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  • HOME
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    • Shape memory alloys >
      • Shape memory alloy actuators
      • Grains and deformation
      • SMA suppliers
    • Shape memory polymers >
      • Thermo-responsive >
        • Heating-responsive >
          • Thermo-plastic elastic SMP >
            • Body/room temperature programmable
          • Thermoset elastic SMP >
            • Body/room temperature programmable
          • Tailoring Tg of polymers via alloying
          • Vitrimer
          • 3D printing filaments
          • Show time
          • Body-temperature programmable elastic shape memory materials: a brief history
        • Cooling-responsive >
          • Cooling-responsive shape memory materials: a brief history
      • Chemo-responsive >
        • Electrospinning: fundametals
        • Natural biopolymers
        • Water-responsive SME: a brief history
      • Hydrogel
      • Simulation of SMP
    • Shape memory hybrids >
      • Electro-activated shape memory hybrid
      • SMHs: tailorable properties
      • Shape memory hybrids: a brief history
    • Triple/multiple SME
    • Reversible/shape change effect
    • Programming conditions
    • Temperature memory effect in DSC
    • Buckling 失稳
    • Constrained recovery of 2way EVA
    • Shape memory structures
    • Shape memory composites
    • Intro. & Refs. >
      • SME in commercial polymers
      • SMM introduction videos
      • PMMA (acrylic)
  • DIY
    • Laser engraving and beyond
    • DIY (step-by-step) to protect power charge cable 自制充电线接头保护层
    • DIY SMP screw 自制形状记忆螺丝
    • DIY shape memory foam 自制形状记忆海绵
    • DIY shape memory shoes 自制形状记忆鞋
    • Modifying superelastic Nitinol 超弹镍钛记忆合金改性
    • Goggles
    • Temple Tip Retainers /眼镜防滑钩
    • Nose pads
    • 硅胶+TPU样品制作 搅拌流程
    • Unlock smart phones
  • PROJECTS
    • Biomedical applications 生物医疗应用 >
      • Self-tightening band aid 自收缩创可贴
      • Self-tightening staple 自收缩手术钉
      • Shape memory plug 形状记忆栓塞
      • Artificial blood vessels
      • Comfort fitting 舒适贴合 >
        • Shape memory shoes 形状记忆鞋
        • Wrist rings/rings
        • Mask口罩 >
          • DIY口罩扣松紧器
          • Mask holder 口罩支架
          • Improved fitting
          • Comfort fitting "invisible" mask 舒适贴合“隐形”口罩 >
            • Animation (mask)
        • Facial mask (面膜)
      • Retractable 可收回
      • Wrinkle removal 除皱
    • SMA devices 形状记忆合金器件 >
      • Buttons-on-demand 按需按钮
      • Sunlight activated heat engine 阳光驱动的热机
      • Adjustable high heel 可调高跟鞋
      • SMA inchworm 形状记忆合金驱动的竹节虫
      • Rolling car 滚动车
      • SMA springs
      • Gripper
    • SMP applications >
      • 4D latte art 4D 拉花 >
        • Spinning 4D latte art
      • Re-writable Braille paper 可复写盲文纸
      • Surface patterning
      • 2D to 3D switching
      • Ear impression/plugs
    • Metals/polymers >
      • Smart manufacturing
      • Powerless cooling
      • Self-healing
      • Sensors 传感器 >
        • Temperature sensors 温度标签
        • Anti-counterfeit labels 防伪标签
      • Vertical gardening 垂直绿化 >
        • 盆景 >
          • In Singapore
        • Products 产品 >
          • Event sponsorship
        • Projects 项目 >
          • A project in Guangzhou (2022)
          • 2nd Project in Guangzhou
          • 3rd Project in Singapore
        • Water on-demand irrigation system
        • Vertical greening panel (2nd type)
        • 2nd type of foam
      • Wearable electronics 可穿戴电子设备
      • Controlled folding/unfolding 可控展开/折叠 >
        • Folding (multiple layered)
        • Reshape & reprogram
      • Active disassembly 自拆卸
      • Morphing wing 变翼
      • Magnetic circuit design
    • Solid state UV cross-linking >
      • Solid-state heating cross-linking
    • Additive manufacturing增材制造 >
      • 3D/4D printing 打印
      • Rapid 3D printing in solid state 快速固态3D打印 >
        • Rapid volumetric additive manufacturing in solid-state: hydrogels
        • UV cross-linkable vitrimer 2022
        • UV cross-linking of solid material
        • UV cross-linking machine
        • Solid-state VAM (3D)
        • SVAM: A brief history
        • Review of Solid state VAM by AI
      • New ways of additive manufacturing (animation)
      • UV-FDM printer
      • Cooling-responsive shape memory hydrogel via FDM
      • 3D fashion >
        • Formation of 3D structures
    • Shape capture
    • Surface capture >
      • Surface pattern for structural coloring
  • Store room
    • References/tools >
      • 3D models >
        • More STL models
        • 生肖
        • 3D printing service
      • Sample dimensions for tensile test
      • Temperature calibration
      • Toolbox工具箱
      • Toolbox II (工具箱 II)
    • Jungle >
      • About polymers >
        • Thermally reversible solid-liquid transition
        • Cyclic loading
        • Mullins effect
        • Photoelsticity 光弹
        • Shear-thickening 剪切增强 >
          • 4 CNA
        • Closed to open cell foams
        • Laser induced graphene
        • Electrospinning
        • Nano imprinting
        • Gel 凝胶 >
          • Instability in wetting of hydrogel
          • Electroactive gel电活性凝胶
        • Cellulose 纤维素
        • Plastic bottle 塑料瓶
        • Polymer recycling
        • Rapid swelling 快速溶胀
        • Rapid hardening in water
        • Patterns
        • Brittle-ductile transition
        • Tan delta >
          • Re-programmable Tan delta
        • UV cross-linking
        • Hardening speed
      • Coloring 变色 >
        • Structural coloring atop curved surfaces
        • Thermochromic 热致变色
        • Photochromic 光致变色
        • Stress induced color change力致变色 >
          • Patterned coloring via stretching 拉出色彩
      • Moire interference 莫尔干涉
      • Lenticular lens
      • Transformation front
      • Contact angle vs surface pattern
      • Laser: applications
      • Insects 昆虫
      • Structural engineer >
        • Static and Dynamic Balancing
        • Introduction videos
        • Bistable structures: a case study >
          • 3D printing of bistable structures
          • Step-wise morphing
        • Yield criterion >
          • Normalized yield surface via GPU
          • Yield surface of SMAs and beyond
        • Buckling of embedded threads
        • Buckling of embedded strip
        • Buckling of strip atop soft substrate
        • Foam structures for packaging
      • Interesting >
        • Exhibition
        • Ideas
      • Experimental >
        • Tensile test
        • Differential Scanning Calorimetry (DSC) Procedure
        • Dynamic Mechanical Analysis (DMA) Procedure
        • Shape Memory Performance Characterization Procedure for Shape Memory Polymers
      • ChatGPT 4 fun
      • 智谱测试
  • Contact
    • SMM course
    • Representative publications
    • Projects of undergraduate students
    • List of videos
    • Special issues| Conferences
    • Companies
    • References

Reversible/shape change

SMA


Picture
Picture
Training for two-way shape memory effect
​Training two-way shape memory alloy by reheat treatment
​On the long term stability of two-way shape memory alloy trained by reheat treatment
Picture

Polymeric material


Water induced (reshape-able permanent shape, bilayered structure )

Picture
(FYP) Foo SY

Two-way SMP based actuators
For two-way SMP: refer to https://doi.org/10.1016/j.compscitech.2019.01.020
Picture
Picture
(FYP) Yeo Y

Buckling in constrained recovery
Picture
Picture
Constrained recovery
35% pre-stretched at high temp.
After heating with the length fixed
Picture
Released from constraint
Picture
Picture
​40% pre-stretched
Between 30 Deg C water and 90 Deg C water
​Original speed
Speed 4x
​Between 0 Deg C (iced water)-95 Deg C water
BUckling in SMA wire

Picture
Prestretched and then fixed
Picture
Under cyclic Joule heating
Picture
Picture
Picture
​​Buckling of shape memory alloy wire  in constrained recovery upon thermal cycling
​(FYP) Melvern Lee

Picture

Acetone-responsive PET/TPU(transparency for printing/raincoat) bi-layered structure

Picture

Reference:
​Shape change/memory actuators based on shape memory materials, Journal of Mechanical Science and Technology, Vol. 31 (10), 2017, 4863-4873

​高分子结晶新视角—--受限结晶
​高分子在受限空间中的结晶能够显著改变高分子的结晶行为、晶体取向、晶型以及结晶动力学特性。这些独特的结晶特征在纳米材料和功能材料领域具有广泛的应用潜力。
例如,通过调控孔径和模板结构,可以控制高分子薄膜的晶体取向和结构,从而改善材料的机械性能、电性能和热性能。在生物材料、电子器件和能量存储设备(如锂离子电池)中,利用这种受限结晶行为能够制备高性能的纳米结构材料。但这些技术目前尚未实现大规模商业应用。
尽管受限空间结晶研究已取得显著进展,但仍存在一些尚未解决的问题和挑战。首先,高分子在受限空间中的结晶度和晶型受孔径、表面效应和温度等多种因素的复杂影响,具体的调控机制仍不完全清楚。并且受限空间中的成核和生长过程同时受到动力学和热力学因素的共同作用,而如何精确分离和理解这两种因素的影响尚需进一步研究[10]。
在高分子材料的受限结晶研究中,根据空间维度和几何形状的不同,受限环境主要可以分为以下几类:
一维受限空间
指材料被限制在一个狭窄的横截面中,而其长度方向相对自由。典型例子是纳米孔道和纳米纤维,其横向尺寸(直径)通常在纳米尺度上,而长度方向可以在微米或更大范围。
二维受限空间
指材料在厚度方向受到限制,而在平面方向上具有相对自由的延展。典型例子是薄膜或超薄涂层,其厚度通常在纳米级别。
三维受限空间
指材料在所有三个维度上均受到限制,通常具有球形或近似球形的封闭空间。典型例子是纳米粒子、微胶囊和液滴,特征尺寸在纳米级。
​参考文献
[1]Michell R M, Blaszczyk-Lezak I, Mijangos C, Müller A J. J Polym Sci, Part B: Polym Phys, 2014, 52(18): 1179 – 1194
[2]聂溪晗.激光透射AAO模板制备规整纳米结构工艺研究[D].天津科技大学,2021.DOI:10.27359/d.cnki.gtqgu.2021.000301.
[3]Duran H, Steinhart M, Butt H J, Floudas G. Nano Lett, 2011, 11(4): 1671 – 1675
[4]Carvalho J L, Dalnoki-Veress K. Phys Rev Lett, 2010, 105(23): 237801
[5]Su C, Chen Y, Shi G Y, Li T, Liu G M, Müller A J, Wang D J. Langmuir, 2019, 35(36): 11799 – 11808
[6]Shi G Y, Liu G M, Su C, Chen H M, Chen Y, Su Y L, Müller A J, Wang D J. Macromolecules, 2017, 50(22):9015 – 9023
[7] Su C, Shi G Y, Li X L, Zhang X Q, Müller A J, Wang D J, Liu G M. Macromolecules, 2018, 51(23): 9484 – 9493
[8]Müller A L, Arnal M L, Lorenzo A T. Crystallization in nano-confined polymeric systems in handbook of polymer crystallization. In: Piorkowska E, Rutledge G C, eds. Hoboken, New Jersey(USA): John Wiley and Sons, 2013.347 – 379
[9]Napolitano S, Wubbenhorst M. Macromolecules, 2006, 39(18): 5967 – 5970
[10]刘国明,施光宇,王笃金.高分子在氧化铝纳米孔道中受限结晶的研究进展[J].高分子学报,2020,51(05):501-516.

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  • HOME
  • SHAPE MEMORY MATERIALS/TECHNOLOGY
    • Shape memory alloys >
      • Shape memory alloy actuators
      • Grains and deformation
      • SMA suppliers
    • Shape memory polymers >
      • Thermo-responsive >
        • Heating-responsive >
          • Thermo-plastic elastic SMP >
            • Body/room temperature programmable
          • Thermoset elastic SMP >
            • Body/room temperature programmable
          • Tailoring Tg of polymers via alloying
          • Vitrimer
          • 3D printing filaments
          • Show time
          • Body-temperature programmable elastic shape memory materials: a brief history
        • Cooling-responsive >
          • Cooling-responsive shape memory materials: a brief history
      • Chemo-responsive >
        • Electrospinning: fundametals
        • Natural biopolymers
        • Water-responsive SME: a brief history
      • Hydrogel
      • Simulation of SMP
    • Shape memory hybrids >
      • Electro-activated shape memory hybrid
      • SMHs: tailorable properties
      • Shape memory hybrids: a brief history
    • Triple/multiple SME
    • Reversible/shape change effect
    • Programming conditions
    • Temperature memory effect in DSC
    • Buckling 失稳
    • Constrained recovery of 2way EVA
    • Shape memory structures
    • Shape memory composites
    • Intro. & Refs. >
      • SME in commercial polymers
      • SMM introduction videos
      • PMMA (acrylic)
  • DIY
    • Laser engraving and beyond
    • DIY (step-by-step) to protect power charge cable 自制充电线接头保护层
    • DIY SMP screw 自制形状记忆螺丝
    • DIY shape memory foam 自制形状记忆海绵
    • DIY shape memory shoes 自制形状记忆鞋
    • Modifying superelastic Nitinol 超弹镍钛记忆合金改性
    • Goggles
    • Temple Tip Retainers /眼镜防滑钩
    • Nose pads
    • 硅胶+TPU样品制作 搅拌流程
    • Unlock smart phones
  • PROJECTS
    • Biomedical applications 生物医疗应用 >
      • Self-tightening band aid 自收缩创可贴
      • Self-tightening staple 自收缩手术钉
      • Shape memory plug 形状记忆栓塞
      • Artificial blood vessels
      • Comfort fitting 舒适贴合 >
        • Shape memory shoes 形状记忆鞋
        • Wrist rings/rings
        • Mask口罩 >
          • DIY口罩扣松紧器
          • Mask holder 口罩支架
          • Improved fitting
          • Comfort fitting "invisible" mask 舒适贴合“隐形”口罩 >
            • Animation (mask)
        • Facial mask (面膜)
      • Retractable 可收回
      • Wrinkle removal 除皱
    • SMA devices 形状记忆合金器件 >
      • Buttons-on-demand 按需按钮
      • Sunlight activated heat engine 阳光驱动的热机
      • Adjustable high heel 可调高跟鞋
      • SMA inchworm 形状记忆合金驱动的竹节虫
      • Rolling car 滚动车
      • SMA springs
      • Gripper
    • SMP applications >
      • 4D latte art 4D 拉花 >
        • Spinning 4D latte art
      • Re-writable Braille paper 可复写盲文纸
      • Surface patterning
      • 2D to 3D switching
      • Ear impression/plugs
    • Metals/polymers >
      • Smart manufacturing
      • Powerless cooling
      • Self-healing
      • Sensors 传感器 >
        • Temperature sensors 温度标签
        • Anti-counterfeit labels 防伪标签
      • Vertical gardening 垂直绿化 >
        • 盆景 >
          • In Singapore
        • Products 产品 >
          • Event sponsorship
        • Projects 项目 >
          • A project in Guangzhou (2022)
          • 2nd Project in Guangzhou
          • 3rd Project in Singapore
        • Water on-demand irrigation system
        • Vertical greening panel (2nd type)
        • 2nd type of foam
      • Wearable electronics 可穿戴电子设备
      • Controlled folding/unfolding 可控展开/折叠 >
        • Folding (multiple layered)
        • Reshape & reprogram
      • Active disassembly 自拆卸
      • Morphing wing 变翼
      • Magnetic circuit design
    • Solid state UV cross-linking >
      • Solid-state heating cross-linking
    • Additive manufacturing增材制造 >
      • 3D/4D printing 打印
      • Rapid 3D printing in solid state 快速固态3D打印 >
        • Rapid volumetric additive manufacturing in solid-state: hydrogels
        • UV cross-linkable vitrimer 2022
        • UV cross-linking of solid material
        • UV cross-linking machine
        • Solid-state VAM (3D)
        • SVAM: A brief history
        • Review of Solid state VAM by AI
      • New ways of additive manufacturing (animation)
      • UV-FDM printer
      • Cooling-responsive shape memory hydrogel via FDM
      • 3D fashion >
        • Formation of 3D structures
    • Shape capture
    • Surface capture >
      • Surface pattern for structural coloring
  • Store room
    • References/tools >
      • 3D models >
        • More STL models
        • 生肖
        • 3D printing service
      • Sample dimensions for tensile test
      • Temperature calibration
      • Toolbox工具箱
      • Toolbox II (工具箱 II)
    • Jungle >
      • About polymers >
        • Thermally reversible solid-liquid transition
        • Cyclic loading
        • Mullins effect
        • Photoelsticity 光弹
        • Shear-thickening 剪切增强 >
          • 4 CNA
        • Closed to open cell foams
        • Laser induced graphene
        • Electrospinning
        • Nano imprinting
        • Gel 凝胶 >
          • Instability in wetting of hydrogel
          • Electroactive gel电活性凝胶
        • Cellulose 纤维素
        • Plastic bottle 塑料瓶
        • Polymer recycling
        • Rapid swelling 快速溶胀
        • Rapid hardening in water
        • Patterns
        • Brittle-ductile transition
        • Tan delta >
          • Re-programmable Tan delta
        • UV cross-linking
        • Hardening speed
      • Coloring 变色 >
        • Structural coloring atop curved surfaces
        • Thermochromic 热致变色
        • Photochromic 光致变色
        • Stress induced color change力致变色 >
          • Patterned coloring via stretching 拉出色彩
      • Moire interference 莫尔干涉
      • Lenticular lens
      • Transformation front
      • Contact angle vs surface pattern
      • Laser: applications
      • Insects 昆虫
      • Structural engineer >
        • Static and Dynamic Balancing
        • Introduction videos
        • Bistable structures: a case study >
          • 3D printing of bistable structures
          • Step-wise morphing
        • Yield criterion >
          • Normalized yield surface via GPU
          • Yield surface of SMAs and beyond
        • Buckling of embedded threads
        • Buckling of embedded strip
        • Buckling of strip atop soft substrate
        • Foam structures for packaging
      • Interesting >
        • Exhibition
        • Ideas
      • Experimental >
        • Tensile test
        • Differential Scanning Calorimetry (DSC) Procedure
        • Dynamic Mechanical Analysis (DMA) Procedure
        • Shape Memory Performance Characterization Procedure for Shape Memory Polymers
      • ChatGPT 4 fun
      • 智谱测试
  • Contact
    • SMM course
    • Representative publications
    • Projects of undergraduate students
    • List of videos
    • Special issues| Conferences
    • Companies
    • References