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Shape Memory Polymers:Ever Evolving Shape Morphing Characteristics

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Chinese Journal of Polymer Science 2023年第3期41卷 325-326页

作者： Tao Xie State Key Laboratory of chemical engineering College of Chemical and Biological EngineeringZhejiang University

Shape memory effect (SME) of polymers refers to their ability to fix temporary shapes and revert to their permanent shapes in an on demand fashion.Whereas the permanent shape is typically determined by the molding processes,the temporary shape(s) can be arbitrarily defined by an external force applied during the programming step(or shape fixing step).This attribute differentiates shape memory polymers (SMP) from many other classes of stimuli-responsive shape-changing polymers,in terms of both the material behaviors and potential applications.

关键词： permanent arbitrarily programming

硅烷偶联剂处理铜箔用作高性能硅负极铜集流体

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Journal of Central South University 2022年第11期29卷 3620-3629页

作者：孟祥娟曾小敏蒋伟李嗣源杜乔昆季泽楷朱伟伟刘创梁成都凌敏严立京 college of chemical and biological engineering Zhejiang UniversityHangzhou 310027China

采用了一种简单的铜集流体表面改性方法,成功在硅负极和集流体之间引入化学键作用力,以缓解硅在循环过程由于体积变化过大从集流体上脱出的问题。DAMO的涂覆使Cu^(*)表面负载氨基官能团。氨基官能团增加铜箔表面的亲水性,有利于以水作... 详细信息

采用了一种简单的铜集流体表面改性方法,成功在硅负极和集流体之间引入化学键作用力,以缓解硅在循环过程由于体积变化过大从集流体上脱出的问题。DAMO的涂覆使Cu^(*)表面负载氨基官能团。氨基官能团增加铜箔表面的亲水性,有利于以水作为溶剂的浆料在铜箔表面的固化过程。同时,氨基可以和黏结剂中羧基形成酰胺键,在铜集流体和硅负极之间构建化学键作用力。但高浓度的DAMO改变了铜箔表面形貌,降低了表面粗糙度,只能提供单纯的化学键作用力。同时,DAMO的绝缘性也降低了铜箔的导电性,增加了电池的阻抗。综合以上考虑DAMO膜的作用,当DAMO的浓度为0.05 wt%时,Cu^(*)表面既能保留机械互锁力,又可以提供化学键作用力,电极中集流体和活性层界面黏结强度增加,Si-Cu^(*)−0.05%的倍率性能和循环性能明显增强,循环100次之后,容量保持率为60%,比采用裸铜的硅电极电化学性能提升25%。

关键词：锂离子电池硅负极铜集流体表面改性

State of the Art and Prospects in Metal-Organic Framework-Derived Microwave Absorption Materials

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Nano-Micro Letters 2022年第4期14卷 238-276页

作者： Shuning Ren Haojie Yu Li Wang Zhikun Huang Tengfei Lin Yudi Huang Jian Yang Yichuan Hong Jinyi Liu State Key Laboratory of chemical engineering College of Chemical and Biological EngineeringZhejiang UniversityHangzhou 310027People’s Republic of China

Microwave has been widely used in many fields,including communication,medical treatment and military industry;however,the corresponding generated radiations have been novel hazardous sources of pollution threating human’s daily life.Therefore,designing high-performance microwave absorption materials(MAMs)has become an indispensable requirement.Recently,metal-organic frameworks(MOFs)have been considered as one of the most ideal precursor candidates of MAMs because of their tunable structure,high porosity and large specific surface area.Usually,MOF-derived MAMs exhibit excellent electrical conductivity,good magnetism and sufficient defects and interfaces,providing obvious merits in both impedance matching and microwave loss.In this review,the recent research progresses on MOF-derived MAMs were profoundly reviewed,including the categories of MOFs and MOF composites precursors,design principles,preparation methods and the relationship between mechanisms of microwave absorption and microstructures of MAMs.Finally,the current challenges and prospects for future opportunities of MOF-derived MAMs are also discussed.

关键词： Microwave absorption materials Metal-organic frameworks Preparation methods Mechanisms of microwave absorption

Recent Progress of Bio-inspired Camouflage Materials:From Visible to Infrared Range

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chemical Research in Chinese Universities 2023年第1期39卷 19-29页

作者： BU Xiaochen BAI Hao State Key Laboratory of chemical engineering College of Chemical and Biological EngineeringZhejiang UniversityHangzhou310027China

The adaptability of biological organisms to the environment is reflected in many aspects,especially in their camouflage of appearance.Inspired by biological camouflage strategies,a number of adaptive camouflage materials and devices have been developed to protect soldiers,vehicles,or equipment in the military.Today,the need for adaptive camouflage extends into people’s lives,whose privacy and information security need to be protected in the era of big data.Herein,a review is provided on the recent advancements of adaptive camouflage from the perspective of biological organisms and bio-inspired materials.Firstly,according to different biological mechanisms,we review the typical organisms that use pigmentary color,structural color,and morphological variation for adaptive camouflage,as well as those combine these strategies.Then,we provide an up-to-date review on recent developments in bio-inspired adaptive camouflage materials and devices with an emphasis on visible,infrared,and multispectral camouflage.At last,this review concludes the challenges and prospects for the future development of adaptive camouflage materials.It is noteworthy that there is never the best camouflage.To counter advanced detection techniques,it is necessary to unremittingly develop new materials and technologies to meet the increasing need for adaptive camouflage.

关键词： Bio-inspired material Adaptive camouflage Infrared camouflage Multispectral adaptability Structural color

Separation of light hydrocarbons with ionic liquids: A review

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Chinese Journal of chemical engineering 2019年第6期27卷 1374-1382页

作者： Yuqi Huang Yuanbin Zhang Huabin Xing college of chemical and biological engineering Zhejiang University

Light hydrocarbons(C1–C4) are fundamental raw materials in the petroleum and chemical industry. Separation and purification of structurally similar paraffin/olefin/alkyne mixtures are important for the production of highpurity or even polymer-grade light hydrocarbons. However, traditional methods such as cryogenic distillation and solvent absorption are energy-intensive and environmentally unfriendly processes. Ionic liquids(ILs) as a new alternative to organic solvents have been proposed as promising green media for light hydrocarbon separation due to their unique tunable structures and physicochemical properties resulting from the variations of the cations and anions such as low volatility, high thermal stability, large liquidus range, good miscibility with light hydrocarbons, excellent molecular recognition ability and adjustable hydrophylicity/hydrophobicity. In this review, the recent progresses on the light hydrocarbon separation using ILs are summarized, and some parameters of ILs that influence the separation performance are discussed.

关键词： Ionic liquids Hydrocarbons Absorption Sepatation Solubility

Hydrodynamic Instability Analysis of the Axial Flow Pump in an Ethylene Polymerization Loop Reactor

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China Petroleum Processing & Petrochemical Technology 2022年第1期24卷 135-148页

作者： Lu Jin Yang Yao Sun Jingyuan Huang Zhengliang Yang Yongrong Wang Jingdai Zhejiang Provincial Key Laboratory of Advanced chemical engineering Manufacture Technology College of Chemical and Biological EngineeringZhejiang UniversityHangzhou 310058 State Key Laboratory of chemical engineering College of Chemical and Biological EngineeringZhejiang UniversityHangzhou 310058

The hydrodynamic instability of the axial flow pump in a loop reactor has long been a troubling issue to be solved in the polyethylene industry due to the lack of a better mechanismic understanding.Generally,the instability of an axial flow pump can be reflected by the fluctuation of the pump head.In this study,the transient computational fluid dynamics(CFD)simulation is adopted to study the hydrodynamic instability of the axial flow pump used in an ethylene polymerization loop reactor.The results show that the pump head under single liquid phase nearly remains constant while the pump head under slurry phase fluctuates due to the variation of solid volume fraction distribution in the pump.Besides,under the combined effect of the maximum solid volume fraction difference in the pump and the turbulence intensity of the liquid phase,the fluctuation of the pump head under slurry phase increases when the solid volume fraction in the loop reactor increases from 0.10 to 0.29,and the fluctuation decreases,when the solid volume fraction increases from 0.29 to 0.35.Furthermore,there is a negative correlation between the pump head and the solid volume fraction in the pump;with the increase of solid volume fraction in the loop reactor,and the correlation coefficient increases as well.Moreover,a‘spiral particulate band’phenomenon is formed in the ascending leg caused by three mechanisms,viz.:the segregation of particles in all bends,the dispersion of particles by the secondary flow in the ascending leg,and the rotational movement of particles in the pump.

关键词： axial flow pump loop reactor CFD hydrodynamic instability polyethylene

阴离子功能化超交联离子多孔聚合物的构建及生物活性物质高效分离

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Science China Materials 2022年第4期65卷 1068-1075页

作者：锁显黄玉琦李侦糠潘罕骞崔希利邢华斌 Key Laboratory of Biomass chemical engineering of Ministry of Education College of Chemical and Biological EngineeringZhejiang UniversityHangzhou310027China

多孔离子聚合物由于其独特的分子识别能力在高效分离中表现出巨大的潜力,但制备阴离子功能化离子聚合物用于结构高度相似生物活性物质分离仍然具有挑战.本文通过苄基咪唑离子液体与交联剂发生简易的Friedel-Crafts烷基化反应,报道了一... 详细信息

多孔离子聚合物由于其独特的分子识别能力在高效分离中表现出巨大的潜力,但制备阴离子功能化离子聚合物用于结构高度相似生物活性物质分离仍然具有挑战.本文通过苄基咪唑离子液体与交联剂发生简易的Friedel-Crafts烷基化反应,报道了一类具有强碱羧酸阴离子功能化、管状形貌和高热稳定性的超交联离子多孔聚合物(HIPs).实现了对结构高度相似的生物活性化合物的高容量(生育酚同系物:103.6 mg g^(−1))和高选择性(S_(βγ/α),4.26;S_(δ/α),3.19)吸附分离,其性能优于商业吸附剂、不含离子液体的超交联聚合物和含常规离子液体的HIPs.本研究展示了功能化吸附剂新的合成策略和合理的分子设计,为实现高效分离提供了新的机会.

关键词： anion-functionalization hypercrosslink porous ionic polymers adsorption tocopherol homologues phenolic compounds

Bi-/multi-modal pore formation of PLGA/hydroxyapatite composite scaffolds by heterogeneous nucleation in supercritical CO_2 foaming

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Chinese Journal of chemical engineering 2018年第1期26卷 207-212页

作者： Xin Xin Yixin Guan Shanjing Yao college of chemical and biological engineering Zhejiang University

Scaffolds with multimodal pore structure are essential to cells differentiation and proliferation in bone tissue engineering.Bi-/multi-modal porous PLGA/hydroxyapatite composite scaffolds were prepared by supercritical CO_2 foaming in which hydroxyapatite acted as heterogeneous nucleation agent.Bimodal porous scaffolds were prepared under certain conditions,i.***.hydroxyapatite addition of 5%,depressurization rate of 0.3 MPa·min^(-1),soaking temperature of 55℃,and pressure of 9 MPa.And scaffolds presented specific structure of small pores(122 μm±66 μm)in the cellular walls of large pores(552μm±127μm).Furthermore,multimodal porous PLGA scaffolds with micro-pores(37 μm±11 μm)were obtained at low soaking pressure of 7.5 MPa.The interconnected porosity of scaffolds ranged from(52.53±2.69)% to(83.08±2.42)%by adjusting depressurization rate,while compression modulus satisfied the requirement of bone tissue engineering.Solvent-free CO_2 foaming method is promising to fabricate bi-/multi-modal porous scaffolds in one step,and bioactive particles for osteogenesis could serve as nucleation agents.

关键词：脚手架 CO2 成核泡沫异构合成孔形浸泡温度

A Soft Shape Memory Reversible Dry Adhesive

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Chinese Journal of Polymer Science 2018年第8期36卷 953-959页

作者： Jian-Te Dong Wei-Ke Zou Feng Chen Qian Zhao college of chemical and biological engineering Zhejiang University

Transfer printing is a critical procedure for manufacturing stretchable electronics. During such a procedure, stamps are utilized to transfer micro devices from silicon wafers to stretchable polymeric substrates. In addition to conventional silicone rubber stamps, epoxy resin based shape memory stamps have been developed and the transfer yield is thus significantly promoted. However, elastic modulus of the epoxy stamps is too high at both glassy and rubbery states, which may break the brittle micro devices during the adhesion process under mechanical pressure. In this work, we synthesized a copolymer of butyl acrylate （BA） and polycaprolactone diacrylate （PCLDA） as a soft reversible dry adhesive enabling a shape memory capability based on crystalline transition ofpolycaprolactone （PCL） segments. For the sample containing 40 wt% BA and 60 wt% PCLDA, Young＇s modulus was 8.3 and 0.9 MPa respectively below and above the thermal transition temperature, which was much lower than that of the epoxy adhesive. On the other hand, the soft material still provided nearly ideal shape memory fixity and recovery ratios. Subsequently, shape memory surface with cone-shaped microstructure was prepared, which enabled a heating induced strong-to-weak adhesion transition when the microstructure recovered from a pressed temporary morphology to the permanent cone-shaped morphology. Such a soft reversible dry adhesive may contribute to large-scale and automated transfer printing processing.

关键词： Stretchable electronics Shape memory polymers Reversible adhesives