Shape memory polymer foams prepared from a heparin-inspired polyurethane/urea

Chai, Qinyuan; Huang, Yongshun; Kirley, Terence L.; Ayres, Neil

doi:10.1039/c7py00204a

Cited by 19 publications

(25 citation statements)

References 61 publications

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“…SMP polymer foams were prepared using our published protocols . Briefly, a diisocyanate‐terminated prepolymer was prepared by reacting a lactose‐functionalized diamine (0.22 mmol, 0.300 g) with excess isophorone diisocyanate (IPDI) (1.48 mmol, 0.327 g) in dichloromethane.…”

Section: Methodsmentioning

confidence: 99%

“…In our previous work, linear polyureas with sulfated sugars showed effective anticoagulant properties by prolonging blood clotting in solution. Subsequently, these sugar‐functionalized polyureas and poly(ethylene glycol) were covalently cross‐linked and prepared as SMP films and foams . Platelet adhesion tests indicated excellent blood compatibility of these shape memory material surfaces …”

Section: Introductionmentioning

confidence: 99%

“…Subsequently, these sugar‐functionalized polyureas and poly(ethylene glycol) were covalently cross‐linked and prepared as SMP films and foams . Platelet adhesion tests indicated excellent blood compatibility of these shape memory material surfaces …”

Section: Introductionmentioning

confidence: 99%

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Hydrogel‐coated polyurethane/urea shape memory polymer foams

Dalton

Chai

Shaw

et al. 2019

J. Polym. Sci. Part A: Polym. Chem.

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Shape memory polymers (SMPs) are a class of responsive polymers that have attracted attention in designing biomedical devices because of their potential to improve minimally invasive surgeries. Use of porous SMPs in vascular grafts has been proposed because porosity aids in transfer of fluids through the graft and growth of vascular tissue. However, porosity also allows blood to leak through grafts so preclotting the materials is necessary. Here hydrogels have been synthesized from acrylic acid and N‐hydroxyethyl acrylamide and coated around a porous SMP produced from lactose functionalized polyurea‐urethanes. The biocompatibility of the polymers used to prepare the cross‐linked shape memory material is demonstrated using an in vitro cell assay. As expected, the hydrogel coating enhanced fluid uptake abilities without hindering the shape memory properties. These results indicate that hydrogels can be used in porous SMP materials without inhibiting the shape recovery of the material. © 2019 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2019, 57, 1389–1395

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hydrogel‐coated polyurethane/urea shape memory polymer foams

Dalton

Chai

Shaw

et al. 2019

J. Polym. Sci. Part A: Polym. Chem.

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“…Therefore, having a special terminal groups of MBCs which can be used as thermosetting material were not yet received much attention and research. As is well known, the preparation of α,ω‐dihydroxy polymers has been a hot subject of investigation for several decades owing to their diverse applications in the fields of adhesives and biomedical and elastomeric materials . However, so far, the syntheses of α,ω‐dihydroxy block copolymers were mainly on di‐ and triblock copolymers via living polymerization .…”

Section: The Synthesis Of Mbcs Using Different Macromonomersmentioning

confidence: 99%

A New Strategy to Synthesize α,ω‐Dihydroxy Multiblock Copolymers via [CpRu(CH₃CN)₃]PF₆/Quinaldic Acid Catalyst

Zhu

Wang

Liu

et al. 2019

Macromol. Rapid Commun.

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In this study, a new strategy to synthesize random and alternating multiblock copolymers (MBCs) by the polycondensation of macromonomers’ terminal hydroxyl groups with [CpRu(CH3CN)3]PF6/quinaldic acid as the catalyst is reported, which is often used for the preparation of a variety of biological small molecules via the reaction of allyl ethers. The degrees of hydroxyl functionality (Fn) of the MBCs are assessed by titration, and the presence of hydroxyl on both the ends of MBCs is also confirmed by a chain‐extension experiment of the ring‐opening polymerization of D,L‐lactide.

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“…Depending on the microstructures, SMPs can be further categorized into covalently/physically cross‐linked polymer networks or polymer blends . In cross‐linked SMPs the soft phase function as the recovery switch whereas the cross‐linked nodes in the hard phases act as the memory for the permanent shape.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Electroactive Shape Memory Polymer Composites with Room Temperature Deformability

Sun

Chu

Huang

et al. 2019

Macro Materials & Eng

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Polymeric blend shape memory polymers (SMPs) can be constructed from two immiscible polymeric matrices. The shape recovery behavior of these composite systems can be easily controlled by varying the ratio of the polymer blends. It has been recently discovered that the functionality of SMPs can be further enhanced with electroactive ability through the use of conductive fillers. However, the fillers may negatively interact with the SMPs and cause a reduction in the elongation at failure thereby diminishing the shape recovery performance. It is proposed that a plasticizer can be utilized to alter the microstructure of the SMPs with conductive fillers. In this study, a new hybrid SMP is developed by combining single‐walled carbon nanotubes (SWCNT) into a poly(lactic acid) (PLA) and thermoplastic polyurethane (TPU) SMP system containing poly(ethylene glycol) (PEG) plasticizer. The incorporation of PEG is able to lower the activation temperature, while enhancing dispersion of SWCNT. The presence of SWCNT can stabilize the SMP system and significantly enhance the shape‐fixing capability after deformation at room temperature conditions. By carefully controlling the formulation, an electroactive SMP can be created by optimizing the amount of SWCNT and PEG plasticizer.

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Shape memory polymer foams prepared from a heparin-inspired polyurethane/urea

Abstract: Shape memory foams have been prepared using a heparin-inspired polyurea/urethane that displays excellent resistance to platelet adherence.

Cited by 19 publications

References 61 publications

Hydrogel‐coated polyurethane/urea shape memory polymer foams

Hydrogel‐coated polyurethane/urea shape memory polymer foams

A New Strategy to Synthesize α,ω‐Dihydroxy Multiblock Copolymers via [CpRu(CH₃CN)₃]PF₆/Quinaldic Acid Catalyst

Hybrid Electroactive Shape Memory Polymer Composites with Room Temperature Deformability

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Shape memory polymer foams prepared from a heparin-inspired polyurethane/urea

Abstract: Shape memory foams have been prepared using a heparin-inspired polyurea/urethane that displays excellent resistance to platelet adherence.

Cited by 19 publications

References 61 publications

Hydrogel‐coated polyurethane/urea shape memory polymer foams

Hydrogel‐coated polyurethane/urea shape memory polymer foams

A New Strategy to Synthesize α,ω‐Dihydroxy Multiblock Copolymers via [CpRu(CH3CN)3]PF6/Quinaldic Acid Catalyst

Hybrid Electroactive Shape Memory Polymer Composites with Room Temperature Deformability

Contact Info

Product

Resources

About

A New Strategy to Synthesize α,ω‐Dihydroxy Multiblock Copolymers via [CpRu(CH₃CN)₃]PF₆/Quinaldic Acid Catalyst