Living Cationic Sequential Block Copolymerization of Isobutylene with 4‐tert‐Butoxystyrene: Synthesis and Characterization of Poly(p‐hydroxystyrene‐<i>b</i>‐isobutylene‐<i>b</i>‐p‐hydroxystyrene) Triblock Copolymers

Bouchékif, Hassen; Som, Abhijit; Sipos, László; Faust, Rudolf

doi:10.1080/10601320601187986

Cited by 11 publications

(5 citation statements)

References 16 publications

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“…[17] Those pendant double bonds (C=C) of the polymer chains can serve as reactive point to undergo various chemical reactions, such as grafting copolymerization. [18,19] Isobutylene (IB) homopolymers and its copolymers, including styrene (St) [20][21][22][23] α-methylstyrene, [24,25] phydroxystyrene, [26] p-butylstyrene, [27] indene, [28] alkyl methacrylate [29] and ethylene, [30] have obtained lots of attention in research and industries, due to their excellent chemical resistance, low permeability to gases and high elasticity. However, these copolymers have strict synthesis process (T polymerization ≈ À100 C) and relatively low glass-transition temperature of hard polymer blocks (T g ≈ 100 C-200 C), which restricts its application in high temperature.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of syndiotactic polystyrene—Polyisobutylene graft copolymers by cationic half‐sandwich scandium complex

Wang

Zhou

et al. 2022

Polymer Engineering & Sci

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Syndiotactic polystyrene is a high strength engineering plastic, and polyisobutylene is an excellent elastomers. In order to combine the advantages of syndiotactic polystyrene and polyisobutylene, isobutylene was achieved to graft onto the crystalline syndiotactic polystyrene, forming graft copolymers, under half sandwich scandium complex [(C 5 Me 4 SiMe 3 )Sc(CH 2 SiMe 3 ) 2 THF]/[Ph 3 C] [B(C 6 F 5 ) 4 ] after the application of syndiotactic copolymers of styrene and 4-isopropenylstyrene with pendant double bonds. Grafted copolymers based on crystalline polystyrene and rubbery polyisobutylene block have both high T m (270 C) and low T g (À67 C), meanwhile, these materials have relative good mechanical properties.

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Section: Introductionmentioning

confidence: 99%

Synthesis of syndiotactic polystyrene—Polyisobutylene graft copolymers by cationic half‐sandwich scandium complex

Wang

Zhou

et al. 2022

Polymer Engineering & Sci

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“…By far, the simplest and most common way to produce a processable thermoplastic elastomer is through the formation of physical cross-links in an ABA triblock copolymer. − In such systems, a phase-segregated morphology provides the basis for elastomeric behavior; the rigid glassy or semicrystalline hard A block domains anchor a continuous flexible amorphous soft B domain, which is generally above its glass transition temperature ( T g ) at use conditions. − In addition to the combination of hard and soft blocks, the interaction parameter (χ) of the two blocks must be sufficiently high to avoid phase mixing, and the volume ratio of A to B must be such that A forms spheres in a matrix of B. , …”

Section: Introductionmentioning

confidence: 99%

Synthesis of a New, Low-T_g Siloxane Thermoplastic Elastomer with a Functionalizable Backbone and Its Use as a Rapid, Room Temperature Photoactuator

et al. 2013

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A new, low-T g siloxane thermoplastic elastomer with a functionalizable backbone was synthesized via sequential anionic polymerization and coupling, and its utility as a platform to produce functional elastomers was demonstrated by the attachment of a photoresponsive liquid crystal to produce a rapid, room temperature photoactuator. Polystyrene was used as a hard glassy end block, and poly(vinylmethylsiloxane) served as the soft middle segment in a polystyrene-b-poly(vinylmethylsiloxane)-b-polystyrene ABA triblock copolymer. The vinyl side chain was used to attach a side-on oriented mesogen to the siloxane backbone, and the resulting liquid crystal triblock copolymer was characterized with reversible photocontraction tests, where it was shown to be both elastomeric and rapidly photoresponsive at room temperature. Rather than simply undergoing a bending mechanism, an oriented thin cast film of the elastomer was observed to contract reversibly at a tensile strain of 3.3% against 25.7 kPa of applied stress in ∼5.9 s. This strategy to produce functional liquid crystal elastomers is based on the formation of spherical block copolymers with a low temperature T g for the soft domain, in contrast to cross-linked elastomers. Because the approach is simple, robust, and applicable to a wide variety of functional moieties, the resulting materials are thermoplastics that can be processed to achieve preferential orientation using standard methods, thus enhancing the capability to produce and utilize functional actuators.

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“…Polyisobutylene (PIB) is a unique, fully saturated, extremely hydrophobic and chemically stable polymer with good biocompatibility. The low glass transition temperature (T g ) of PIB makes it useful as a component of thermoplastic elastomers in linear as well as in branched forms 11–19. Due to these special properties, several attempts have been reported on the synthesis of highly branched polyisobutylenes so far 12–16, 20–33.…”

Section: Introductionmentioning

confidence: 99%

Star and Hyperbranched Polyisobutylenes via Terminally Reactive Polyisobutylene‐Polystyrene Block Copolymers

Kali

Szesztay

Bodor

et al. 2013

Macromolecular Symposia

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Summary: Unique, highly branched polyisobutylenes (PIB) were prepared via quasiliving carbocationic copolymerization of isobutylene and styrene (St) monomers. The junction points were formed by Friedel-Crafts self alkylation of PSt segments by the carbocationic chain ends. First, linear PIB was prepared with reactive chain ends. This was reacted with St monomer to form PIB-b-PSt AB, and PSt-b-PIB-b-PSt ABA type triblock copolymers with reactive carbocationic chain ends. The terminal carbonations react with the phenyl group of the polystyrene end-segments of the block copolymers leading to chain coupling, and thus PIB star polymers in the case of AB and hyperbranched PIB from ABA block copolymers. The resulting branched polymers were characterized and the branch formation was confirmed by gel permeation chromatography (GPC) and proton nuclear magnetic resonance spectroscopy ( 1 H NMR).

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Living Cationic Sequential Block Copolymerization of Isobutylene with 4‐tert‐Butoxystyrene: Synthesis and Characterization of Poly(p‐hydroxystyrene‐b‐isobutylene‐b‐p‐hydroxystyrene) Triblock Copolymers

Cited by 11 publications

References 16 publications

Synthesis of syndiotactic polystyrene—Polyisobutylene graft copolymers by cationic half‐sandwich scandium complex

Synthesis of syndiotactic polystyrene—Polyisobutylene graft copolymers by cationic half‐sandwich scandium complex

Synthesis of a New, Low-T_g Siloxane Thermoplastic Elastomer with a Functionalizable Backbone and Its Use as a Rapid, Room Temperature Photoactuator

Star and Hyperbranched Polyisobutylenes via Terminally Reactive Polyisobutylene‐Polystyrene Block Copolymers

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Living Cationic Sequential Block Copolymerization of Isobutylene with 4‐tert‐Butoxystyrene: Synthesis and Characterization of Poly(p‐hydroxystyrene‐b‐isobutylene‐b‐p‐hydroxystyrene) Triblock Copolymers

Cited by 11 publications

References 16 publications

Synthesis of syndiotactic polystyrene—Polyisobutylene graft copolymers by cationic half‐sandwich scandium complex

Synthesis of syndiotactic polystyrene—Polyisobutylene graft copolymers by cationic half‐sandwich scandium complex

Synthesis of a New, Low-Tg Siloxane Thermoplastic Elastomer with a Functionalizable Backbone and Its Use as a Rapid, Room Temperature Photoactuator

Star and Hyperbranched Polyisobutylenes via Terminally Reactive Polyisobutylene‐Polystyrene Block Copolymers

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Synthesis of a New, Low-T_g Siloxane Thermoplastic Elastomer with a Functionalizable Backbone and Its Use as a Rapid, Room Temperature Photoactuator