Magdalena Laskowska

SHAPE MEMORY POLYMERS

AGENDA Introduction and definiton

Types

Materials

How it works

WHAT ARE SHAPE MEMORY MATERIALS? „Remember” the orginal shape even after undergoing siginificant deformation

Rever back to orginal shape by a suitable trigger:

- Most common trigger: heating above a recovery temeprature

- Other tiggers: Magnetic fields, electromagnetic radiation etc.

OVERVIEW OF SMP Mechanism for „remembering” orginal shape and transiet shape:

- Common mechanisms:

Entanglements, Crosslinks and hard-domains.

- Transiet shape fixed usually with crystalline phase or

the glassy state.

OVERVIWE OF SMP Revert bact to orginal shape by heating.

-Heating above Tm( if the crystalline phase is used to fix

the transient shape)

- Heating above Tg( of the glassy phase is used to fix the

transient shape)

HOW SHAPE MEMORY POLYMERS WORK

TYPES OF SHAPE MEMORY MATERIALS Shape Memory Alloys (SMA)

Extensive work has been crried out in the last 10 years.

Constitutive equations and modeling fairly well developed

Shape Memory Polymers (SMP)

Advantages - SM effect can be seen for large deformation - Manufacturing methods are conventional and cheap- Recovery temperature can be adjustedDisadventagesActuation forse (SMP)<<Actuation force(SMA)

APPLICATIONS

APPLICATIONS

APPLICATIONS SMP fibers for comfort wear MEMS devixes, temperature sensors Damping elements Intravenouse needles and implantable Medical device Films and fibers used in insulation Morphing Aircraft Wings Rewritable digital storage devices

THANK YOU!!!