Macrothiols Through Free Radical Chain Transfer: Synthesis, Kinetics, and Application in Block Copolymer Synthesis

Nair, C. P. Reghunadhan; Sivadasan, P; Balagangadharan, V. P.

doi:10.1081/ma-100101516

Cited by 5 publications

(3 citation statements)

References 10 publications

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“…It is well known that a number of techniques for the preparation of block copolymers have been developed hitherto (1)(2)(3)(4)(5)(6). Among them, the application of sequential free radical initiator, macro-initiators or macro-coinitiators with active functional groups bound on their ends is a simple and favorable alternative to prepare block copolymer under mild conditions.…”

Section: Introductionmentioning

confidence: 99%

PMMA-containing ITX Residues and its Initiation for Synthesizing PMMA-b-PSt Copolymer

Meng

Liu

Yang

2009

Journal of Macromolecular Science, Part A

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In virtue of the reversible coupling and cleaving mechanism involved isopropylthioxanthone (ITX), a precursor of poly(methyl methacrylate) ended with ITX residues (PMMA-ITXH) was firstly synthesized through the photopolymerization of methyl methacrylate (MMA) initiated by a binary system of ITX and ethyl-p-dimethyl amino benzoate (EDAB), and secondly, applying this precursor as a macroinitiator, block copolymer of poly(methyl methacrylate) and polystyrene (PMMA-b-PSt) was produced through a thermal activated radical polymerization of styrene (St) at a temperature above 80 • C. The content of incorporation of the reduced ITX groups in the precursor was estimated by UV-vis spectrum analysis and the results indicated that it was greatly influenced by the ITX concentration in system. The presence of EDAB could promote the polymerization and result in high monomer conversions and low molecular weight of polymers with wide distributions, but had no evident effect on the incorporation of reduced ITX moieties in polymer. Furthermore, more monomer supplied in system was advantageous for the production of high molecular weight of polymers and provided apparently low content of reduced ITX residues in polymer. Using a selected precursor of PMMA-ITXH with a moderate level of reduced ITX residues, molecular weight and its distribution, the bulk polymerization of St was initiated. FTIR spectrum analysis and GPC measurement confirmed the formation of block copolymer of PMMA-b-PSt.

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Section: Introductionmentioning

confidence: 99%

PMMA-containing ITX Residues and its Initiation for Synthesizing PMMA-b-PSt Copolymer

Meng

Liu

Yang

2009

Journal of Macromolecular Science, Part A

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“…Among those, reversible addition–fragmentation chain transfer or RAFT polymerization involves chain transfer to a dithioester or trithiocarbonate-based CTA for the synthesis of well-defined block copolymers with an array of diverse functionalities . Similar macro-CTAs were also used in a free radical chain transfer process to yield block copolymers in a straightforward approach …”

mentioning

confidence: 99%

“…8 Similar macro-CTAs were also used in a free radical chain transfer process to yield block copolymers in a straightforward approach. 9 The advent of ring opening metathesis polymerization (ROMP) has allowed gaining access to functional block copolymers providing self-assembled nanostructures in sol-utions, 10 applications in biology, 11 and materials. 12,13 Defined block copolymers of mainly norbornene imide-based monomers have been synthesized using functional group tolerant Grubbs catalysts 14 (Grubbs' first generation catalyst or G1 and Grubbs' third generation catalyst or G3) via adding monomers sequentially 15,16 or a one-pot approach.…”

mentioning

confidence: 99%

Macrochain Transfer Agents for Catalytic Ring-Opening Metathesis Polymerization

Mandal

Kilbinger

2022

ACS Macro Lett.

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A monosubstituted 1,3-diene derivative attached to a polymer is demonstrated to act as a macrochain transfer agent in catalytic ring-opening metathesis polymerization. PEG-and PLA-based macrochain transfer agents were synthesized in a few steps and were characterized using NMR spectroscopy, size exclusion chromatography (SEC) and matrix-assisted laser desorption/ ionization-time-of-flight (MALDI-ToF) mass spectrometry. Poly(L-lactide) based diblock copolymer, poly(ethylene glycol)-based diblock, and triblock (ABA type) copolymers of varied chain lengths were prepared catalytically in a one-pot approach via metathesis polymerization. Block copolymers were characterized by SEC and showed monomodal molecular weight distributions. Moreover, DOSY NMR spectroscopy further proved the block microstructures of the synthesized polymers.

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Poly(methyl methacrylate)-block-polysulfide-block-poly(methyl methacrylate) copolymers obtained by free-radical polymerization combined with oxidative coupling

Teodorescu

Drăghici

2006

Polym. Bull.

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Macrothiols Through Free Radical Chain Transfer: Synthesis, Kinetics, and Application in Block Copolymer Synthesis

Cited by 5 publications

References 10 publications

PMMA-containing ITX Residues and its Initiation for Synthesizing PMMA-b-PSt Copolymer

PMMA-containing ITX Residues and its Initiation for Synthesizing PMMA-b-PSt Copolymer

Macrochain Transfer Agents for Catalytic Ring-Opening Metathesis Polymerization

Poly(methyl methacrylate)-block-polysulfide-block-poly(methyl methacrylate) copolymers obtained by free-radical polymerization combined with oxidative coupling

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