Review on the Functional Determinants and Durability of Shape Memory Polymers

Pretsch, Thorsten

doi:10.3390/polym2030120

Cited by 112 publications

(72 citation statements)

References 272 publications

(339 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…A diverse array of SMPs have been developed that recover their permanent shape in response to light [2], magnetic fields [3], electricity [4], moisture [5], or pH [6] for a variety of industrial, aeronautical, and biomedical applications and can be reviewed elsewhere [1, 7, 8]. In contrast to their shape memory alloy counterparts, SMPs can be created with diverse, multi-functional chemistries to enable drastic yet highly-controllable shape responses to various stimuli [9-12]. SMPs that are thermo-responsive remain the most convenient and widely studied, drawing extensive interest in the biomedical field in part because of the high predictability and consistency of the body temperature stimulus [1, 13-15].…”

Section: Introductionmentioning

confidence: 99%

Pendant allyl crosslinking as a tunable shape memory actuator for vascular applications

et al. 2015

View full text Add to dashboard Cite

Thermo-responsive shape memory polymers (SMPs) can be fit into small-bore incisions and recover their functional shape upon deployment in the body. This property is of significant interest for developing the next generation of minimally-invasive medical devices. To be used in such applications, SMPs should exhibit adequate mechanical strengths that minimize adverse compliance mismatch-induced host responses (e.g. thrombosis, hyperplasia), be biodegradable, and demonstrate switch-like shape recovery near body temperature with favorable biocompatibility. Combinatorial approaches are essential in optimizing SMP material properties for a particular application. In this study, a new class of thermo-responsive SMPs with pendant, photocrosslinkable allyl groups, x%poly( -caprolactone)-co-y%( -allyl carboxylate -caprolactone) (x%PCL-y%ACPCL), are created in a robust, facile manner with readily tunable material properties. Thermomechanical and shape memory properties can be drastically altered through subtle changes in allyl composition. Molecular weight and gel content can also be altered in this combinatorial format to fine-tune material properties. Materials exhibit high elastic, switch-like shape recovery near 37 °C. Endothelial compatibility is comparable to tissue culture polystyrene (TCPS) and 100%PCL in vitro and vascular compatibility is demonstrated in vivo in a murine model of hindlimb ischemia, indicating promising suitability for vascular applications.

show abstract

Section: Introductionmentioning

confidence: 99%

Pendant allyl crosslinking as a tunable shape memory actuator for vascular applications

et al. 2015

View full text Add to dashboard Cite

show abstract

“…The hard segments of SMPU can be either chemical or physical cross-links, also known as SMPU thermosets or SMPU thermoplastics, respectively [ 22 ]. The chemical cross-links that are responsible for maintaining the permanent shape of SMPU may be formed via reactions between isocyanate and triol cross-linker or may arise from the chemical cross-links of the polyol chains itself.…”

Section: Structure and Shape Memory Effectmentioning

confidence: 99%

Polyurethane-Based Smart Polymers

Zain

Zubir

2016

Industrial Applications for Intelligent Polymers and Coatings

View full text Add to dashboard Cite

Polyurethane is a highly versatile polymer that may be used in various types of applications with a wide range of properties. The combination of different types and ratios of isocyanate and polyol allows for the control of the desired end properties. Due to its unique properties, it has found applications in the fi elds of medical, military, automobile, and aerospace industries. Recently, there has been a prodigious interest in producing polyurethane-based smart polymers, especially shape memory polyurethane (SMPU). This is due to its excellent ability to change shape upon the application of external stimuli such as heat, electric fi eld, magnetic fi eld, and light. The existence of phase-separated structure known as soft-and hard-segment domains contributes toward the shape memory properties of polyurethane. The soft-segment domains are responsible for maintaining the temporary shape, while hard segments fi x the permanent shape. This chapter comprehensively aims to address a wide overview of polyurethane-based smart polymer and the chemistry behind the shape memory properties. In addition, this chapter also summarizes the recent studies on the exploration of SMPU using vegetable oils along with petroleum-based polyol and the potential applications of smart polyurethane.

show abstract

“…As a result, most OEMs consider repairability a requirement from an economic perspective to efficiently deal with product failures during the product warranty period or to deal with products which fail while used in a PSS. Therefore, only the applicability of trigger signals for the initiation of a nondestructive AD process is explored in this article, excluding partially destructive triggers that have also been explored in prior research [20,24].…”

Section: Trigger Selection For Admentioning

confidence: 99%

Pressure-sensitive fasteners for active disassembly

Peeters

Bossche

Devoldere

et al. 2015

Int J Adv Manuf Technol

View full text Add to dashboard Cite

This paper presents a number of novel active fasteners developed to significantly lower disassembly costs during reconditioning, remanufacturing, and recycling of products. In the initial stage of the fastener development process, the applicability of distinct trigger signals for active disassembly (AD) is evaluated. Based on this evaluation, the high robustness of using a pressure increase or decrease as a nondestructive trigger for AD is demonstrated. Since previously proposed pressure-sensitive fasteners face considerable drawbacks upon implementation in electronic products due to the ongoing trend of miniaturization, a second generation of pressure-based active fasteners is developed. Evaluation of these fasteners by means of axiomatic design techniques and prototyping demonstrates that the presented snap-fits, which make use of a closed-cell elastomer foam, are most robust. Subsequently, the contraction forces that closed-celled foams can exert as a function of an increase in ambient air pressure are experimentally determined. Furthermore, the implementation of pressure-sensitive foam-based snap-fits in both a modem and a payment terminal is described. Results of these experiments demonstrate that the contraction force of a cross-linked metallocene polyethylene closed-cell foams can reach up to 6 N/cm 2 at an overpressure of 2 bar and that the foam-based snap-fits can be released at a pressure increase of 2 bar.

show abstract

Review on the Functional Determinants and Durability of Shape Memory Polymers

Cited by 112 publications

References 272 publications

Pendant allyl crosslinking as a tunable shape memory actuator for vascular applications

Pendant allyl crosslinking as a tunable shape memory actuator for vascular applications

Polyurethane-Based Smart Polymers

Pressure-sensitive fasteners for active disassembly

Contact Info

Product

Resources

About