Castor oil and PEG-based shape memory polyurethane films: effect of chain extender amount on some polymer properties and performance

A novel type of shape memory polyurethane (SMPU) with high mechanical properties and biodegradability was constructed using a lactone copolymer (poly(ε-caprolactone-co-γ-butyrolactone), PCLBL), a diol- or triol-based chain extender (1,5-pentanediol, glycerol and 2-amino-2-hydroxymethyl-1,3-propanediol) and a diisocyanate cross-linker (1,6-hexamethylene diisocyanate).

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Microwave–Induced Thermo-Responsive Shape Memory Polyurethane/MWCNTs Composites and Improved their Shape Memory and Mechanical Properties

JOURNAL OF POLYMER MATERIALS ◽

10.32381/jpm.2019.36.01.3 ◽

2019 ◽

Vol 36 (1) ◽

pp. 23-37

Author(s):

KRISHAN KUMAR PATEL ◽

◽

RAJESH PUROHIT ◽

Keyword(s):

Mechanical Properties ◽

Shape Memory ◽

Shape Memory Polyurethane

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Effect of chain extender on microphase structure and performance of self‐healing polyurethane and poly(urethane‐urea)

Journal of Applied Polymer Science ◽

10.1002/app.51371 ◽

2021 ◽

pp. 51371

Author(s):

Yulong Wang ◽

Yaqiong Li ◽

Maoyong He ◽

Jingjing Bai ◽

Bingxiao Liu ◽

...

Keyword(s):

Chain Extender ◽

Self Healing ◽

And Performance

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Three-dimensional Graphene Coated Shape Memory Polyurethane Foam with Fast Responsive Performance

Journal of Materials Chemistry C ◽

10.1039/d1tc01315g ◽

2021 ◽

Author(s):

Tianjiao Wang ◽

Jun Zhao ◽

Chuanxin Weng ◽

Tong Wang ◽

Yayun Liu ◽

...

Keyword(s):

Shape Memory ◽

Polyurethane Foam ◽

Three Dimensional ◽

Shape Memory Polymers ◽

Practical Applications ◽

External Stimuli ◽

Shape Memory Polyurethane

Shape memory polymers (SMPs) that change shapes as designed by external stimuli have become one of the most promising materials as actuators, sensors, and deployable devices. However, their practical applications...

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Laboratory-Scale Processing and Performance Assessment of Ti–Ta High-Temperature Shape Memory Spring Actuators

Shape Memory and Superelasticity ◽

10.1007/s40830-021-00334-1 ◽

2021 ◽

Author(s):

A. Paulsen ◽

H. Dumlu ◽

D. Piorunek ◽

D. Langenkämper ◽

J. Frenzel ◽

...

Keyword(s):

High Temperature ◽

Shape Memory ◽

Detrimental Effect ◽

Wire Drawing ◽

Fast Heating ◽

Heating And Cooling ◽

Arc Melting ◽

Ω Phase ◽

And Performance

AbstractTi75Ta25 high-temperature shape memory alloys exhibit a number of features which make it difficult to use them as spring actuators. These include the high melting point of Ta (close to 3000 °C), the affinity of Ti to oxygen which leads to the formation of brittle α-case layers and the tendency to precipitate the ω-phase, which suppresses the martensitic transformation. The present work represents a case study which shows how one can overcome these issues and manufacture high quality Ti75Ta25 tensile spring actuators. The work focusses on processing (arc melting, arc welding, wire drawing, surface treatments and actuator spring geometry setting) and on cyclic actuator testing. It is shown how one can minimize the detrimental effect of ω-phase formation and ensure stable high-temperature actuation by fast heating and cooling and by intermediate rejuvenation anneals. The results are discussed on the basis of fundamental Ti–Ta metallurgy and in the light of Ni–Ti spring actuator performance.

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