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The Crystallization and Melting Behaviors of PDLA-b-PBS-b-PDLA Tri-block Copolymers

Chinese Journal of Polymer Science 2020年第3期38卷 298-310,I0008页

作者： Cong-Shu Feng Yun Chen Jun Shao Gao Li hao-qing hou College of chemistry and chemical engineering Jiangxi Normal UniversityNanchang 330022China Jiangxi Key Laboratory of Organic Chemistry Jiangxi Science and Technology Normal UniversityNanchang 330013China Key Laboratory of Polymer Ecomaterials Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China

In this study,the poly(D-lactide)-block-poly(butylene succinate)-block-poly(D-lactide)(PDLA-b-PBS-b-PDLA)triblock copolymers with a fixed length of PBS and various lengths of PDLA are synthesized,and the crystallization behaviors of the PDLA and PBS blocks are *** both the crystallization behaviors of PBS and PDLA blocks depend on composition,they exhibit different *** the PDLA block,its crystallization behaviors are mainly influenced by temperature and block *** crystallization signals of PDLA block appear in the B-D 2-2 specimen,and these signals get enhanced with PDLA block *** crystallization rates tend to decrease with increasing PDLA block lendth during crystallizing at 90 and 100°*** at higher temperature,the crystallization rates increase at first and then decrease with block *** crystallization rates decrease as elevating the crystallization *** melting temperatures of PDLA blocks increase with block lengths and crystallization *** the PBS block,its crystallization behaviors are mainly controlled by the nucleation and confinement from PDLA *** crystallization and melting enthalpies as well as the crystallization and melting temperatures of PBS block reduce as a longer PDLA block has been copolymerized,while the crystallization rates of the PBS block exhibit unique component dependence,and the highest rate is observed in the B-D 2-2 *** Avrami exponent of PBS crystallites is reduced as a longer PDLA block is incorporated or the sample is crystallized at higher *** investigation provides a convenient route to tune the crystallization behavior of PBS and PLA.

关键词： Poly(butylenes succinate)(PBS) Poly(D-lactide)(PDLA) Poly(D-lactide)-block-PBS-block-poly(D-lactide)(PDLA-b-PBS-b-PDLA) Crystallization behavior

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High Strength Electrospun Single Copolyacrylonitrile(coPAN)Nanofibers with Improved Molecular Orientation by Drawing

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Chinese Journal of Polymer Science 2021年第2期39卷 174-180,I0006页

作者： Tang-Cheng Xu Dong-Hua Han Yong-Mei Zhu Gai-Gai Duan Kun-Ming Liu hao-qing hou Department of Chemistry and Chemical Engineering Jiangxi Normal UniversityNanchang 330022China Co-Innovation Center of Efficient Processing and Utilization of Forest Resources College of Materials Science and EngineeringNanjing Forestry UniversityNanjing 210037China School of Metallurgical and Chemical Engineering Jiangxi University of Science and TechnologyGanzhou 341000China

High-performance carbon nanofibers are highly dependent on the performance of their precursors,especially polyacrylonitrile(PAN).In this work,the copolymer of PAN(coPAN)was synthesized for electrospinning.A self-assembling set-up was used for the stretching of single coPAN *** and Raman spectroscopies were used to characterize the chemical structure of coPAN *** electron microscopy(SEM)and atomic force microscopy(AFM)were used to monitor the morphology of single coPAN nanofibers under different drawing ***-tensile test was used to determine the mechanical properties of single coPAN *** results indicated that the drawing led to an increase in degree of molecular orientation along the fiber axis from 0.656 to 0.808,tensile strength from 304 MPa to 595 MPa,and modulus from 3.1 GPa to 12.4 *** research would provide fundamental information of high-performance electrospun coPAN nanofibers and offer opportunities for the preparation of high-performance carbon nanofibers.

关键词： Single nanofiber Electrospinning Polyacrylonitrile Molecular orientation Mechanical property

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The Crystallization Behavior of L-Poly(lactic acid)/Polypropylene Blends:The Acceleration for Both L-Poly(lactic acid)and Polypropylene

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Chinese Journal of Polymer Science 2024年第6期42卷 775-786页

作者： Shuang-Cheng Li Wei-Jia Zhou Wen-Jie Wu Jun Shao Shui-Liang Chen hao-qing hou Sheng Xiang College of Chemistry&Chemical Engineering and Nanofiber Engineering Center of Jiangxi Province Jiangxi Normal UniversityNanchang330022China National Engineering Research Center for Carbohydrate Synthesis/Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education Jiangxi Normal UniversityNanchang330022China Wenzhou Institute University of Chinese Academy of SciencesWenzhou325001China

For a polymer/polymer dismissible blend with two crystallizable components,the crystallization behavior of different components and the reciprocal influences between different crystals are interesting and important,but did not investigate in *** this study,the L-poly(lactic acid)/polypropylene(PLLA/PP)blends with different weight ratios were prepared by melt mixing and the crystallization behavior of the blends were *** showed that the crystalline structures of PLLA and PP were not altered by the *** the crystallization of PLLA,both the diffusion of chain segments and crystallization rate were enhanced under the existence of PP *** the crystallization of PP,its crystallization rate was depressed under the existence of amorphous PLLA molecular *** the PP crystallized from the existence of PLLA crystals,although the diffusion rate of PP was reduced by PLLA crystals,the nucleation positions were obviously enhanced,which accelerated the formation of PP *** investigation would supply more basic data for the application of PLLA/PP blend.

关键词： L-poly(lactic acid) Polypropylene Blends Crystalization behavior Crystallization acceleration

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A Facile Strategy to Enhance the Formation of Stereocomplex Crystallites in Poly(L-lactic acid)/Poly(D-lactic acid) Blend with High Molecular Weights

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Chinese Journal of Polymer Science 2023年第7期41卷 1115-1122页

作者： Chan-Na Zhong Ya-Dong Liu Juan Tang Wei-Shuo Chen Shuang-Cheng Li Jun Shao hao-qing hou College of Chemistry&Chemical Engineering and Nanofiber Engineering Center of Jiangxi Province Jiangxi Normal UniversityNanchang330022China Key Laboratory of Polymer Ecomaterials Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun130022China National Engineering Research Center for Carbohydrate Synthesis/Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education Jiangxi Normal UniversityNanchang330022China

Blending of poly(levorotatory-lactic acid) (PLLA) and poly(dextrorotatory-lactic acid) (PDLA) produces the stereocomplex crystallites (PLA SC), which present higher melting temperature and mechanical properties than that of neat PLLA or PDLA. However, in the PLLA/PDLA blends with higher molecular weights, the phase separation occurs and the SC exhibits weak memory after melting, which lead to a small amount of SC together with a large amount of homochiral crystallites (HC) develop during crystallization from the melt. In this study, a small content of graphite oxide was blended with PLLA and PDLA to form ternary blends, and it was exciting to find that the formation of SC was enhanced gradually with the content of graphite oxide. The SC exclusively developed when 2 wt% graphite oxide was incorporated into the PLLA/PDLA, and the crystallinity with ∼50% was received even during fast cooling from the melt (−50 ℃/min). The acceleration formation of SC was speculated due to the interaction between PLA molecular chains and the hydroxyl groups on the surface of graphite oxide and the obstruction of proliferation of graphite oxide.

关键词： Poly(lactic acid)stereocomplex Graphite oxide Crystallization behavior Melt memory

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High Strength and Stable Proton Exchange Membrane Based on Perfluorosulfonic Acid/Polybenzimidazole

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Chinese Journal of Polymer Science 2022年第7期40卷 764-771页

作者： Tang-Cheng Xu Chang-Shui Wang Zhao-Yu Hu Jiao-Jiao Zheng Shao-Hua Jiang Shui-Jian He hao-qing hou College of Chemistry and Chemical Engineering Jiangxi Normal UniversityNanchang330022China Co-Innovation Center of Efficient Processing and Utilization of Forest Resources College of Materials Science and EngineeringNanjing Forestry UniversityNanjing210037China

In this work,a series of high strength,thermal stable and antioxidant proton exchange membranes were designed with solution processible polybenzimidazole(PBI)as the matrix and perfluorosulfonic acid(PFSA)as the fortifier for proton *** processible PBI was successfully synthesized by introducing 4,4’-dicarboxydiphenyl ether into the molecular chains of ***/PBI composite membranes were obtained by solution blending and film *** and PFSA/PBI composite membranes exhibited greatly enhanced tensile strength and Young’s modulus compared to ***/PBI composite membranes are stable below 300℃ which are suitable for practical application in proton exchange membrane fuel *** PFSA/PBI composite membranes show good dimensional stability with low water uptake and swelling *** PFSA/PBI composite membranes also exhibit excellent antioxidation stability with less than 5%initial mass loss over 120 h in Fenton *** proton conductivity of PBI is greatly enhanced by blending with PFSA and the proton conductivities of the composite membranes are increased with the raise of PFSA content and *** work offers valuable insights into the exploration of PBI based high-performance proton exchange membranes.

关键词： Solution processible polybenzimidazole Perfluorosulfonic acid Proton exchange membrane Film casting High strength

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The Stereocomplex Formation and Phase Separation of PLLA/PDLA Blends with Different Optical Purities and Molecular Weights

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Chinese Journal of Polymer Science 2015年第12期33卷 1713-1720页

作者： Jun Shao Yan-long Liu Sheng Xiang Xin-chao Bian Jing-ru Sun 李杲陈学思 hao-qing hou College of Chemistry and Chemical Engineering Jiangxi Normal University Key Laboratory of Polymer Ecomaterials Changchun Institute of Applied Chemistry Chinese Academy of Sciences

In this study, the poly（L-lactide）/poly（D-lactide）（PLLA/PDLA） blends with different optical purities of PLLA and various molecular weights of PDLA are prepared by solution mixing, and the stereocomplex formation and phase separation behaviors of these blends are investigated. Results reveal that optical purity and molecular weight do not vary the crystal structure of PLA stereocomplex （sc） and homochiral crystallites （hc）. As the optical purity increasing in the blends, the melting temperature of sc （Tsc） and the content of sc （AHsc） increased, while the melting temperature of hc （Thin） hardly changes, although the content ofhc （AHhm） decreased gradually. The Tsc and AHsc are also enhanced as the molecular weight of PDLA reduces, and the AHhm reduces rapidly even though the Thin does not vary apparently. With lower optical purities of PLLA and higher molecular weights of PDLA, three types of crystals form in the blends, i.e., PLA sc, PLLA hc and PDLA hc. As molecular weight decreases and optical purity enhances, the crystal phase decreases to two （sc and PDLA hc）, and one （sc） finally. This investigation indicates that the phase separation behavior between PLLA and PDLA in the PLLA/PDLA blends not only depends on molecular weights, but also relies on the optical purities of polymers.

关键词： Poly(L-lactide) Poly(D-lactide) Poly(lactide) stereocomplex Homocrystallites Phase separation.

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High Performance Electrospun Polynaphthalimide Nanofibrous Membranes with Excellent Resistance to Chemically Harsh Conditions

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Chinese Journal of Polymer Science 2021年第12期39卷 1634-1644页

作者： Meng-Jie Yuan Zhao-Yu Hu Hong Fang Shu-Jing Li Hong-Tao Guo Ru-Bei Hu Shao-Hua Jiang Kun-Ming Liu hao-qing hou Department of Chemistry and Chemical Engineering Jiangxi Normal UniversityNanchang 330022China Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources International Innovation Center for Forest Chemicals and MaterialsCollege of Materials Science and EngineeringNanjing Forestry UniversityNanjing 210037China Shandong Key Laboratory of Biochemical Analysis College of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042China Faculty of Materials Metallurgy and Chemistry Jiangxi University of Science and TechnologyGanzhou 341000China

Polynaphthalimide(PNI)with six-membered imide ring(_(6-)PI)has better chemical resistance than five-membered imide ring(_(5-)PI),but is difficult to be processed into nano fibers due to the poor *** this work,we proposed a template strategy to fabricate nanofiber _(6-)PI membranes and their composite *** _(6-)PI and _(6-)PI composite fibrous membranes were prepared using high-molecular-weight polymers _(5-)PAA and PVP as templates by ***,DMA,TGA and tensile tests were used to characterize their chemical structures,thermal stability and mechanical *** eye-observation,micro-morphology investigation and tensile tests were applied to evaluate the chemical resistance of nanofibrous membranes in strong acid,strong alkaline,and concentrated *** results demonstrated that 6-PI nano fibrous membra nes possessed the best thermal stability,best acid,alkaline,and salt resista nee with the highest mecha nical rete *** study will provide basic information for high-performance electrospun 6-PI nanofiber membranes and provide opportunities for applications of Pls in different chemically harsh environments.

关键词： Polynaphthalimide Nanofibrous membrane Strong acid Strong base Salt

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Advances in Graphene‑Based Electrode for Triboelectric Nanogenerator

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Nano-Micro Letters 2025年第1期17卷 378-403页

作者： Bin Xie Yuanhui Guo Yun Chen hao Zhang Jiawei Xiao Maoxiang hou Huilong Liu Li Ma Xin Chen Chingping Wong State Key Laboratory of Precision Electronic Manufacturing Technology and Equipment Guangdong University of TechnologyGuangzhou 510006People’s Republic of China School of Electromechanical Engineering Guangdong University of TechnologyGuangzhou 510006People’s Republic of China School of Materials Science and Engineering Georgia Institute of TechnologyAtlantaGA 30332USA

With the continuous development of wearable electronics,wireless sensor networks and other micro-electronic devices,there is an increasingly urgent need for miniature,flexible and efficient nanopower generation *** nanogenerator(TENG)technology can convert small mechanical energy into electricity,which is expected to address this *** the core component of TENG,the choice of electrode materials significantly affects its *** metal electrode materials often suffer from problems such as durability,which limits the further application of ***,as a novel electrode material,shows excellent prospects for application in TENG owing to its unique structure and excellent electrical *** review systematically summarizes the recent research progress and application prospects of TENGs based on graphene *** precision processing methods of graphene electrodes are introduced,and the applications of graphene electrode-based TENGs in various scenarios as well as the enhancement of graphene electrodes for TENG performance are *** addition,the future development of graphene electrode-based TENGs is also prospectively discussed,aiming to promote the continuous advancement of graphene electrode-based TENGs.

关键词： Triboelectric nanogenerator Precision processing Graphene electrode Self-powered sensor

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Plasmonic tandem heterojunctions enable high-efficiency charge transfer for broad spectrum photocatalytic hydrogen production

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Journal of Energy Chemistry 2025年第1期100卷 710-720页

作者： Wenxuan Chen Xiu-qing Qiao Guo Hui Bojing Sun Dongfang hou Meidi Wang Xueqian Wu Tao Wu Dong-Sheng Li College of Materials and Chemical Engineering Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials China Three Gorges University Hubei Three Gorges Laboratory College of Chemistry and Materials Science and Guangdong Provincial Key Laboratory of Supramolecular Coordination Chemistry Jinan University

Rational engineering of semiconductor photocatalysts for efficient hydrogen production is of great significance but still challenging,primarily due to the limitations in charge transfer ***,a fascinating plasmonic tandem heterojunction with the hc-CdS/Mo2C@C heterostructure is aimfully prepared for effectively promoting the charge separation kinetics of the CdS photocatalyst via the synergistic strategy of phase junction,Schottky junction,and photothermal *** difference in atomic configuration between cubic-CdS （c-CdS） and hexagonal-CdS （h-CdS） leads to effective charge separation through a typical Ⅱ charge transfer mechanism,and plasmonic Schottky junction further extracts the electrons in the hc-CdS phase junction to realize gradient charge ***,the photothermal effect of Mo2C@C helps to expand the light absorption,accelerate charge transfer kinetics,and reduce the hydrogen evolution energy *** carbon layer provides a fast channel for charge transfer and protects the photocatalyst from *** a result,the optimized hc-CMC photocatalyst exhibits a significantly high photocatalytic H2production activity of 28.63 mmol/g/h and apparent quantum efficiency of 61.8%,surpassing most of the reported *** study provides a feasible strategy to enhance the charge transfer kinetics and photocatalytic activity of CdS by constructing plasmonic tandem heterogeneous junctions.

关键词： Cadmium sulfide

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基于模糊层次分析法的评价选优系统设计

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北京信息科技大学学报（自然科学版） 2017年第5期32卷 24-28,33页

作者：岳清郝保水侯霞北京信息科技大学计算机学院北京100101

构建了基于模糊层次分析法的综合评价选优系统。系统可根据用户实际需求自由搭建层次化评价指标体系,设计了一致性检验以保证指标权重的科学性,可利用模糊评价为评价方案的各项指标打分,最终完成评价和选优。同时系统还可以管理历史评... 详细信息

构建了基于模糊层次分析法的综合评价选优系统。系统可根据用户实际需求自由搭建层次化评价指标体系,设计了一致性检验以保证指标权重的科学性,可利用模糊评价为评价方案的各项指标打分,最终完成评价和选优。同时系统还可以管理历史评价模型和方案,为评价工作和管理工作提供数据支持。

关键词：层次分析法模糊分析评价选优

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