Degradation of segmented poly(etherurethane) Tecoflex® induced by electron beam irradiation: Characterization and evaluation

Guignot, C.; Betz, N.; Légendre, B.; Moël, A. Le; Yagoubi, Najet

doi:10.1016/s0168-583x(01)00850-3

Cited by 74 publications

(50 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It is confirmed by the literature that the N-H region overlaps with the region of the -OH groups [2,4,31,32]. This alteration of the FTIR spectrum indicates oxidative degradation and the formation of new hydrogen bonds [3,5,33]. During the oxidative degradation of the hard segment bond scission takes place on the urethane linkage, which indicates the broadening of the N-H region and is due to the formation of primary amines.…”

Section: In-vitro Biocompatibility Testsupporting

confidence: 61%

“…The peak is assigned to the free aromatic amine and correlated to the degradation of the hard segment [34]. Besides, in case of zeolite content higher than 3% in Gamble's solution the C-O-C asymmetric stretching of polyether (1103 and 1070 cm -1 ), urethane (1017 cm -1 ) and the asymmetric ring stretching of the cyclohexane increased significantly [3]. This gives evi- dence that oxidative degradation and bond scissions occurred in both the hard and soft segment with increased functionality of ether and aromatic groups.…”

Section: In-vitro Biocompatibility Testmentioning

confidence: 96%

“…The formation of -OH groups is a consequence of the water uptake and indicates oxidative degradation of the soft segment. The bond scission in the soft segment occurs on the methylene of the ether group by the formation of hydro-peroxide (3388 cm -1 ) [3]. In Gamble solution apart from the pure PU the -OH peak broadened and formed an overlap with the N-H region after four weeks exposure.…”

Section: In-vitro Biocompatibility Testmentioning

confidence: 99%

See 2 more Smart Citations

The influence of Ag+, Zn2+ and Cu2+ exchanged zeolite on antimicrobial and long term in vitro stability of medical grade polyether polyurethane

Kaali¹,

Pérez-Madrignal²,

Strömberg³

et al. 2011

Express Polym. Lett.

View full text Add to dashboard Cite

This study aims to investigate the limitations and applicability of different ion exchanged zeolites as antimicrobial additive in thermoplastic polyether type polyurethanes. These composites were designed to improve the health quality of hospitalized patients by expressing both biocompatibility and relevant antimicrobial activity. The zeolites were exchanged with silver, copper and zinc ions and single, binary and ternary ion-exchanged zeolite-polyurethane composites were prepared. The antimicrobial activity and the resistance of the composites against the human environment play vital role in the applicability of the materials as a medical device therefore these properties were investigated. The antimicrobial test were performed on Methicillin-resistant Staphylococcus aureus, Pseudomonas aeruginosa and Candida tropicalis. The tests showed that the efficiency of the silver ions is superior to the other single ionic systems. Besides, the binary and ternary ion-exchanged samples had similar antimicrobial efficiency regardless the type of the ions in the zeolite. The biocompatibility tests were carried out in-vitro in artificial body fluids for a period of 12 weeks. As a result of the invitro test, degradation of the composites were observed and the structural changes of the materials were detected and described by Scanning Electron Microscopy, Contact Angle measurements and Attenuated Total Reflection Fourier Transform Infrared Spectroscopy

show abstract

Section: In-vitro Biocompatibility Testsupporting

confidence: 61%

Section: In-vitro Biocompatibility Testmentioning

confidence: 96%

Section: In-vitro Biocompatibility Testmentioning

confidence: 99%

See 1 more Smart Citation

The influence of Ag+, Zn2+ and Cu2+ exchanged zeolite on antimicrobial and long term in vitro stability of medical grade polyether polyurethane

Kaali¹,

Pérez-Madrignal²,

Strömberg³

et al. 2011

Express Polym. Lett.

View full text Add to dashboard Cite

show abstract

“…Two different thermoplastic shapememory polymers were investigated as matrix material for the composites. T trans of the aliphatic polyetherurethane Tecoflex EG72D (TFX) (28,29) synthesized from methylene bis(pcyclohexyl isocyanate) (H12 MDI), 1,4-butanediol (BD), and poly(tetramethylene glycol) (PTMG) (Fig. 1a) is a glass transi-tion at 74°C.…”

Section: Resultsmentioning

confidence: 99%

Initiation of shape-memory effect by inductive heating of magnetic nanoparticles in thermoplastic polymers

Mohr

Kratz

Weigel

et al. 2006

Proc. Natl. Acad. Sci. U.S.A.

750

586

View full text Add to dashboard Cite

In shape-memory polymers, changes in shape are mostly induced by heating, and exceeding a specific switching temperature, T switch. If polymers cannot be warmed up by heat transfer using a hot liquid or gaseous medium, noncontact triggering will be required. In this article, the magnetically induced shape-memory effect of composites from magnetic nanoparticles and thermoplastic shapememory polymers is introduced. A polyetherurethane (TFX) and a biodegradable multiblock copolymer (PDC) with poly(p-dioxanone) as hard segment and poly( -caprolactone) as soft segment were investigated as matrix component. Nanoparticles consisting of an iron(III)oxide core in a silica matrix could be processed into both polymers. A homogeneous particle distribution in TFX could be shown. Compounds have suitable elastic and thermal properties for the shape-memory functionalization. Temporary shapes of TFX compounds were obtained by elongating at increased temperature and subsequent cooling under constant stress. Cold-drawing of PDC compounds at 25°C resulted in temporary fixation of the mechanical deformation by 50 -60%. The shape-memory effect of both composite systems could be induced by inductive heating in an alternating magnetic field (f ‫؍‬ 258 kHz; H ‫؍‬ 30 kA⅐m ؊1 ). The maximum temperatures achievable by inductive heating in a specific magnetic field depend on sample geometry and nanoparticle content. Shape recovery rates of composites resulting from magnetic triggering are comparable to those obtained by increasing the environmental temperature.nanocomposite ͉ shape-memory polymer ͉ stimuli-sensitive polymer S hape-memory polymers are able to recover their predefined original shape when exposed to an external stimulus. A prerequisite for the shape-memory effect is a preceding functionalization of the material to temporarily fix a mechanical deformation. Most shape-memory polymers are thermosensitive materials. The shape is actuated by exceeding a specific switching temperature, T switch (1). Thermoplastic shape-memory polymers have at least two separated phases, where the domains with the highest thermal transition (T perm ) stabilize the permanent shape by acting as physical netpoints. A second phase having another thermal transition T trans serves as switch. At temperatures above T trans the chain segments forming this phase are flexible and the material is highly elastic, whereas the flexibility of the chains below T trans is limited and enables the fixation of the temporary shape. T trans can either be a glass transition (T g ) or a melting temperature (T m ). Whereas T trans is the thermal transition of the switching segment phase, typically determined by differential scanning calorimetry (DSC), T switch is result of a thermomechanical test used to quantify the shape-memory effect.An important class of thermoplastic shape-memory polymers are polyurethanes. They often contain a hard segment from methylene bis(4-phenylisocyanate) (MDI) and 1,4-butanediol. Depending on the switching segment, T trans can be either a melting...

show abstract

“…13,14 Besides, shape memory polyurethane (SMPU) also has a wide range of applications in the biomedical field. 15,16 For example, using the shape memory effect of polyurethane based on poly(ε-caprolactone) (PCLU), Li 15 prepared fast self-expandable stents which could be used in tissue engineering. Betz reported available commercially polyetherurethanes (PEU) which is used in artificial hearts and pacemaker leads.…”

Section: ■ Introductionmentioning

confidence: 99%

Design of Triple-Shape Memory Polyurethane with Photo-cross-linking of Cinnamon Groups

Wang

Yang

Chen

et al. 2013

ACS Appl. Mater. Interfaces

103

View full text Add to dashboard Cite

A triple-shape memory polyurethane (TSMPU) with poly(ε-caprolactone) -diols (PCL-diols) as the soft segments and diphenyl methane diisocyanate (MDI), N,N-bis (2-hydroxyethyl) cinnamamide (BHECA) as the hard segments was synthesized via simple photo-crosslinking of cinnamon groups irradiated under λ > 280 nm ultraviolet (UV) light. Fourier transform infrared spectroscopy (FT-IR), proton nuclear magnetic resonance ( 1 H-NMR) and ultraviolet-visible absorption spectrum (UV−vis) confirmed the chemical structure of the material. Differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA) results demonstrated that the photocrosslinked polymer possessed two transition temperatures, one is due to the melting point of the soft segment PCL-diols, and the other is due to the glass transition temperature. All these contributed to the cross-linked structure of the hard segments and resulted in an excellent triple-shape memory effect. Alamar blue assay showed that the material has good non-cytotoxicity and can be potentially used in biomaterial devices.

show abstract

Degradation of segmented poly(etherurethane) Tecoflex® induced by electron beam irradiation: Characterization and evaluation

Cited by 74 publications

References 18 publications

The influence of Ag+, Zn2+ and Cu2+ exchanged zeolite on antimicrobial and long term in vitro stability of medical grade polyether polyurethane

The influence of Ag+, Zn2+ and Cu2+ exchanged zeolite on antimicrobial and long term in vitro stability of medical grade polyether polyurethane

Initiation of shape-memory effect by inductive heating of magnetic nanoparticles in thermoplastic polymers

Design of Triple-Shape Memory Polyurethane with Photo-cross-linking of Cinnamon Groups

Contact Info

Product

Resources

About