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Enhanced Phase Transition in Poly(ethylene glycol) Grafted Butene-1 Copolymers

Chinese Journal of Polymer Science 2023年第3期41卷 414-421,I0008页

作者： ya-hui lou Wei Li Chun-Jing Qv Zhe Ma Tianjin Key Laboratory of Composite and Functional Materials and School of Materials Science and EngineeringTianjin UniversityTianjin 300072China

In the present work,a series of poly(ethylene glycol) grafted polybutene-1 copolymers(PB-g-PEG) were designed and successfully synthesized with reaction intermediate method,of which the branch densities and length could be tuned *** branch density varied from 0.39 mol% to 1.23 mol% and the branch length was tuned by employing PEG number-averaged molecular weight(Mn) from 350 Da to 750 Da and 1000 *** non-isothermal crystallization and phase transition behaviors of these butene-1 copolymers with varying branches were systematically explored by differential scanning *** results first showed that compared with the linear polybutene-1 homopolymer,presence of steric 4-[4-(trimethylsilylalkynyl)-phenyl]-1-butene(TMS) groups suppressed crystallization and phase transition of ***,the introduction of long poly(ethylene glycol)(PEG) branches with M_(n)=350-1000 Da not only elevated the peak temperature of the non-isothermal crystallization but also enhanced the Ⅱ-Ⅰ phase transition,with respect to copolymers with TMS ***,the quantitative correlations between phase transition kinetics with the branch parameters(density and length) were *** was found that the phase transition presents a non-monotonic trend with increasing branch density and branch *** this case,the optimal branch density and length obtained were 0.77 mol% and 750 Da,*** the small angle X-ray scattering and transmission electron microscopy,a direct correlation between the phase transition kinetics and the long periodicity of separated phase was obtained,which may be due to the increased internal stress and facilitated stress transport.

关键词： Polybutene-1 copolymer Crystallization kinetics Phase transition Phase separation

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Effect of Linear and Ring-like Co-units on the Temperature Dependence of Nucleation and Growth in Ⅱ-Ⅰ Phase Transition of Butene-1 Copolymers

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Chinese Journal of Polymer Science 2018年第11期36卷 1269-1276页

作者： ya-hui lou Yi-Long Liao Li Pan Bin Wang Yue-Sheng Li Zhe Ma Tianjin Key Laboratory of Composite and Functional Materials and School of Materials Science and Engineering Tianjin UniversityTianjin 300072China

The phase transition from tetragonal form II to hexagonal form I was studied for the butene-1/ethylene and butene-1/1,5- hexadiene random copolymers, which have comparable molecular weight but distinct linear ethylene and ringlike methylene-1,3- cyclopentane （MCP） structural co-units, respectively. It is known that this solid phase transition follows the nucleation-growth mechanism, so the stepwise annealing protocol was utilized to investigate the influences of co-units on the optimal nucleation and growth temperatures. Compared with optimal nucleation and growth temperatures of-10 and 3 5 ℃, respectively, in polybutene-1 homopolymer, two butene-1/ethylene copolymers with 1.5 mol% and 4.3 mol% co-units have the slightly lower optimal nucleation temperature of-15 ℃ but much higher optimal growth temperature of 50 ℃. Clearly, the effect of ethylene co-unit is more significant on varying optimal temperature for growth than for nucleation. Furthermore, when the incorporated co-unit is ringlike MCP, the optimal nucleation temperature is -15 ℃ for 2.15 mol% co-units, the same with above BE copolymers, but -13 ℃ for a very low concentration of 0.65 mol%. Interestingly, the optimal growth temperature of butene-1/1,5-hexadiene copolymers with 0.65 mo1%-2.15 mol% MCP co- units increases to 55 ℃, which is also independent on co-unit concentration. These obtained values of optimal temperatures provide crucial parameters for rapid II-I phase transition.

关键词： Butene-1 copolymer Co-unit type Phase transformation Nucleation Crystal growth

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Preparation of silver nanoparticles through the reduction of straw-extracted lignin and its antibacterial hydrogel

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 504-514页

作者： lou Zhang Shuo Li Fu Tang Jingkai Zhang Yuetong Kang Hean Zhang Lidong Li State Key Laboratory for Advanced Metals and Materials School of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing 100083China

Silver nanoparticles(Ag NPs)have attracted attention in the field of biomaterials due to their excellent antibacterial ***,the reducing and stabilizing agents used for the chemical reduction of Ag NPs are usually toxic and may cause water *** this work,Ag NPs(31.2 nm in diameter)were prepared using the extract of straw,an agricultural waste,as the reducing and stabilizing *** analysis revealed that the straw extract contained lignin,the structure of which possesses phenolic hydroxyl and methoxy groups that facilitate the reduction of silver salts into Ag *** surfaces of Ag NPs were negatively charged due to the encapsulation of a thin layer of lignin molecules that prevented their *** the prepared Ag NPs were added to the precursor solution of acrylamide,free radical polymerization was triggered without the need for extra heating or light irradiation,resulting in the rapid formation of an Ag NP-polyacrylamide composite *** inhibition zone test proved that the composite hydrogel possessed excellent antibacterial ability due to the presence of Ag *** prepared hydrogel may have potential applications in the fabrication of biomedical materials,such as antibacterial dressings.

关键词： silver nanoparticles hydrogel straw extraction antibacterial

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Smart Cellulose‑Based Janus Fabrics with Switchable Liquid Transportation for Personal Moisture and Thermal Management

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Nano-Micro Letters 2025年第1期17卷 333-347页

作者： Jianfeng Xi yanling lou Liucheng Meng Chao Deng Youlu Chu Zhaoyang Xu huining Xiao Weibing Wu Jiangsu Co‑Innovation Center of Efficient Processing and Utilization of Forest Resources International Innovation Center for Forest Chemicals and MaterialsJiangsu Provincial Key Lab of Sustainable Pulp and Paper Technology and Biomass MaterialsNanjing Forestry UniversityNanjing 210037People’s Republic of China College of Materials Science and Engineering Nanjing Forestry UniversityNanjing 210037People’s Republic of China Department of Chemical Engineering University of New BrunswickFrederictonNB E3B 5A3Canada Macromolecular Chemistry and Bavarian Polymer Institute University of BayreuthBayreuth 95440Germany

The Janus fabrics designed for personal moisture/thermal regulation have garnered significant attention for their potential to enhance human ***,the development of smart and dynamic fabrics capable of managing personal moisture/thermal comfort in response to changing external environments remains a ***,a smart cellulose-based Janus fabric was designed to dynamically manage personal moisture/*** cotton fabric was grafted with N-isopropylacrylamide to construct a temperature-stimulated transport ***,hydrophobic ethyl cellulose and hydrophilic cellulose nanofiber were sprayed on the bottom and top sides of the fabric to obtain wettability *** fabric exhibits anti-gravity directional liquid transportation from hydrophobic side to hydrophilic side,and can dynamically and continuously control the transportation time in a wide range of 3–66 s as the temperature increases from 10 to 40℃.This smart fabric can quickly dissipate heat at high temperatures,while at low temperatures,it can slow down the heat dissipation rate and prevent the human from becoming too *** addition,the fabric has UV shielding and photodynamic antibacterial properties through depositing graphitic carbon nitride nanosheets on the hydrophilic *** smart fabric offers an innovative approach to maximizing personal comfort in environments with significant temperature variations.

关键词： Directional water transport Cotton fabric Anti-gravity directional liquid transportation Janus wettability

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Anxiolytic Effect of Increased NREM Sleep after Acute Social Defeat Stress in Mice

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Neuroscience Bulletin 2020年第10期36卷 1137-1146页

作者： Xiang Feng hui-Ying Zhao Yu-Jin Shao hui-Fang lou Li-ya Zhu Shumin Duan yan-Qin Yu Department of Neurobiology and Department of Neurology of The Second Affiliated Hospital Zhejiang University School of MedicineHangzhou 310058China

Social defeat stress(SDS)plays a major role in the pathogenesis of psychiatric disorders like anxiety and *** is generally considered to involve recovery of the brain from prior experience during wakefulness and is altered after acute ***,the effect of acute SDS on sleep/wake behavior in mice varies between *** addition,whether sleep changes in response to stress contribute to anxiety is not well ***,we first investigated the effects of acute SDS on sleep/wake states in the active period in *** results showed that total sleep time(time in rapid eyemovement[REM]and non-REM[NREM]sleep)increased in the active period after acute *** sleep increased mainly during the first 3 h after SDS,while REM sleep increased at a later ***,we demonstrated that the increased NREM sleep had an anxiolytic benefit in acute *** deprived of sleep for 1 h or 3 h after acute SDS remained in a highly anxious state,while in mice with ad libitum sleep the anxiety rapidly faded ***,our findings suggest an anxiolytic effect of NREM sleep,and indicate a potential therapeutic strategy for anxiety.

关键词： Social defeat stress Sleep Sleep deprivation Anxiety Anxiolytic effect

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Interactions among Periodic Waves and Solitary Waves of the(2+1)-Dimensional Konopelchenko-Dubrovsky Equation

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Chinese Physics Letters 2013年第6期30卷 5-8页

作者： LEI ya lou Sen-Yue Faculty of Science Ningbo UniversityNingbo 315211 Shanghai Key Laboratory of Trustworthy Computing East China Normal UniversityShanghai 200062

By using the truncated Painlevéanalysis and the generalized tanh function expansion approaches,many interaction solutions among solitons and other types of nonlinear excitations of the Konopelchenko–Dubrovsky(KD)equation can be ***,the soliton-cnoidal wave interaction solutions are studied by means of the Jacobi elliptic functions and the third type of incomplete elliptic integrals.

关键词： elliptic interaction soliton

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Energy-Efficient coaromatization of methane and propane

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Journal of Natural Gas Chemistry 2009年第3期18卷 260-272页

作者： Jianjun Guo hui lou Xiaoming Zheng Institute of Catalysis Zhejiang University Hangzhou 310028 Zhejiang China Division of Functional Materials and Nano Devices Ningbo Institute of Material Technology and Engineering Chinese Academy of Sciences Ningbo 315201 Zhejiang China

Development of highly effective catalysts for one-stage conversion of methane with high selectivity to valuable products and energy efficiency will provide an efficient way to utilize natural gas and oil-associated gases and to protect environment. In recent years, there have been many efforts on direct catalytic transformations of methane into higher hydrocarbons by feeding additives together with methane under non-oxidative conditions. This paper reviewed the advances in recent research on non-oxidative aromatization of methane in the presence of propane over different modified HZSM-5 catalysts. The thermodynamic consideration, the isotope verification and the mechanism of the activation of methane in the presence of propane are discussed in the paper in detail.

关键词： methane propane non-oxidative aromatization

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新课改下化学教育的优化与调整

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湖北科技学院学报 2025年第1期45卷 116-124页

作者：杨小洁王云婷娄佳蕙黄亚琼湖北科技学院核技术与化学生物学院湖北咸宁437100

新课标为化学教学提供了依据,本研究基于化学教学现状分析,以化学新课程标准为调整教学依据。教师通过创设生活和实验情境,设置探究活动提高学生的兴趣。教师除了用教学方法提高学生兴趣外,还需注重知识之间融合,帮助学生形成知识网络... 详细信息

新课标为化学教学提供了依据,本研究基于化学教学现状分析,以化学新课程标准为调整教学依据。教师通过创设生活和实验情境,设置探究活动提高学生的兴趣。教师除了用教学方法提高学生兴趣外,还需注重知识之间融合,帮助学生形成知识网络。教学既包含教师的教也包含学生的学,因此教师应该帮助学生选择合适的学习策略。教师是学生学习的榜样,教师需要提升个人素养以适应教育事业的发展,教师需要提升创新能力、专业能力并与时俱进。

关键词：新课标化学教学学习策略教学策略优化

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Facile Synthesis of 5-Hydroxy-2-(2-phenylethyl)chromone

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Chemical Research in Chinese Universities 2010年第2期26卷 245-248页

作者： ZHANG Lan-ping WANG ya-lou Department of Medicinal Chemistry China Pharmaceutical University Nanjing 210009 P. R. China

5-Hydroxy-2-（2-phenylethyl）chromone（l） was synthesized from 2,6-dihydroxyacetophenone（7） obtained via four-steps resorcinol-reacting with phenylpropionic acid, the procedures involved are Baker-Venkataraman rear... 详细信息

关键词： 5-Hydroxy-2-(2-phenylethyl)chromone Synthesis Baker-Venkataraman rearrangement Imperata cylindrica

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Role of the globus pallidus in motor and non-motor symptoms of Parkinson's disease

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Neural Regeneration Research 2025年第6期20卷 1628-1643页

作者： Yimiao Jiang Zengxin Qi huixian Zhu Kangli Shen Ruiqi Liu Chenxin Fang Weiwei lou Yifan Jiang Wangrui Yuan Xin Cao Liang Chen Qianxing Zhuang Department of Physiology School of MedicineNantong UniversityNantongJiangsu ProvinceChina Department of Neurosurgery Huashan HospitalShanghai Medical CollegeFudan UniversityShanghaiChina National Center for Neurological Disorders ShanghaiChina Shanghai Key Laboratory of Brain Function Restoration and Neural Regeneration ShanghaiChina State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science Institute of Brain ScienceFudan UniversityShanghaiChina

The globus pallidus plays a pivotal role in the basal ganglia circuit. Parkinson's disease is characterized by degeneration of dopamine-producing cells in the substantia nigra, which leads to dopamine deficiency in the brain that subsequently manifests as various motor and non-motor symptoms. This review aims to summarize the involvement of the globus pallidus in both motor and non-motor manifestations of Parkinson's disease. The firing activities of parvalbumin neurons in the medial globus pallidus, including both the firing rate and pattern, exhibit strong correlations with the bradykinesia and rigidity associated with Parkinson's disease. Increased beta oscillations, which are highly correlated with bradykinesia and rigidity, are regulated by the lateral globus pallidus. Furthermore,bradykinesia and rigidity are strongly linked to the loss of dopaminergic projections within the cortical-basal ganglia-thalamocortical loop. Resting tremors are attributed to the transmission of pathological signals from the basal ganglia through the motor cortex to the cerebellum-ventral intermediate nucleus circuit. The cortico–striato–pallidal loop is responsible for mediating pallidi-associated sleep disorders. Medication and deep brain stimulation are the primary therapeutic strategies addressing the globus pallidus in Parkinson's disease. Medication is the primary treatment for motor symptoms in the early stages of Parkinson's disease, while deep brain stimulation has been clinically proven to be effective in alleviating symptoms in patients with advanced Parkinson's disease,particularly for the movement disorders caused by levodopa. Deep brain stimulation targeting the globus pallidus internus can improve motor function in patients with tremordominant and non-tremor-dominant Parkinson's disease, while deep brain stimulation targeting the globus pallidus externus can alter the temporal pattern of neural activity throughout the basal ganglia–thalamus network. Therefore, the comp

关键词： anxiety basal ganglia bradykinesia deep brain stimulation depression globus pallidus externus globus pallidus internus lateral globus pallidus medial globus pallidus neural circuit Parkinson's disease

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