检索结果-内蒙古大学图书馆

Synergistic plasticizing effect of bio-based isosorbide di-epoxidized oleate on poly(vinyl chloride) resins

POLYMER BULLETIN 2024年第13期81卷 11671-11691页

作者： Huang, Wenyan Nan, Hui Ma, Jianzhe Dong, Kuiyun Zhong, Heyan Zhang, Jingjing Wu, Jian Xue, Caihong Xu, Shiai Liu, Guangxi Qinghai Univ Qinghai High Performance Light Met Alloy & Deep Pr Key Lab Qinghai Prov Light Alloy Xining 810016 Peoples R China Qinghai Yihua Chem Co Datong 810100 Peoples R China Qinghai Univ Sch Chem Engn Xining 810016 Peoples R China East China Univ Sci & Technol Sch Mat Sci & Engn Shanghai Key Lab Adv Polymer Mat Shanghai 200237 Peoples R China

The strategic importance of developing environmentally friendly PVC biomass plasticizers with excellent anti-migration and plasticizing effects cannot be overstated. This paper delves into the synthesis and application of bio-based isosorbide di-epoxidized oleate (IDEO) as a secondary biomass plasticizer in polyvinyl chloride (PVC) films. Explored were the synergistic effects between IDEO and dioctyl phthalate (DOP), alongside an assessment of the influence of the compound plasticizer on the properties of PVC products. The partial substitution of DOP resulted in PVC films with improved thermal stability, flexibility, and migration resistance. IDEO-10/PVC, in particular, exhibited a 64% increase in tensile strength compared to DOP/PVC and maintained thermal stabilization for over 280 min at 180 degrees C. With a glass transition temperature (Tg) of 33 degrees C, a plasticizing efficiency of 148%, and excellent cold resistance properties, IDEO-10/PVC outperformed DOP/PVC. IDEO-10/PVC migration resistance was significantly lower than in the original PVC resin with only DOP plasticizers under three different polar conditions. Transmittance remained above 87% after 10 days of UV irradiation. Molecular dynamics simulation further confirmed the synergistic plasticizing effect between IDEO and DOP at an IDEO addition of 10 phr. The environmentally friendly approach holds significant promise for the scaled-up application of PVC.

关键词： Poly(vinyl chloride) Bio-based plasticizer Synergistic plasticity Migration resistance

来源：评论

学校读者我要写书评

暂无评论

Hollow Bimetallic Cobalt-Based Selenide Polyhedrons for Efficient Hydrogen Production in Practical PEM Electrolysis

引用

ACS SUSTAINABLE CHEMISTRY & ENGINEERING 2024年第26期12卷 10020-10032页

作者： Li, Jinpeng Wang, Zhi Chen, Xiangrui Wang, Zhaokun Wang, Jiashuai Shi, Haofeng Wang, Chengdeng Bai, Zhiming Gao, Yan Zhu, Chuang Yan, Xiaoqin Univ Sci & Technol Beijing Sch Mat Sci & Engn State Key Lab Adv Met & Mat Beijing 100083 Peoples R China Natl Ctr Nanosci & Technol Lab Nanosyst & Hierarchy Fabricat Beijing 100190 Peoples R China Univ Sci & Technol Beijing Sch Civil & Resource Engn Beijing 10083 Peoples R China Henan Polytech Univ State Key Lab Cultivat Base Gas Geol & Gas Control Jiaozuo 454003 Peoples R China Qinghai Univ New Energy Photovolta Ind Res Ctr Xining 810016 Peoples R China

The development of efficient, stable, and cost-effective electrocatalysts for hydrogen evolution reactions is of utmost importance in order to replace expensive Pt-based catalysts in proton exchange membranes (PEMs) and advance the storage and conversion of hydrogen energy. Herein, a novel electrocatalyst, NixCo1-xSe2 N-doped carbon hollow polyhedrons (NCHP), was prepared by employing a ZIF-8@67 core-shell composite precursor and implementing a pyrolysis-selenylation process. In particular, Ni0.1Co0.9Se2/NCHP demonstrated a remarkable performance for the HER in a wide pH range. It exhibited a low overpotential of 89.8 mV and a small Tafel slope of only 48.3 mV dec(-1) at a current density of 10 mA cm(-2) in 0.5 M H2SO4. It could also exhibit exceptional properties in 0.1 M PBS and 1.0 M KOH conditions simultaneously. The PEM electrolyzer, incorporating Ni0.1Co0.9Se2/NCHP as the cathode, exhibited remarkably high critical current density (1.83 V@500 mA cm(-2)) and outstanding stability (500 mA cm(-2)@100 h). The microscopic characterization and theoretical calculation revealed that the evaporation of inner zinc effectively mitigated element agglomeration, while the incorporation of an appropriate amount of nickel atoms into CoSe2 induced favorable adsorption-desorption behavior. This modification accelerated the kinetics of the HER, thereby enhancing the electrocatalyst's intrinsic catalytic activity and stability.

关键词： metal-organic frameworks MOF on MOF transition metal selenides hydrogen evolution reaction PEM

来源：评论

学校读者我要写书评

暂无评论

Synthesis and properties of bio-based environmental plasticizer derived from oleic acid for poly (vinyl chloride)

引用

JOURNAL OF APPLIED POLYMER science 2024年第26期141卷 e55572-e55572页

作者： Huang, Wenyan Nan, Hui Ma, Jianzhe Dong, Kuiyun Zhang, Jingjing Liu, Guangxi Wu, Jian Xue, Caihong Xu, Shiai Zhong, Heyan Qinghai Univ Qinghai High Performance Light Met Alloy & Deep Pr Key Lab Qinghai Prov Light Alloy Xining 810016 Peoples R China Qinghai Yihua Chem Co Hubei Yihua Grp Co Ltd Qinghai Branch Datong 810100 Peoples R China Qinghai Univ Sch Chem Engn Xining 810016 Peoples R China East China Univ Sci & Technol Sch Mat Sci & Engn Shanghai Key Lab Adv Polymer Mat Shanghai Peoples R China

Using the abundant and cost-effective oleic acid and isosorbide with excellent properties as raw materials, the plasticizers of isosorbide di-oleate (IDO) and isosorbide di-epoxidized oleate (IDEO) with good plasticizing effect, low cost and green safety were synthesized by esterification and epoxidation reaction. The molecular structure of the synthesized plasticizers was characterized by FT-IR and 1H NMR. The PVC shows better flexibility when IDEO or IDO plasticizer is used than commercial DOP. In particular, IDEO-40 has 34% higher tensile strength and 17% higher elongation at break than DOP-40. The introduction of epoxy groups on the carbon-carbon double bond of fatty acids meets the high thermal stability of plasticized film. The residual amount of IDEO-40 is 7.01%, and at a high temperature of 180 degrees C, it can maintain high heat resistance for more than 220 min and transmittance of over 86%. Moreover, IDEO demonstrates excellent resistance to migration and volatilization. However, PVC films plasticized with IDO display reduced mechanical properties, cold resistance, and resistance to volatilization and migration due to the presence of non-rotating carbon-carbon double bonds. The results indicate that these bio-based plasticizers hold promise for practical applications in PVC products, offering improved environmental sustainability and performance characteristics. Biomass Plasticizers for PVC: Synthesis & Performance. image

关键词： isosorbide oleic acid plasticizer poly (vinyl chloride)

来源：评论

学校读者我要写书评

暂无评论

Phase Interface Engineering Using Defective 1T/2H-MoSe2 for Electromagnetic Wave Absorption

引用

ACS APPLIED NANO MATERIALS 2025年第16期8卷 8376-8384页

作者： Wang, Tengfei Pang, Qing Liu, Boyu Wang, Hongyu Qinghai Univ Qinghai Prov Engn Res Ctr High Performance Light M Qinghai Prov Key Lab New Light Alloys Xining 810016 Peoples R China

In recent years, molybdenum diselenide (MoSe2) nanomaterials have been proven to be promising electromagnetic wave (EMW) absorbers, attributed to the formation of a heterogeneous interface between the 2H semiconductor phase and the 1T metal phase during its preparation. However, the difficulty in precisely controlling the two-phase ratio and the complexity of the process hinder its further development. In this work, we constructed a simple phase engineering strategy based on the regulation of reducing agent concentration, achieving a regulation of the 1T phase proportion in defective 1T/2H-MoSe2 nanomaterials (ranging from 67.91 to 41.45%) by accurately adjusting the amount of NaBH4 added. The findings indicate that the material exhibits excellent microwave absorption performance when the 1T phase proportion reaches 53.55% (1T/2H-MoSe2-2), demonstrating a minimum reflection loss (RLmin) of -40.0 dB, and the effective absorption bandwidth (EAB) covers 6.08 GHz (11.92-18.0 GHz) when the thickness is 2.6 mm. The enhancement in performance results from a synergistic balance mechanism established by the abundant 1T-2H heterogeneous interface, which induces interfacial polarization loss, along with a moderately enhanced conductive loss in the 1T/2H-MoSe2-2 nanomaterial. Furthermore, radar cross-section (RCS) simulation results confirm the dramatic dissipation ability of absorbers for EMW in practical applications. This strategy paves the way for designs of interfaces and the control of the performance of absorbing nanomaterials based on transition-metal dichalcogenides (TMDs).

关键词： phase interface engineering defect 1T/2H-MoSe2 dielectric loss microwave absorption RCS simulation

来源：评论

学校读者我要写书评

暂无评论

Oxyphosphorodithiolation of Vinyl Azides with P4S10 and Alcohols Leading to β-Keto Phosphorodithioates

引用

JOURNAL OF ORGANIC CHEMISTRY 2024年第24期89卷 18384-18392页

作者： Huang, Jian Ma, Chao Sun, Jian Gao, Wenhui Lv, Yufen Yue, Huilan Yi, Dong Wei, Wei Qufu Normal Univ Sch Chem & Chem Engn Qufu 273165 Shandong Peoples R China Northwest Inst Plateau Biol Qinghai Prov Key Lab Tibetan Med Res Xining 810008 Peoples R China CAS Key Lab Tibetan Med Res Northwest Inst Plateau Biol Qinghai 810008 Peoples R China Southwest Med Univ Sch Pharm Green Pharmaceut Technol Key Lab Luzhou City Luzhou 646000 Sichuan Peoples R China

A simple strategy for the synthesis of beta-keto phosphorodithioates has been developed through the direct oxyphosphorodithiolation of vinyl azides with P4S10 and alcohols in the presence of water. The reaction is conducted at room temperature to provide a number of beta-keto phosphorodithioates in moderate to good yields. This methodology has the advantages of simple operation, mild condition, broad substrate scope, and favorable group compatibility.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Synthesized the cold-resistant plasticizer epoxidized 1,6-hexanediol oleate and effects on the properties of polyvinyl chloride

引用

POLYMER BULLETIN 2024年第16期81卷 15043-15064页

作者： Dong, Kuiyun Xue, Caihong Nan, Hui Huang, Wenyan Zhong, Heyan Liu, Guangxi Yang, Guijun Xu, Shiai Zhang, Jingjing Qinghai Univ Xining 810016 Peoples R China Qinghai Yihua Chem Co Datong 810100 Peoples R China East China Univ Sci & Technol Sch Mat Sci & Engn Shanghai Key Lab Adv Polymer Mat Shanghai 200237 Peoples R China

In order to solve the problem of plasticizers limited in alpine regions, in this paper, 1,6-hexanediol oleate (HD) was synthesized by a simple synthetic method using oleic acid and 1.6-hexanediol, and its epoxidation reaction was utilized to prepare a cold-resistant plasticizer (epoxidized 1,6-hexanediol oleate (EHD)) with excellent performances, which was structurally characterized by using Fourier transform infrared spectroscopy and 1HNMR. The properties of HD and EHD plasticized polyvinyl chloride (PVC) were tested and compared with dioctyl adipate (DOA). The results showed that the elongation at break, migration resistance and UV resistance of HD plasticized PVC films were slightly lower than those of DOA plasticized PVC films, but the temperature was 24.4 degrees C higher than that of DOA at 25% loss of mass, and the thermal stability was better;the epoxidized EHD plasticized PVC films showed 48.78% higher mechanical properties, 11.4 degrees C higher thermal stability at 25% loss of mass, higher migration resistance, compared with the DOA plasticized PVC films. The mechanical properties were 48.78% higher than those of DOA plasticized PVC films, the migration resistance was more stable in petroleum ether and anhydrous ethanol, and the UV resistance was better than that of DOA plasticized PVC films. Molecular dynamics simulations further verified the migration resistance of EHD/PVC in different solvents. In conclusion, EHD is suitable for low-temperature environments with excellent cold resistance, migration resistance and good stability.

关键词： Cold resistance Migration resistance Polyvinyl chloride Plasticizer

来源：评论

学校读者我要写书评

暂无评论

Construction of three-dimensional holey/magnetic Co graphene aerogel for lightweight and broadband microwave absorption

引用

DIAMOND AND RELATED MATERIALS 2025年 153卷

作者： Wang, Tengfei Liu, Boyu Pang, Qing Wang, Hongyu Qinghai Univ Qinghai Prov Engn Res Ctr High Performance Light M Qinghai Prov Key Lab New Light Alloys Xining 810016 Peoples R China

Three-dimensional graphene aerogels are emerging as promising materials for microwave absorption, due to their unique characteristics of low density and high porosity. Although lightweight electromagnetic wave (EMW) graphene-based aerogel absorbers have been developed, synergistically optimizing the EMW performance of these absorbers through structural design and simultaneously introducing multiple loss mechanisms remains challenging. This paper presents an innovative design strategy that modifies the hole structure of aerogel by controlling the content of Co ions while simultaneously introducing magnetic loss, thereby achieving ultra-light broadband absorption performance. Notably, when the added amount of Co ions is 0.3 mmol, the aerogel exhibits a minimum reflection loss (RLmin) of -44.9 dB, and an effective absorption bandwidth (EAB) of 5.68 GHz. The remarkable EMW absorption performance can be attributed to the enhancements of polarization loss and magnetic loss. Furthermore, the RCS simulation results indicate that the aerogel effectively reduces EMW scattering in practical applications. Thus, this research offers a highly effective strategy for the development of EMW absorption materials that are thin, lightweight, broadband, and high-performance.

关键词： Holey graphene aerogel Magnetic loss Microwave absorption RCS simulation

来源：评论

学校读者我要写书评

暂无评论

Nanoporous 3D Polyurethane for Toosendanin Adsorption, Encapsulation, and High-Efficient Utilization

引用

JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2025年第8期73卷 4574-4584页

作者： Li, Wen-kui Wang, Song Wang, Yong-hong Wu, Yu-zhen Li, Jia Chai, Tian-hua Wang, Kang Chen, Guangyou Ma, Zhiqing Northwest A&F Univ Coll Plant Protect Yangling 712100 Peoples R China Engn & Res Ctr Biol Pesticides Shaanxi Prov Yangling 712100 Peoples R China

Nanoporous 3D-polyurethane (3D-PU) was prepared based on nano-CaCO3 templated controllably confined polymerization assembly and weak acid etching strategies. Nanopores with diameters ranging from 48 to 72 nm were distributed on 3D-PU, facilitating its high BET surface area of 468.0 m2/g. The 3D-PU exhibited enhanced adsorption selectivity to multi-H-bond donors and acceptors, multirings contained compounds based on pore filling, hydrogen-bonding, and pi-pi interactions;therefore, the novel 3D-PU had promising adsorption ability to toosendanin (TSN) with a maximum theoretical adsorption capacity of 361.6 mg/g. Adsorption isotherm, kinetic, and thermodynamic investigations revealed that the adsorption was heterogeneous and was supported by multiple adsorption sites, controlled by a chemical adsorption mechanism, endothermic, spontaneous, and with increased entropy. Based on the optimized adsorption, the loading capacity (LC) of 3D-PU toward TSN attained 23.4%. After encapsulation, the effective period of TSN was extended to 11 days, the photolysis half-life of TSN was increased 3.2 times, and the LC50 for Aphis citricola was reduced approximately 6.0 times, indicating that 3D-PU effectively improved the performance of TSN. The porous 3D-PU can serve as a promising carrier for more pesticide adsorption, encapsulation, safe, highly efficient, and environmentally friendly utilization.

关键词： porous materials polyurethane adsorption encapsulation pesticide utilization

来源：评论

学校读者我要写书评

暂无评论

High-concentration electrolytes for lithium-metal batteries operating at high temperatures

引用

IONICS 2025年第5期31卷 4227-4237页

作者： Luo, Lufang He, Jinzuo Yan, Xiao Qiu, Haodong Zhang, Lijuan Qinghai Minzu Univ Sch Chem & Mat Sci Xining 810007 Peoples R China

Commercialized electrolytes for lithium-metal batteries have a maximum temperature restriction of 60 degrees C, which significantly restricts the use of these batteries in situations with greater temperatures. In this paper, we study the construction of a high-temperature electrolyte system for lithium-metal batteries, using 0.5 M LiODFB-EC/EMC (3:7) as the basic electrolyte system, and 1, 2, and 3 M LiTFSI were added to form electrolytes with different concentrations, to investigate the effect of LiTFSI concentration on lithium-metal batteries. The mixed lithium salts used in this system are lithium bis(trifluorosulfonyl) imide (LiTFSI) and lithium difluoro-oxalate-borate (LiODFB), with ethylene carbonate (EC) and ethyl methyl carbonate (EMC) as the mixed solvent systems. Additionally, we study the electrochemical performance at 45 degrees C and 70 degrees C. The best battery performance was achieved with batteries built with the 3.0 M LiTFSI/0.5 M LiODFB electrolyte. In the LiCoO2/Li discharge performance after 500 cycles, the battery's discharge-specific capacity was 117.8 mAh/g, and its capacity retention rate was 82.8%. Better than previous concentration electrolyte systems, the battery constructed with this electrolyte has a greater discharge-specific capacity and cycle stability at 70 degrees C.

关键词： High-temperature lithium-metal batteries Lithium bis(trifluorosulfonyl)imide (LiTFSI) Lithium difluorooxalate borate (LiODFB) Highly concentrated electrolyte Solid-state electrolyte film

来源：评论

学校读者我要写书评

暂无评论

Introducing defects and crystalline/amorphous heterostructures on mesoporous TiO2 to realize broadband microwave absorption

引用

CERAMICS INTERNATIONAL 2025年第2期51卷 1643-1653页

作者： Wang, Tengfei Pang, Qing Liu, Boyu Wang, Hongyu Qinghai Univ Qinghai Prov Engn Res Ctr High Performance Light M Qinghai Prov Key Lab New Light Alloys Xining 810016 Peoples R China

Titanium dioxide (TiO2), once considered a promising material for microwave absorption, still faces significant challenges in achieving broadband absorption performance. To address this issue, herein, a simple approach is reported for successfully introducing defects and crystalline/amorphous heterostructures onto mesoporous TiO2 (Meso-am-TiO2-x). This study demonstrates the superior microwave absorbing properties of Meso-am-TiO2-x, particularly in the low-frequency range. A reflection loss of up to-25.7 dB is achieved with a thickness of 4.6 mm, and the effective absorption bandwidth (EAB) value extends to 4.32 GHz. The experimental results indicate that the synergistic effects of the high specific surface area of mesoporous TiO2, defects-induced conduction loss, defect-induced dipole polarization loss, and interfacial polarization loss between the crystalline and amorphous heterostructures enhance the microwave absorption properties of Meso-am-TiO2-x. This study provides insights toward developing innovative low-frequency broadband TiO2 absorbers.

关键词： Defects Crystalline/amorphous heterostructures Mesoporous TiO 2 Microwave absorption

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：