Stability of cis-1,4-Polyisoprene and Its Vulcanizates in Aqueous and Biologically Active Media

Khodzhaeva, I. D.; Kislinovskaja, N. V.; Smurova, E. V.

doi:10.1080/00914039408028582

Cited by 3 publications

(3 citation statements)

References 4 publications

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“…Among the family of synthetic polymers, polyisoprene is currently receiving special attention for its use in a wide range of applications in the rubber industry, e.g., tire manufacturing, medical devices and others [9,10,11,12,13]. The coordination-insertion polymerization of isoprene produces four types of unit distributions such as cis -1,4, trans -1,4, 3,4 and 1,2-vinyl arrangements (Figure 1), the amount and type of sequences dictating the resulting thermal, mechanical and physical properties of the polymer.…”

Section: Introductionmentioning

confidence: 99%

Highly Active Iminopyridyl Iron-Based Catalysts for the Polymerization of Isoprene

2019

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A series of iminopyridyl-based ligands, 6-[(Ar)N=C(R)]-2-C6H5N [(Ar = 2,6-Me2-C6H3, R = Me (L1); Ar = 2,6-iPr2-C6H3, R = Me (L2); Ar = 2,6-Me2-C6H3, R = H (L3); Ar = 2,6-iPr2-C6H3, R = H (L4); Ar = 3,5-(CF3)2-C6H3, R = Me (L5); Ar = C6F5, R = Me (L6)], and their corresponding iron (II) complexes were developed to investigate their application in the controlled coordinative polymerization of isoprene. The modulation of steric and electronic properties within this family of ligands/pre-catalysts has shown to influence the stereo-selectivity and activity of the polymerization of isoprene after activation. Upon activation with various co-catalysts such as AliBu3/[Ph3C][B(C6F5)4], AlEt3/[Ph3C][B(C6F5)4] or MAO, the resulting catalysts produced polyisoprenes with an excellent conversion (>99% of 500–5000 equiv.) within less than 1 h (TOF > 500 h−1) and having a variety of stereo-/regio-regularities. The presence of electron-donating and withdrawing groups drastically impacted the activity and the stereoselectivity of the catalysts during the course of the polymerization of isoprene. When activated with AliBu3/[Ph3C][B(C6F5)4], the complexes {6-[(2,6-Me2-C6H3)N=C(Me)]-2-C6H5N}FeCl2 (C1) and {6-[(2,6-iPr2-C6H3)N=C(Me)]-2-C6H5N}FeCl2 (C2) exhibited moderate trans-1,4 selectivity (>67%) while the iron-based systems bearing related aldiminopyridyl ligands {6-[(2,6-Me2-C6H3)N=C(H)]-2-C6H5N}FeCl2 (C3) and {6-[(2,6-iPr2-C6H3)N=C(H)]-2-C6H5N}FeCl2 (C4) were found to afford significant cis-1,4 selectivity at low temperature (>86% at −40 °C). On the other hand, the ternary {6-[(3,5-(CF3)2-C6H3)N=C(Me)]-2-C6H5N}FeCl2 (C5) or {6-[(C6F5)N=C(Me)]-2-C6H5N}FeCl2 (C6)/AliBu3/[Ph3C][B(C6F5)4] catalytic combinations showed exceptional activity for the polymerization of isoprene (TOF > 1,000,000 h−1), albeit providing less stereoselectivity.

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Section: Introductionmentioning

confidence: 99%

Highly Active Iminopyridyl Iron-Based Catalysts for the Polymerization of Isoprene

2019

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“…Polyisoprene was chosen for its biocompatibility [30] and its gas-barrier properties. [31] In addition, polyisoprenes hows excellent adhesion to metal surfaces.…”

Section: Resultsmentioning

confidence: 99%

“…The fourth and last step consists in the polymerization of isoprene in a confined environment. Polyisoprene was chosen for its biocompatibility30 and its gas‐barrier properties 31. In addition, polyisoprene shows excellent adhesion to metal surfaces 32.…”

Section: Resultsmentioning

confidence: 99%

Isoprene Polymerization on Iron Nanoparticles Confined in Carbon Nanotubes

Zhang

Tan

et al. 2015

Chemistry A European J

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The confinement of air-protected metallic magnetic nanoparticles in the inner cavity of carbon nanotubes (CNTs) should offer an interesting perspective for biomedical applications or for controlling CNT alignment in composites. Because the direct confinement of polymer-precoated nanoparticles in CNTs could be restricted by diffusion limitations, we developed a process based on: 1) the confinement of iron nanoparticles surface-modified with an iron polymerization catalyst in the cavity of CNTs and 2) the polymerization of isoprene on the confined nanoparticles. The resulting material consists in CNT-confined iron nanoparticles coated with a polyisoprene air barrier. This approach constitutes a proof of concept for the development of smart materials for use in medicine or composites.

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Elastomers for biomedical applications

Yoda¹

1998

Journal of Biomaterials Science, Polymer Edition

192

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Current topics in elastomers for biomedical applications are reviewed. Elastomeric biomaterials, such as silicones, thermoplastic elastomers, polyolefin and polydiene elastomers, poly(vinyl chloride), natural rubber, heparinized polymers, hydrogels, polypeptides elastomers and others are described. In addition biomedical applications, such as cardiovascular devices, prosthetic devices, general medical care products, transdermal therapeutic systems, orthodontics, and ophthalmology are reviewed as well. Elastomers will find increasing use in medical products, offering biocompatibility, durability, design flexibility, and favorable performance/cost ratios. Elastomers will play a key role in medical technology of the future.

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Stability of cis-1,4-Polyisoprene and Its Vulcanizates in Aqueous and Biologically Active Media

Cited by 3 publications

References 4 publications

Highly Active Iminopyridyl Iron-Based Catalysts for the Polymerization of Isoprene

Highly Active Iminopyridyl Iron-Based Catalysts for the Polymerization of Isoprene

Isoprene Polymerization on Iron Nanoparticles Confined in Carbon Nanotubes

Elastomers for biomedical applications

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