Preparing a functionalized thermoplastic elastomer?bromination and synthesis of poly(p-methylstyrene-co-styrene)-block-poly(ethylene-co-butene)-block-poly(p-methylstyrene-co-styrene)

Tsai, Chia-Cheng; Huang, Chih-Ping; Tsiang, Raymond Chien‐Chao

doi:10.1002/(sici)1099-0518(19991115)37:22<4108::aid-pola9>3.0.co;2-2

Cited by 2 publications

(3 citation statements)

References 12 publications

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“…These polymers were reacted with substoichiometric amounts of Br 2 to yield partially bromomethylated polymers with 5, 10, 15, or 18% of the −CH 3 groups converted to −CH 2 Br (Scheme ). The bromination was found to exclusively occur at the p -CH 3 units, while the polymer backbone and the aromatic ring remain unchanged, as has previously been observed by Tsiang et al for the bromination of a copolymer of methylstyrene, styrene, butene, and ethene …”

Section: Resultssupporting

confidence: 78%

Nanofiltration for Homogeneous Catalysis Separation: Soluble Polymer-Supported Palladium Catalysts for Heck, Sonogashira, and Suzuki Coupling of Aryl Halides

2003

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The anionic polymerization of 4-methylstyrene results in a linear poly(4-methylstyrene), whose substoichiometric bromination with Br 2 converts a portion of 5-18% of the -CH 3 units into -CH 2 Br groups, which were then reacted with (1-Ad) 2 PH to synthesize a polymer loaded with sterically demanding and electron-rich -CH 2 P(1-Ad) 2 groups as the respective air-stable phosphonium salt. Palladium complexes with the phosphinated polymer are efficient catalysts for carbon-carbon coupling reactions of the Sonogashira, Suzuki, and Heck type with aryl chlorides and bromides. The molecular weight of the respective phosphines in the range of 5-35 kDa does not have a significant effect on the catalytic performance. Such polymer-enlarged catalysts are suitable for separation over a solventresistant nanofiltration membrane composed of a dense poly(dimethylsiloxane) (PDMS) layer cast on a porous sublayer of poly(acrylonitrile) (PAN). The membrane displays virtually quantitative retention of the polymeric catalyst; furthermore palladium could not be found in the permeate; TXRF and spectrophotometric determinations are indicative of >99.95% retention of the catalyst. The activity of the catalyst retained in the retentate is almost unchanged, as shown by the high (typically >90%) and almost constant yields of the coupling reactions as well as by the constant turnover frequencies of the catalysts following the membrane separation experiments during up to nine cycles of Sonogashira and Suzuki reactions. For the Heck coupling the used polar aprotic solvents best suited for the catalytic reaction lead to rapid deterioration of the membranes tested.

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Section: Resultssupporting

confidence: 78%

Nanofiltration for Homogeneous Catalysis Separation: Soluble Polymer-Supported Palladium Catalysts for Heck, Sonogashira, and Suzuki Coupling of Aryl Halides

2003

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“…It is generally carried out using Zeigler-Natta catalysts such as nickel salts and triethylaluminium. [48][49][50] The process requires very high temperature and pressure. Cobaltocene/ n-BuLi catalyst system is also helpful in the complete hydrogenation of SBS.…”

Section: Advancements In Synthesis Routesmentioning

confidence: 99%

“…SEBS is commercially manufactured via a two‐stage process by hydrogenation of SBS. It is generally carried out using Zeigler‐Natta catalysts such as nickel salts and triethylaluminium 48‐50 . The process requires very high temperature and pressure.…”

Section: Advancements In Synthesis Routesmentioning

confidence: 99%

Styrenic block copolymer‐based thermoplastic elastomers in smart applications: Advances in synthesis, microstructure, and structure–property relationships—A review

Maji

Naskar

2022

J of Applied Polymer Sci

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Styrenic block copolymers (SBC) have been gaining attention as a specialty material in elastomer and composite industries over an extended period. Its unique segmental architecture, controllable mechanical strength, ease of processing, oxidative, and environmental stability enable versatile applications. SBCs with other unique features like ion‐containing blocks, vascular compatibility, and biostability are gaining popularity in several new‐age applications. The review mainly displays the new synthetic strategies for SBC having superior thermal and environmental resistance and how their morphologies get affected by the invention of different synthesis and molecular designing technologies. It elaborates prospects and future of SBCs in other innovative application fields like sensors for wearable devices, next‐generation proton exchange membranes for fuel cells, portable power sources for electric vehicles, shape memory polymers, and so forth. Its potential in biomedical applications like heart valves, urinary tract devices, coating for coronary stents, implants, and drug delivery applications has also been discussed. It also analyses structure properties relationship which affects their performance in these fields, along with a brief introduction about the history of invention.

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Preparing a functionalized thermoplastic elastomer?bromination and synthesis of poly(p-methylstyrene-co-styrene)-block-poly(ethylene-co-butene)-block-poly(p-methylstyrene-co-styrene)

Cited by 2 publications

References 12 publications

Nanofiltration for Homogeneous Catalysis Separation: Soluble Polymer-Supported Palladium Catalysts for Heck, Sonogashira, and Suzuki Coupling of Aryl Halides

Nanofiltration for Homogeneous Catalysis Separation: Soluble Polymer-Supported Palladium Catalysts for Heck, Sonogashira, and Suzuki Coupling of Aryl Halides

Styrenic block copolymer‐based thermoplastic elastomers in smart applications: Advances in synthesis, microstructure, and structure–property relationships—A review

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