Shape Memory Polymer Thin Films Deposited by Initiated Chemical Vapor Deposition

Kramer, Nicolaas J.; Sachteleben, E.; İnce, Gözde Özaydın; Sanden, M.C.M. van de; Gleason, Karen K.

doi:10.1021/ma101644w

Cited by 11 publications

(8 citation statements)

References 20 publications

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“…The rubbery storage modulus increased as the PEGDMA content increased in line with work with related systems (Gall et al, 2005;Kramer et al, 2010;Ortega et al, 2008).…”

Section: Dynamic Mechanical Analysissupporting

confidence: 80%

“…Note that the 100-fold reduction in the storage modulus of the t90/P10 to t15/ P15 networks provided good evidence for useful shape memory ability (Du and Zhang, 2010;Tsai et al, 2008). The increase in storage modulus as the PEGDMA content increased was anticipated as was the associated increase in the rubbery modulus (Kramer et al, 2010).…”

Section: Dynamic Mechanical Analysismentioning

confidence: 87%

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The effect of organoclay addition on the properties of an acrylate based, thermally activated shape memory polymer

Barwood

Breen

Clegg

et al. 2014

Applied Clay Science

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Shape Memory Polymers (SMPs) exhibit the intriguing ability to change back from an intermediate, deformed shape back to their original, permanent shape. In this contribution a systematic series of t-butylacrylate-copoly(ethyleneglycol) dimethacrylate (tBA-co-PEGDMA) polymers have been synthesised and characterised prior to incorporation of organoclay. Increasing the poly(ethyleneglycol) dimethacrylate (PEGDMA) content in increments of 10% increased the storage modulus from 2005 to 2250 MPa, reduced the glass transition temperature from +41 to − 26°C and reduced the intensity of the associated tan δ peak. The tBA-co-PEGDMA crosslinked networks displayed useful shape memory properties up to PEGDMA contents of 40%. Above this PEGDMA percentage the materials were prone to fracture and too brittle for a realistic assessment of their shape memory capability. The system containing 90% t-butylacrylate (tBA) and 10% PEGDMA was selected as the host matrix to investigate how the incorporation of 1 to 5 mass% of a benzyl tallow dimethylammoniumexchanged bentonite (BTDB) influenced the shape memory properties. X-ray diffraction data confirmed that BTDB formed a microcomposite in the selected matrix and exerted no influence on the storage modulus, rubbery modulus, glass transition temperature, T g , or the shape or intensity of the tan δ peak of the host matrix. Therefore, it was anticipated that the presence of BTDB would have no effect, positive or negative, nor on the shape memory properties of the host matrix. However, it was found that the incorporation of clay, especially at the 1 mass% level, significantly accelerated the speed, compared with the clay-free SMP, at which the microcomposite returned to the original, permanent shape. This accelerated return to the permanent shape was also observed when the microcomposite was coated onto a 100 μm PET film.

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“…The rubbery storage modulus increased as the PEGDMA content increased in line with work with related systems (Gall et al, 2005;Kramer et al, 2010;Ortega et al, 2008).…”

Section: Dynamic Mechanical Analysissupporting

confidence: 80%

Section: Dynamic Mechanical Analysismentioning

confidence: 87%

The effect of organoclay addition on the properties of an acrylate based, thermally activated shape memory polymer

Barwood

Breen

Clegg

et al. 2014

Applied Clay Science

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“…22 The SMP films deposited by vapor deposition techniques have the same transition temperatures as the SMP synthesized from liquid phase. 23 Conformal coating of AAO membrane with constant thickness throughout the pore can be achieved by the initiated chemical vapor deposition (iCVD) which is an adsorption limited process. iCVD is a free radical polymerization technique to produce structurally well-defined conformal polymer coatings, and therefore offers a high degree of control over the geometry and thickness of the polymer.…”

Section: Resultsmentioning

confidence: 99%

A stimuli-responsive coaxial nanofilm for burst release

2011

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“…Recent development of SMP has provided new avenues for active control of the medical devices. , SMP offers two unique mechanical characteristics: (1) a large change in the Young’s moduli by the change in temperature, and (2) shape-memory effect (SME) to recover the memorized shape. Taking advantage of these characteristics, self-expandable SMP stents have been developed, − and temperature-mediated self-folding of SMP thin films has been studied for biomedical applications. − Despite these demonstrations, however, the use of SMP to enhance the capability of injectable nanosheets has never been investigated. In this communication, for the first time, we demonstrated that the use of SMP added ideal characteristics to the nanosheets (Figure S1).…”

Section: Introductionmentioning

confidence: 99%

Syringe-Injectable, Self-Expandable, and Ultraconformable Magnetic Ultrathin Films

Yamagishi

Nojiri

Iwase

et al. 2019

ACS Appl. Mater. Interfaces

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Syringe-injectable biomaterials and medical devices are important as minimally invasive implants for diagnosis, therapy, and regenerative medicine. Free-standing polymeric nanosheets with a thickness less than 1 μm and a flexural rigidity less than 10 −2 nN m are a promising platform of syringe-injectable, implantable devices that provide conformable and long-term stable adhesion to the target biological tissues for in situ delivery of therapeutic materials. Here, we developed free-standing ultrathin films (<1 μm thick) based on polyurethane-based shape-memory polymer (SMP) and magnetic nanoparticles (MNP), termed MNP-SMP nanosheets. With the temperature-mediated shape-memory effect of SMP, we overcome the limitation in the manipulation of the conventional polymer nanosheets. In particular, we demonstrated the following four capabilities using the 710 nm thick MNP-SMP nanosheet with the glass transition temperature (T g ) of 25 °C:(1) syringe-injectability through the medical needles, (2) self-expandability after ejection, (3) conformability and removability on the biological surfaces, and (4) guidability in an external magnetic field. The MNP-SMP nanosheets were readily interfaced with an additional layer of poly(lactic-co-glycolic acid) (PLGA) to extend their functionality as a carrier of molecular and cellular drugs. The MNP-SMP nanosheets will contribute to the development of advanced syringe-injectable medical devices as a platform to deliver drugs, sensors, cells, and engineered tissues to the specific site or lesion in the body for minimally invasive diagnosis and therapy.

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Shape Memory Polymer Thin Films Deposited by Initiated Chemical Vapor Deposition

Cited by 11 publications

References 20 publications

The effect of organoclay addition on the properties of an acrylate based, thermally activated shape memory polymer

The effect of organoclay addition on the properties of an acrylate based, thermally activated shape memory polymer

A stimuli-responsive coaxial nanofilm for burst release

Syringe-Injectable, Self-Expandable, and Ultraconformable Magnetic Ultrathin Films

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