Polyphosphazenes

Allcock, Harry R.

doi:10.1002/9781119951438.eibc0186

Cited by 2 publications

(3 citation statements)

References 33 publications

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“…31 P NMR spectra were proton decoupled. (Allcock, 1992) H shifts are reported in ppm relative to tetramethylsilane at 0 ppm, and 31 P shifts are reported in ppm relative to 85% H 3 PO 4 at 0 ppm. Attenuated total reflection Fourier transform infrared (ATR‐FTIR) spectra were measured with an FTIR Bruker V70 spectrometer using polymer films directly.…”

Section: Methodsmentioning

confidence: 99%

“…Polyphosphazenes are hybrid high‐molecular‐weight polymers with a linear backbone of alternating phosphorous and nitrogen atoms with two organic or inorganic side groups attached to each phosphorus atom (Allcock, 1992). By varying the side groups linked to the polyphosphazene backbone in single‐substituent or mixed‐substituent derivatives with two or more different substituents, several hundred polyphosphazene polymers with a wide range of properties have been synthesized and have many potential applications in a variety of fields.…”

Section: Introductionmentioning

confidence: 99%

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New cross‐linkable poly[bis(octafluoropentoxy) phosphazene] biomaterials: Synthesis, surface characterization, bacterial adhesion, and plasma coagulation responses

Chen

Zhu

et al. 2020

J Biomed Mater Res

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Biomaterial-associated microbial infection and thrombosis represent major issues to the success of long-term use of implantable blood-contacting medical devices. The development of new poly[bis(octafluoropentoxy) phosphazene (OFP) biomaterials provides new routes for combatting microbial infection and thrombosis. However, the limited mechanical properties of OFP to date render them unsuitable for application in medical devices and inhibit any attempts at subsequent surface topography modification. In this study, we synthesized cross-linkable OFPs (X-OFPs) with the different degrees of cross-linking in an effort to improve the mechanical properties. The results showed that the surface chemistry and surface topography of X-OFPs do not change significantly, but the surface mechanical stiffness increased after crosslinking. Atomic force microscopic phase images showed that the polymer phase separation structures changed due to cross-linking. Experiments with three bacterial strains: Staphylococcal epidermidis, Staphylococcal aureus, and Pseudomonas aeruginosa showed that bacterial adhesion was significantly decreased on the OFP and X-OFPs for both the pre-cross-linked and cross-linked as compared to polyurethane biomaterials. Furthermore, bacterial adhesions were lower on X-OFP surfaces than on precross-linked materials, suggesting that mechanical stiffness is an important parameter influencing bacterial adhesion. Blood plasma coagulation responses revealed longer coagulation times for OFP and X-OFP materials than on polyurethanes, indicating that the new cross-linked OFPs are resistant to plasma coagulation compared to currently used polyurethane biomaterials.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

New cross‐linkable poly[bis(octafluoropentoxy) phosphazene] biomaterials: Synthesis, surface characterization, bacterial adhesion, and plasma coagulation responses

Chen

Zhu

et al. 2020

J Biomed Mater Res

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“…Complexes of polymers with single-walled carbon nanotubes (SWNTs) are of growing interest for their role in hybrid materials including stretchable electronics. − Polyphosphazenes have special properties that arise from their unsaturated inorganic backbone and the wide range of different side group that can be linked to the polymer chain. Since the first reports of stable and soluble polyphosphazenes in the 1960s this field has expanded dramatically. − Actual and potential applications of polyphosphazenes have been found in numerous areas, such as elastomeric materials, − optoelectronic polymers, − and biomaterials. − Recently, we reported that chemical or physical cross-linking techniques significantly enhance the elastomeric characteristics of these materials − This is a useful feature for aerospace, automotive, arctic, and oil drilling engineering and also for the development of stretchable electronic applications. Thus, achieving a combination of the properties of polyphosphazenes with SWNTs is an appealing prospect.…”

Section: Introductionmentioning

confidence: 99%

Molecular Engineering of Polyphosphazenes and SWNT Hybrids with Potential Applications as Electronic Materials

Ren

Allcock

2018

Macromolecules

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Polymer/single-walled carbon nanotube (SWNT) hybrids are promising candidates in applications such as flexible and stretchable electronics. In this contribution, we have examined structure–property relationships for constructing new polyphosphazene–SWNT hybrids. UV–vis and Raman spectroscopy studies revealed that the unique PN backbone enables strong intermolecular donor–acceptor interactions between the polymer and SNWTs. Furthermore, the polymeric backbone and the environment at the P-centers collectively play important roles in the formation of the hybrids. For polymers with shorter alkoxy substituents, the donor–acceptor interactions between the PN backbone and SWNTs play a crucial role in stabilizing the hybrid complexes, but for polymers with longer alkoxy substituents, the CH−π interactions and steric hindrance between the alkyl side chains and SWNTs counterbalance each other and control the stability of the hybrid complexes. Furthermore, the presence of fluorine and oxygen atoms is detrimental to the stability of the hybrid complexes. New cross-linkable polyphosphazenes with anthracene side units were also synthesized. When photo-cross-linked, these polyphosphazene/SWNT hybrids showed elastomeric characteristics and electronic properties that are promising for future applications.

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Polyphosphazenes

Cited by 2 publications

References 33 publications

New cross‐linkable poly[bis(octafluoropentoxy) phosphazene] biomaterials: Synthesis, surface characterization, bacterial adhesion, and plasma coagulation responses

New cross‐linkable poly[bis(octafluoropentoxy) phosphazene] biomaterials: Synthesis, surface characterization, bacterial adhesion, and plasma coagulation responses

Molecular Engineering of Polyphosphazenes and SWNT Hybrids with Potential Applications as Electronic Materials

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