等官能团;结合^(13)C NMR及FT-IR分析结果,可以得出UG树脂与SPI二者之间产生了交联;当SPI用量为30 g,UG树脂用量为50 g时,制备的大豆蛋白基胶黏剂性能较佳且固化后储能模量较大,为4082 MPa,在160和180℃热压温度下制备的胶合板冷水24 h湿强度分别为1.23和1.48 MPa,热水3 h湿强度分别为1.05和1.22 MPa,远大于国家标准GB/T 9846—2015对II类胶合板的要求,且具备一定的耐沸水性能。

关键词：尿素-乙二醛树脂大豆蛋白胶黏剂表征胶合强度

Influence of Annealing Atmosphere on Varistor Property of TiO2-Nb2O5-SrCO3Ceramics

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Materials Sciences and Applications 2021年第11期12卷 461-474页

作者： Kunyong Kang Haodong Zhu Gang Zhu shuduan deng Functional and Wood-Based Ceramics Laboratory Southwest Forestry University Kunming China School of Materials Science and Engineering Southwest Forestry University Kunming China

Varistor ceramics are typical electronic ceramics, which are widely used in circuits of overvoltage protection, high voltage stabilization and high energy surge absorption. TiO2 varistor ceramics has the advantages of low varistor voltage and good dielectric properties, but their low nonlinearity limited the application. The influence of annealing on the varistor properties of TiO2-Nb2O5-SrCO3 ceramics was investigated in this paper. TiO2-Nb2O5-SrCO3 varistor ceramics were prepared by the traditional method of ball grinding-forming-sintering and they were annealed in oxygen and nitrogen, respectively. The nonlinear coefficient α and the breakdown voltage EB of the samples were tested using the varistor dc parameter meter. The microstructure of samples was analyzed by XRD, SEM, STEM-EDAX and SAEDP. The results show that during annealing, Sr2+ ions with a larger radius obtain the kinetic energy and are segregated to grain boundaries, which increases the acceptor density of the grain boundaries and improves α. Annealing in an oxygen atmosphere, the enrichment of oxygen at grain boundaries is also helpful to increase the density of acceptor states and the height of the potential barrier, so as to further increase α. Meanwhile, annealing makes crystalline grains grow properly, which results in even grain size, reduces the porosity and increases the density of grains. So EB tends to reduce. As the doping concentration of Nb2O5 and SrCO3 is 0.15 mol%, respectively, and sintering temperature is 1300°C, TiO2-Nb2O5-SrCO3 varistor ceramics annealed in oxygen for 3 h at 750°C achieved the highest nonlinear coefficient α = 8.9 and the lowest breakdown voltage EB

关键词： TiO2 Nonlinear Coefficient Breakdown Voltage Annealing Atmosphere

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木质素基复合膜材料的制备及应用研究进展

化工新型材料 2024年第4期52卷 1-7页

作者：周逸君贾璐袁豪黎昝红雨邓书端罗蓓 Fan Mizi 夏炎西南林业大学云南省木材胶黏剂及胶合制品重点实验室昆明650224 西南林业大学生命科学学院昆明650224 布鲁内尔大学工程、设计和物理科学学院伦敦UB83PH

木质素作为一种储量丰富、可再生的天然高分子化合物,可与多种聚合物结合,赋予其抗氧化、防紫外、抗菌等性能,但木质素结构的复杂性和异质性限制了其高值化应用。近年来,木质素的改性处理以及木质素衍生的复合薄膜在基础研究和实际应用... 详细信息

木质素作为一种储量丰富、可再生的天然高分子化合物,可与多种聚合物结合,赋予其抗氧化、防紫外、抗菌等性能,但木质素结构的复杂性和异质性限制了其高值化应用。近年来,木质素的改性处理以及木质素衍生的复合薄膜在基础研究和实际应用方面得到了广泛关注。综述了多种具有特定功能(热稳定、抗氧化、紫外屏蔽等)的高附加值木质素基复合膜材料,首先介绍了木质素的结构、特性以及常用的改性方法,其次总结了木质素基复合膜材料的制备及其在食品包装、紫外防护、吸附处理等方面的应用,最后讨论了木质素基复合膜材料面临的主要问题,为环境友好型多功能膜材料的未来发展提供一定的参考。

关键词：木质素改性聚合物复合膜材料多功能

昆明地区室内自然环境对不同类型木质梁蠕变性能的影响

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建筑材料学报 2023年第7期26卷 800-808页

作者：张梓健李统邓书端万辉董春雷西南林业大学云南省木材胶黏剂及胶合制品重点实验室云南昆明650224

采用自研足尺寸木质梁蠕变测试系统,对昆明室内自然环境下2种实木矩形梁和3种木工字梁进行了200 d蠕变测试,并分析其含水率与相对湿度的关系.结果表明:木质梁含水率的变化明显滞后于相对湿度的变化,且其在吸湿段的滞后大于解吸段;2种实... 详细信息

采用自研足尺寸木质梁蠕变测试系统,对昆明室内自然环境下2种实木矩形梁和3种木工字梁进行了200 d蠕变测试,并分析其含水率与相对湿度的关系.结果表明:木质梁含水率的变化明显滞后于相对湿度的变化,且其在吸湿段的滞后大于解吸段;2种实木矩形梁和3种木工字梁在低湿波动、高湿波动、湿度持续波动上升和湿度持续波动下降这4类相对湿度典型变化时段的平均蠕变速率分别为8.839×10^(-2)、1.183×10^(-2)、-1.730×10^(-2)/-3.598×10^(-2)、7.424×10^(-2)/9.007×10^(-2)mm/d,机械吸附蠕变特征明显;7条木质梁的FB90(加载90 d后蠕变挠度与加载1 min后蠕变挠度的比值)小于1.60,满足承重用梁的抗蠕变要求;实木矩形梁的抗蠕变性能优于木工字梁.

关键词：蠕变自然气候实木矩形梁木工字梁定量计算

椰油酸二乙醇酰胺对钢在三氯乙酸溶液中的缓蚀性能

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中国腐蚀与防护学报 2023年第2期43卷 301-311页

作者：仇莉李向红雷然邓书端西南林业大学材料科学与工程学院昆明650224 西南林业大学化学工程学院昆明650224

采用失重实验、电化学实验、表面形貌测试(SEM、AFM)和接触角测试深入研究了0.10 mol/L三氯乙酸(Cl3CCOOH)介质中非离子表面活性剂椰油酸二乙醇酰胺(CDEA)对冷轧钢的缓蚀作用;并探究了缓蚀溶液的表面张力和电导率与缓蚀性能的内在关联... 详细信息

采用失重实验、电化学实验、表面形貌测试(SEM、AFM)和接触角测试深入研究了0.10 mol/L三氯乙酸(Cl3CCOOH)介质中非离子表面活性剂椰油酸二乙醇酰胺(CDEA)对冷轧钢的缓蚀作用;并探究了缓蚀溶液的表面张力和电导率与缓蚀性能的内在关联。结果表明:CDEA对冷轧钢在Cl3CCOOH中有明显的腐蚀抑制作用,20和30℃下,CDEA浓度仅为20 mg/L时,缓蚀率可高达95%以上。缓蚀性能随CDEA浓度增大而增强,但随温度的上升而减弱。CDEA在钢表面的吸附是符合Langmuir吸附的、自发的、放热的过程,20~50℃下标准吸附Gibbs自由能为-33.6~-33.0 kJ/mol。CDEA为既抑制阴极析氢又抑制阳极溶解的混合型缓蚀剂,其缓蚀机理为“几何覆盖效应”。随CDEA的添加,Nyquist图容抗弧增大,且电荷转移电阻增大。SEM和AFM的微观形貌进一步证实了CDEA显著抑制了Cl3CCOOH溶液对冷轧钢表面的腐蚀。缓蚀钢表面呈现较强的疏水性,其接触角为100.66o。溶液表面张力随CDEA的添加而降低,在钢片浸泡后的溶液表面张力较浸泡前有所增加;溶液电导率随CDEA浓度的增加,在50 mg/L附近出现峰值。

关键词：缓蚀椰油酸二乙醇酰胺钢三氯乙酸吸附

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木材拉压一体蠕变自动监测系统的研发

林业工程学报 2022年第2期7卷 151-158页

作者：王杰张梓建万辉邓书端董春雷西南林业大学材料科学与工程学院昆明650224

为解决变温变湿状态下木材拉伸和压缩蠕变试验过程中普遍存在的试验环境难以控制、蠕变变形量难以测量、数据采集烦琐、设备长期运行稳定性较差等问题,依据木材拉伸及压缩力学性能的测试基本原理和相关国内外标准研制了一套木材拉伸及... 详细信息

为解决变温变湿状态下木材拉伸和压缩蠕变试验过程中普遍存在的试验环境难以控制、蠕变变形量难以测量、数据采集烦琐、设备长期运行稳定性较差等问题,依据木材拉伸及压缩力学性能的测试基本原理和相关国内外标准研制了一套木材拉伸及压缩一体化蠕变自动监测系统。系统主要由软件系统和硬件系统两个部分组成,软件系统基于VB语言和查表算法进行开发,硬件系统包括蠕变测试环境系统、框架和受力导向系统、加载系统、拉伸和压缩蠕变测试的转换系统、试件夹装系统及数据采集系统、检测装置与环境系统的连接机架、信号接收和转换系统。该套系统的试验环境参数可调控范围为温度-10~70℃,相对湿度10%~98%,风速为0.3~5.6 m/s,蠕变变形量测试精度为0.001 mm,数据采集间隔1 s~24 h多梯度可调。经过前期14.6 d的木材拉伸蠕变测试和30 d的木材压缩蠕变试验检验,证明该系统可对木材的拉伸或压缩蠕变变形量进行长时间、稳定可靠和高精度的实时动态监测、记录和显示。同时,本次研究的拉压转化装置和加载装置大大降低了同类系统的总质量及试验操作的复杂性,为木材拉伸及压缩蠕变测试和研究提供了一个新的平台。

关键词：蠕变环境拉伸和压缩蠕变转换系统自动监测

新型MOF@木材复合材料的制备及其染料吸附和阻燃性能研究

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功能材料 2023年第1期54卷 1208-1214,1236页

作者：张旭鹏朱刚邓书端李辉张朝岭李凯钱西南林业大学材料科学与工程学院昆明650224 林业生物质资源高效利用技术国家地方联合工程研究中心昆明650224 西南林业大学云南省木材胶黏剂及胶合制品重点实验室昆明650224

金属-有机骨架(MOF)晶体的实际应用通常受其粉末形态的限制。将天然轻木作为基体负载MOF颗粒,采用简便通用的生长策略成功制备了一系列新型MOF@木材(MOF=UiO-66,ZIF-8和ZIF-67)复合材料,并系统研究了其微观结构、阻燃性能及其对亚甲基蓝... 详细信息

金属-有机骨架(MOF)晶体的实际应用通常受其粉末形态的限制。将天然轻木作为基体负载MOF颗粒,采用简便通用的生长策略成功制备了一系列新型MOF@木材(MOF=UiO-66,ZIF-8和ZIF-67)复合材料,并系统研究了其微观结构、阻燃性能及其对亚甲基蓝(MB)染料的吸附行为。研究结果表明,不同晶粒尺寸和形貌的MOF引入木材基体后,大量均匀分布在木材支架内的管腔表面并保持了其结晶度。其中,ZIF-8@木材具有更加优异的MB吸附能力,对MB的去除率为82.5%,最大吸附量可达210.9 mg·g_(-1)。吸附过程符合伪二阶动力学模型,说明MOF@木材对MB的吸附主要为化学吸附。此外,UiO-66的掺入对木材基体早期热稳定性和炭层形成的影响优于ZIFs。相比于天然木材,UiO-66@木材的热释放峰值(PHRR)由94.5 W·g_(-1)急剧降至36.5 W·g_(-1),总热释放量(THR)从7.7 kJ·g_(-1)下降到5.4 kJ·g_(-1)。同时,在800℃的炭化率显著提高了84.8%。本研究为设计和构筑功能化MOF@木材复合材料提供了新的途径,可能促进其在环境和绿色建筑等领域的应用。

关键词：金属-有机骨架木材复合材料吸附阻燃