Synthesis, characterization, and glass transition temperature of poly(styrene‐<i>b</i>‐butyl methacrylate) block copolymers by stable free radical polymerization

Cuervo-Rodríguez, Rocío; Madruga, Enrique López

doi:10.1002/app.1818

Cited by 6 publications

(1 citation statement)

References 25 publications

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“…In these cases, two glass transitions were detected by DSC, which confirmed that phase separation had taken place. This effect of the increase in the macroinitiator concentration is in accordance with earlier findings by Fernandez‐Garcia et al40 from studies on poly( tert ‐butyl acrylate‐ g ‐styrene) copolymers. The higher macroinitiator concentration shifted the weak crystallization peaks ( T c ) toward much lower temperatures (from +2 to −12 °C) in comparison with T c of the synthesized copolymer (M/I = 300) and T c of the corresponding homopolymer in the bulk state.…”

Section: Resultssupporting

confidence: 92%

Synthesis and characterization of amphiphilic triblock copolymers by iron‐mediated atom transfer radical polymerization

Ibrahim

Starck

Löfgren

et al. 2005

J. Polym. Sci. A Polym. Chem.

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The atom transfer radical polymerization of methyl methacrylate (MMA) and n-butyl methacrylate (n-BMA) was initiated by a poly(ethylene oxide) chloro telechelic macroinitiator synthesized by esterification of poly(ethylene oxide) (PEO) with 2-chloro propionyl chloride. The polymerization, carried out in bulk at 90 8C and catalyzed by iron(II) chloride tetrahydrate in the presence of triphenylphosphine ligand (FeCl 2 Á 4H 2 O/PPh 3 ), led to A-B-A amphiphilic triblock copolymers with MMA or n-BMA as the A block and PEO as the B block. A kinetic study showed that the polymerization was first-order with respect to the monomer concentration. Moreover, the experimental molecular weights of the block copolymers increased linearly with the monomer conversion, and the molecular weight distribution was acceptably narrow at the end of the reaction. These block copolymers turned out to be water-soluble through the adjustment of the content of PEO blocks (PEO content >90% by mass). When the PEO content was small [monomer/macroinitiator molar ratio (M/I) ¼ 300], the block copolymers were water-insoluble and showed only one glass-transition temperature. With an increase in the concentration of PEO (M/I ¼ 100 or 50) in the copolymer, two glass transitions were detected, indicating phase separation. The macroinitiator and the corresponding triblock copolymers were characterized with Fourier transform infrared, proton nuclear magnetic resonance, size exclusion chromatography analysis, dynamic mechanical analysis, and differential scanning calorimetry. V V C 2005 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 43: [5049][5050][5051][5052][5053][5054][5055][5056][5057][5058][5059][5060][5061] 2005

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Section: Resultssupporting

confidence: 92%

Synthesis and characterization of amphiphilic triblock copolymers by iron‐mediated atom transfer radical polymerization

Ibrahim

Starck

Löfgren

et al. 2005

J. Polym. Sci. A Polym. Chem.

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Accelerated hygrothermal aging of Talc/Cycloaliphatic epoxy composites

et al. 2018

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Cycloaliphatic epoxy (CE) systems are resistant to many aging mechanisms, which make them useful in applications with harsh environments. Reinforcement has been used in epoxy systems to decrease water absorption and improve aging resistance; thus, it is expected that talc would benefit CE systems in a similar manner. Neat, 10, and 20 wt% talc/CE composites were aged at 50 °C and 100% relative humidity for up to 398 hr. Three‐point bend testing and dynamic mechanical analysis were performed on the aged and unaged samples. Talc reduced the amount of water absorbed in the composites significantly, and increased the composite flexural stiffness at all aging levels. Talc does not appear to mitigate the negative effects of aging on flexural strength or glass transition temperature (Tg). POLYM. COMPOS., 40:2946–2953, 2019. © 2018 Society of Plastics Engineers

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Diblock copolymers based on allyl methacrylate: Synthesis, characterization, and chemical modification

París¹,

Fuente²

2007

J. Polym. Sci. A Polym. Chem.

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Different diblock copolymers constituted by one segment of a monomer supporting a reactive functional group, like allyl methacrylate (AMA), were synthesized by atom transfer radical polymerization (ATRP). Bromo‐terminated polymers, like polystyrene (PS), poly(methyl methacrylate) (PMMA), and poly(butyl acrylate) (PBA) were employed as macroinitiators to form the other blocks. Copolymerizations were carried out using copper chloride with N,N,N′,N″,N″‐pentamethyldiethylenetriamine (PMDETA) as the catalyst system in benzonitrile solution at 70 °C. At the early stage, the ATRP copolymerizations yielded well‐defined linear block copolymers. However, with the polymerization progress a change in the macromolecular architecture takes place due to the secondary reactions caused by the allylic groups, passing to a branched and/or star‐shaped structure until finally yielding gel at monomer conversion around 40% or higher. The block copolymers were characterized by means of size exclusion chromatography (SEC), 1H NMR spectroscopy, and differential scanning calorimetry (DSC). In addition, one of these copolymers, specifically P(BA‐b‐AMA), was satisfactorily modified through osmylation reaction to obtain the subsequent amphiphilic diblock copolymer of P(BA‐b‐DHPMA), where DHPMA is 2,3‐dihydroxypropyl methacrylate; demonstrating the feasibility of side‐chain modification of the functional obtained copolymers. © 2007 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 45: 3538–3549, 2007

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Synthesis, characterization, and glass transition temperature of poly(styrene‐b‐butyl methacrylate) block copolymers by stable free radical polymerization

Cited by 6 publications

References 25 publications

Synthesis and characterization of amphiphilic triblock copolymers by iron‐mediated atom transfer radical polymerization

Synthesis and characterization of amphiphilic triblock copolymers by iron‐mediated atom transfer radical polymerization

Accelerated hygrothermal aging of Talc/Cycloaliphatic epoxy composites

Diblock copolymers based on allyl methacrylate: Synthesis, characterization, and chemical modification

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