1. New type of shape memory polymer
Young Kwang Nam
Yeon chan Lim
Ah young Kim
Hyung hun An

2. Comparison of Young’s modulus as a function of temperature
SMP : Shape memory polymer
EAP : Electroactive polymer
Young’s Modulus = E
T E
During shape recovery, E decreases
Kailiang Ren, Robert S. Bortolin, and Q. M. Zhang “An investigation of a thermally steerable electroactive polymer/shape memory polymer hybrid actuator”, 2015

3. T Yield stress Comparison of yield stress as a function of temperature
H. Tobushi, S. Hayashi2, Y. Sugimoto, c and K. Date1“Performance of shape memory composite with SMA and SMP”, 2009

4. Comparison between shape retention ratio and the extent of stress relaxation.
R(ret) : shape retention
R(𝜎) : stress relaxation
R(𝜎) = 100% ×(1− 𝜎/ 𝜎 0 )
Qian Zhao, Weike Zou, Yingwu Luo, Tao Xie “Shape memory polymer network with thermally distinct elasticity and plasticity, “,2016

5. Sensitive on Tg Difficulty in recovery from external force
Tan delta curve for polymer
viscosity
Tan delta= 𝐿𝑜𝑠𝑠 𝑚𝑜𝑑𝑢𝑙𝑢𝑠 𝑠𝑡𝑜𝑟𝑎𝑔𝑒 𝑚𝑜𝑑𝑢𝑙𝑢𝑠
elasticity
Tan delta Recovery ratio
Sensitive on Tg
Difficulty in recovery from external force
Ryan D. Siskinda and Ralph C. Smith “Model Development for Shape Memory Polymers”, 2006

6. Making specimens SMP resin Solute SMP Composites Filament extruders
3d printer filament

7. Reinforcement of shape memory polymers
Reinforcement by microfibers, fabrics, and mats
Reinforcement by carbon nanotubes (CNTs) or carbon nanofibers (CNFs)
Reinforcement by exfoliated nanoclay
Reinforcement by SiC or SiO2 particles
Reinforcement by cellulose nanowhiskers
Harper Meng, A review of stimuli-responsive shape memory polymer composites, 2013, Polymer

8. Buy composites Milled fiber glass Milled carbon fiber Powder
Specification
- Average filament diameter (𝜇𝑚) : 13.5
- Average fiber length (𝜇𝑚) : 300
- Density (g/ 𝑐𝑚 3 ) : 2.58
\ 12,700 / 800 g
Milled carbon fiber Powder
Specification
- Average filament diameter (𝜇𝑚) : 7~10
- Average fiber length (𝜇𝑚) : 100
- Density (g/ 𝑐𝑚 3 ) : 1.6
\ 184,560 / 1 kg
SiC Powder
Specification
- Average powder diameter (𝜇𝑚) : 6
- Shape : powder
- Density (g/ 𝑐𝑚 3 ) : 3.22
\ 232,000 / 1 kg

9. Young’s modulus related composites
Glass fiber
Carbon fiber
SiC
Glass fiber
Takeru Ohki, Mechanical and shape memory behavior of composites with shape memory polymer, 2004, Composites Part A
Qing-Qing Ni, Shape memory effect and mechanical properties of carbon nanotube/shape memory polymer nanocomposites, 2007, Composite Structures
Ken Gall, Shape memory polymer nanocomposites, 2002, Acta Materialia

10. Rigidity N Recovery ratio Recovery ratio Revovery ratio of glass
fiber containing shape memory composite
Rigidity
Recovery ratio
N Recovery ratio
Jinho Hong, Ju Ho Yun Il Kim, and Sang Eun Shim”Shape Memory Polymer Nanocomposites”,2010

11. Young’s modulus of ratio of silica
By adding C SiC
Less decrease of recovery ratio
Increase of rigidity
Hua Zou, Shishan Wu, and Jian Shen “Polymer/Silica Nanocomposites: Preparation, Characterization, Properties, and Applications”, 2008

12. Shape recovery rate of mixture of SiC with SMP
Image of the unconstrained bend
Shape recovery rate of mixture of SiC with SMP
Jinho Hong, Ju Ho Yun Il Kim, and Sang Eun Shim”Shape Memory Polymer Nanocomposites”,2010

13. Q & A