Molecular Weight Development in Free-Radical Polymerization with Polyfunctional Chain-Transfer Agents, 2. Substitution Effects

Tobita, Hidetaka

doi:10.1002/1521-3919(20010701)10:6<581::aid-mats581>3.0.co;2-c

Cited by 4 publications

(1 citation statement)

References 7 publications

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“…The equation obtained is extended to account for the substitution effects of functional groups in a P-CTA in Part 2 of this series. [17] Parameters Used…”

Section: Introductionmentioning

confidence: 99%

Molecular Weight Development in Free-Radical Polymerization with Polyfunctional Chain-Transfer Agents, 1. Equal Reactivity Model

Tobita¹,

Hayashi

2001

Macromol. Theory Simul.

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“…The equation obtained is extended to account for the substitution effects of functional groups in a P-CTA in Part 2 of this series. [17] Parameters Used…”

Section: Introductionmentioning

confidence: 99%

Molecular Weight Development in Free-Radical Polymerization with Polyfunctional Chain-Transfer Agents, 1. Equal Reactivity Model

Tobita¹,

Hayashi

2001

Macromol. Theory Simul.

Self Cite

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Synthesis of amphiphilic heteroarm star‐shaped polymer via free radical polymerization using polyfunctional chain transfer agent and its self‐assembly behavior

Shi

Yang

et al. 2012

J of Applied Polymer Sci

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Amphiphilic heteroarm star-shaped polymers have important theoretical and practical significance. In this work, amphiphilic heteroarm star-shaped polymer was synthesized by the use of polyfunctional chain transfer agent via sequential free radical polymerization in two steps. First, conventional free radical polymerization of methyl methacrylate (MMA) initiated by 2,2 0 -azobis (isobutyronitrile) (AIBN) was carried out in the presence of polyfunctional chain transfer agent, pentaerythritol-tertrakis (3-mercaptopropinate) (PETMP). At appropriate monomer conversion, about two-arm s-PMMA having two residual thiol groups at the chain center was obtained. Second, the s-PMMA obtained above was used as macro-chain-transfer agent for free radical polymerization of acrylic acid (AA). The heteroarm star-shaped polymer with the hydrophobic PMMA segment and the hydrophilic PAA segment was obtained. The successful synthesis of heteroarm star-shaped polymers, (PMMA) 2 (AA) 2 , was confirmed by 1 H-NMR and its self-assembly behavior in different solvents.

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Synthesis of azobenzene‐functionalized two‐arm, three‐arm and four‐arm telomers using polyfunctional chain transfer agents

Alam

Ogata

Nonaka

et al. 2009

Polymer International

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BACKGROUND: Star‐shaped polymers are very attractive because of their interesting properties such as reduced viscosity, good solubility, low glass transition temperature and fast response to external stimuli. The incorporation of azobenzene moieties in star‐shaped polymers could significantly widen their potential applications in various optical devices. One of the most important properties of the azobenzene chromophore is its reversible trans–cis photoisomerization induced by UV or visible light. Photoisomerization induces conformational changes in azopolymer chains, which in turn lead to macroscopic variations in chemical and physical properties of the surroundings and media. RESULTS: This study reports the synthesis of azobenzene‐functionalized two‐, three‐ and four‐arm telomers via free radical telomerization using the di‐, tri‐ and tetrafunctional chain transfer agents 1,2‐ and 1,4‐benzenedimethanethiol, trimethylolpropane‐tris(2‐mercaptoacetate) and pentaerythritol‐tetrakis(3‐mercaptopropionate), respectively, in the presence of azobisisobutyronitrile. Azotelomers were characterized using gel permeation chromatography and 1H NMR and Fourier transform infrared spectroscopy. Thermal phase transition behaviors were investigated using differential scanning calorimetry and polarized optical microscopy. Azotelomers synthesized in this study showed reversible photoisomerization and a fast generation of birefringence. CONCLUSION: Considering the photoisomerization behavior and birefringence of the two‐, three‐ and four‐arm azotelomers, it can be concluded that they could be potential candidates for use in various optical devices. Copyright © 2009 Society of Chemical Industry

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Molecular Weight Development in Free-Radical Polymerization with Polyfunctional Chain-Transfer Agents, 2. Substitution Effects

Cited by 4 publications

References 7 publications

Molecular Weight Development in Free-Radical Polymerization with Polyfunctional Chain-Transfer Agents, 1. Equal Reactivity Model

Molecular Weight Development in Free-Radical Polymerization with Polyfunctional Chain-Transfer Agents, 1. Equal Reactivity Model

Synthesis of amphiphilic heteroarm star‐shaped polymer via free radical polymerization using polyfunctional chain transfer agent and its self‐assembly behavior

Synthesis of azobenzene‐functionalized two‐arm, three‐arm and four‐arm telomers using polyfunctional chain transfer agents

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