Time Dependent Recovery of Shape Memory Polymers

Castro, Francisco; Westbrook, Kristofer K.; Hermiller, Jason; Ahn, Dae Up; Ding, Yan; Hu, Qi

doi:10.1007/978-1-4419-9794-4_42

Cited by 2 publications

(5 citation statements)

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“…In (2010), Cmstro and others studied the affection of the shape recovery ratio (Rr) by recovery time and deformation temperature for (epoxy-based SMP) material through hot programming via compression loading. The shape recovery ratio value reached 100% during a small time heating due to applying temperature (which is greater than the deformation temperature) during the recovery stage [12].…”

Section: Engineering Materialsmentioning

confidence: 98%

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The Classification of the Stress-Strain Curve Zones on the Basis of their Validity to Study the Shape Memory Effect (SME) Property

Abbas

Al-Maamori

2022

KEM

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This study attempts to emphasize a pre-step for determining the permitted deformations (strains) extents. This is for changing the original molecular architecture shape for the materials understudy (rubber band/stearic acid (RB/based SA) and Rubber band without stearic acid (RB without SA)). It is necessary as a basic controlling step in the choosing process of the appropriate programming method to show the shape memory effect (SME) property. By this property, the polymers are either described as shape memory effect (SME) or conventional polymers. If the material was proved to have the shape memory effect (SME) property, then it will be allowed to predict many thermo-mechanical properties. So for these materials, the (stress-strain) curve zones have been classified according to the ability of the deformation history memory, which can be erased and programmed again after the immediate removement of the applied tensile force. This can be achieved by calculating the residual strain ratio. The comparative results showed that the elastic and plateau zones were classified respectively as valid for the study of the (SME) property. While for the Hardening strain and fracture zones, they were classified as bad and very bad respectively for the study of this property.

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Section: Engineering Materialsmentioning

confidence: 98%

“…As the figure (12) shows the process of visually macroscopic the SME characteristic by video imaging of RB/ based SA based on hot-classical programming at a temperature of 75°C.…”

Section: Warmmentioning

confidence: 99%

The Classification of the Stress-Strain Curve Zones on the Basis of their Validity to Study the Shape Memory Effect (SME) Property

Abbas

Al-Maamori

2022

KEM

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“…For CBCM, a recovery close to 100% is obtained at 90 • C, which proves that full recovery is possible at a temperature much lower than T F . However, this is not possible for the conventional SMPs and their composites, as described by Castro et al [27,28]. This is mainly due to the presence of the CBCM-effect in the CBCM composite which helps during recovery and makes the composite recover at lower temperature.…”

Section: Unconstrained Recovery Testmentioning

confidence: 99%

“…The last step is the most important step, which is studied in terms of recovery rate [26], recovery temperature (T R ) [27,28], recovery percentage, recovery forces produced [23], residual strain and irrecoverable strain during recovery [29].…”

Section: Introductionmentioning

confidence: 99%

“…Castro et al have studied the rate of recovery and recovery at lower temperature than T F . They have found that recovery is very low if T R is less than the T F and recovery is fast for a high rate of temperature [27,28]. In this work, we are introducing 'CBCM composite programmed through shape memory cycle', which provides the solutions for the problems described above.…”

Section: Introductionmentioning

confidence: 99%

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High actuation properties of shape memory polymer composite actuator

Basit¹,

L’Hostis²,

Durand³

2013

Smart Mater. Struct.

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The shape memory polymers (SMPs) possess two shapes: permanent shape and temporary shape. This property leads to replacement of shape memory alloys by SMPs in various applications. In this work, two properties, namely structure activeness and the shape memory property of ‘controlled behavior composite material (CBCM)’ plate and its comparison with the conventional symmetrical composite plate (SYM), are studied. The SMPC plates (CBCM and SYM) are manufactured using epoxy resin with a thermal glass transition temperature (Tg) of 130 °C. The shape memory properties of these composites are investigated (under three-point bending test) and compared by deforming them to the same displacement. Three types of recoveries are conducted: unconstrained recovery, constrained recovery, and partial recovery under load. It is found that by coupling the structure activeness (due to its asymmetry) and its shape memory property, higher activated displacement is obtained during the unconstrained recovery. Also, at a lower recovery temperature (90 °C) than the fixing temperature, a recovery close to 100% is obtained for CBCM, whereas for SYM it is only 25%. During constrained recovery, CBCM produces five times larger recovery force than SYM. In addition, higher actuation properties are demonstrated by calculating recovered work and recovery percentages during partial recovery under load.

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Time Dependent Recovery of Shape Memory Polymers

Cited by 2 publications

References 0 publications

The Classification of the Stress-Strain Curve Zones on the Basis of their Validity to Study the Shape Memory Effect (SME) Property

The Classification of the Stress-Strain Curve Zones on the Basis of their Validity to Study the Shape Memory Effect (SME) Property

High actuation properties of shape memory polymer composite actuator

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