Polyisobutylene‐based polyurethanes X: PU nanocomposites with s‐containing soft segments

Abstract

Sulfur-containing polyisobutylene (PIB)-based polyurethane nanocomposite (PIB s -PU/NC) was synthesized using HOACH 2 CH 2 ASAPIBASACH 2 CH 2 AOH for the soft segment, conventional hard segments of MDI and BDO, and organically modified montmorillonite (OmMMT) nanolayers. The properties of PIB s -PU/NC containing 72.5% PIB and 0.5% OmMMT were studied and contrasted with unmodified PIB s -PU. PIB s -PU/ NC produces colorless optically clear films exhibiting enhanced tensile strength, elongation, oxidative-hydrolytic stability, and creep resistance relative to that of PIB s -PU. FTIR spectroscopy indicates H bonded S atoms between soft and hard segments, and OmMMT nanolayers. DSC and XRD suggest randomly dispersed low-periodicity crystals and urea groups between galleries. We propose that minute amounts of OmMMT nanolayers become covalently attached to polyurethane chains and beneficially affect properties by acting as co-chain extender/reinforcing filler.

Double Cross‐Linked Polyisobutylene‐Based Polyurethane (xPIB‐PU) I: Synthesis, Processing, and Properties

“…The synthesis, properties, and uses of PIB‐PUs have been intensively investigated in recent years. [ 1–15 ] Among the many potential applications of these materials, we explored their use in long‐term implantable (indwelling) medical devices, particularly for fully synthetic heart valve prostheses. PIB‐PU heart valves promise to be superior to current mechanical and tissue valves made of porcine or bovine cardiac tissues or various synthetic materials.…”

Synthesis of High‐Molecular‐Weight and Strength Polyisobutylene‐Based Polyurethane and Its Use for the Development of a Synthetic Heart Valve

“…To overcome this shortcoming, we carried out systematic investigations; however, we could not increase the tensile strength and elongation above ≈26 MPa and ≈500%, respectively. [ 7,9–11 ]…”

“…To overcome this shortcoming, we carried out systematic investigations; however, we could not increase the tensile strength and elongation above ≈26 MPa and ≈500%, respectively. [7,[9][10][11] An aim of this communication is to report recent research to enhance key mechanical properties of PIB-PU. By optimizing synthetic conditions, we were able to significantly increase the molecular weight (MW) of PIB-PU and, hence, its tensile strength and elongation.…”

Synthesis and characterization of hydroxyl-terminated butadiene-end-capped polyisobutylene and its use as a diol for polyurethane preparation

“…Therefore, replacement of the so segment of polyurethane with polymers, such as PIB and poly(tetramethylene oxide) (PTMO), has been attempted to enable the material's application to special environments. [20][21][22][23][24][25][26][27][28][29] Thermoplastic polyurethane ureas (TPUUs) based on PTMO and PIB segments obtained by chain extension of PIB-diamine/PTMOdiol have excellent mechanical properties compared with conventional TPUs. If TPUU-based PTMO and PIB are obtained by incorporating 10-30% PTMO diol into the so segment, the resulting ultimate tensile strength and elongation at break may be higher than that of conventional TPUs.…”