Viscoelastic and self-healing behavior of silica filled ionically modified poly(isobutylene-co-isoprene) rubber

Abstract

A self-healing rubber/silica composite with superior mechanical performance was obtained by tuning specific noncovalent filler–matrix interactions.

Hierarchical Sticker and Sticky Chain Dynamics in Self-Healing Butyl Rubber Ionomers

“…The ionic aggregation features a hierarchy of structures formed: starting from the association of two contact ion pairs to ionic multiplets, we have further aggregation into larger phase-separated regions, called ionic clusters, which also comprise immobilized polymer chains with their own glass-transition temperature ( T g ). − The final morphology depends on various factors such as polarity of the polymer matrix, its flexibility, T g , nature and size of pendant ions and their counterions, distribution of ions along the polymer backbone, ion content, presence of moisture residues, thermal history, etc. ,− As a result, the properties of ionomers can be adapted by variation of the above parameters. The objects of the present investigation are bromobutyl rubbers (brominated isobutylene–isoprene rubber, BIIR) modified with alkylimidazolium (AI) moieties exhibiting favorable self-healing capacity, as reported very recently. ,, Importantly, their association lifetime (henceforth referred to as sticker lifetime, τ st * ) and thus the material properties can be tuned by variation of the alkyl side chain of the imidazole unit . This provides the basis of a systematic study presented herein, allowing for qualitatively new insights.…”

“…The objects of the present investigation are bromobutyl rubbers (bromi-nated isobutylene−isoprene rubber, BIIR) modified with alkylimidazolium (AI) moieties 16 exhibiting favorable selfhealing capacity, as reported very recently. 3,4,17 Importantly, their association lifetime (henceforth referred to as sticker lifetime, τ st *) and thus the material properties can be tuned by variation of the alkyl side chain of the imidazole unit. 4 This provides the basis of a systematic study presented herein, allowing for qualitatively new insights.…”

Functionalized Elastomeric Ionomers Used as Effective Toughening Agents for Poly(lactic acid): Enhancement in Interfacial Adhesion and Mechanical Performance

“…For the commercially available metal cation ionomers, the limited variable molecular diversity and functional multiplicity are major shortcomings for their widespread applications in polymer blending. We recently developed a series of interesting imidazolium-based polymerized ionic liquids (PILs) with attractive properties by using tunable organic cation structures. − The diverse designability of the organic imidazolium group endows the imidazolium-based PILs with a unique self-healing performance and balanced stiffness–toughness properties. − The excellent physical performance of these PILs also inspired us to introduce the organic imidazolium group into commercial polymers such as polyolefin and elastomers to develop novel ionomers as effective modifying agents for polymer blends. , …”

Shape memory and self‐healing behavior of styrene–butadiene–styrene/ethylene‐methacrylic acid copolymer (SBS/EMAA) elastomers containing ionic interactions

“…Non‐metallic cations can also be introduced to rubber matrix to form ionic crosslinks. When some nitrogen‐containing compounds, such as alkylimidazoles, 4‐ethyl‐4‐methyl morpholinium methylcarbonate, and 2‐(dimethyl amino)‐ethyl methacrylate were introduced into poly(isobutylene‐co‐isoprene) rubber or acrylate rubber, excellent mechanical and self‐healing performance were obtained, for example, a healed tensile strength of 10.7 MPa (healing efficiency of 74%) and a elongation at break of 1040% (healing efficiency of 98%) . In addition to forming an ionic crosslinking network, metal ions can also be utilized to form supramolecular networks through metal–ligand interactions in rubber matrix.…”