A novel HEMA-derived monomer and copolymers containing side-chain thiophene units: Synthesis, characterization and thermal degradation kinetics

Çekingen, Sinem Kadriye; Saltan, Fehmi; Yıldırım, Yeliz; Akat, Hakan

doi:10.1016/j.tca.2012.07.027

Cited by 13 publications

(13 citation statements)

References 44 publications

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“…PCL homopolymer presented an average activation energy value of ∼159 KJ mol −1 ,which is similar to values reported in the literature . Rázga & Petránek and Çekingen et al reported values of activation energy for the degradation process of PHEMA homopolymer of ∼129 KJ mol −1 . In this sense, “comb‐like” copolymers with shorter branches (COP1, COP2, and COP3) exhibited similar E values than linear PCL.…”

Section: Resultssupporting

confidence: 81%

“…[2,45] R azga & Petr anek and Çekingen et al reported values of activation energy for the degradation process of PHEMA homopolymer of $129 KJ mol À1 . [46,47] In this sense, "comb-like" copolymers with shorter branches (COP1, COP2, and COP3) exhibited similar E values than linear PCL. However, a reduction in E values was observed for COP4 and COP5 that could be associated to a higher presence of HEMA in the PCL backbone (Table 1).…”

Section: Resultsmentioning

confidence: 98%

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Thermal Characterization of “Comb‐Like” Block Copolymers Based on PCL Obtained by Combining ROP and RAFT Polymerizations

Ninago

Ciolino

Villar

et al. 2016

Macromolecular Symposia

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Summary In this work we report the synthesis of poly(hydroxyethyl‐methacrylate‐graft‐polycaprolactone)‐block‐poly(caprolactone) copolymers, P(HEMA‐g‐PCL)‐b‐PCL, by combining ring‐opening polymerization (ROP) and reversible addition‐fragmentation chain‐transfer polymerization (RAFT). The successful synthesis of the targeted “comb‐like” block copolymers obtained was confirmed by 1H‐Nuclear Magnetic Resonance, Fourier Transform Infrared Spectroscopy and Size Exclusion Chromatography. Thermal behavior of the copolymers was studied by Differential Scanning Calorimetry, and their thermal stability was investigated by modulated thermogravimetric analysis. In this sense, the “comb‐like” block copolymers exhibited controlled molar masses between 6,000 g/mol and 45,000 g/mol, and polydispersity indexes lower than 1.3. Besides, thermal analysis evidenced a noticeable reduction in the melting temperature compared with linear PCL homopolymer, as well as, in the activation energy for the degradation process.

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Section: Resultssupporting

confidence: 81%

Section: Resultsmentioning

confidence: 98%

Thermal Characterization of “Comb‐Like” Block Copolymers Based on PCL Obtained by Combining ROP and RAFT Polymerizations

Ninago

Ciolino

Villar

et al. 2016

Macromolecular Symposia

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“…This polymer exhibited three weight loss stages at 120–195°C, 200–315°C, 320–420°C, respectively. Previous studies have shown that methacrylic acid ester polymers suffered degradation at lower temperatures. These studies suggested that degradation mechanism at lower temperatures is related to the bond cleavage in the ester group (between the carbonyl group and oxygen) and, the polymeric backbone degraded at higher temperatures.…”

Section: Resultsmentioning

confidence: 96%

Synthesis and characterization of sulfonated fluorinated block copolymer membranes with different esterified initiators for DMFC applications

Guerrero‐Gutiérrez

Pérez‐Pérez

Suleiman

2015

J of Applied Polymer Sci

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This investigation studied the synthesis of ionic membranes composed of a sulfonated poly(styrene‐isobutylene‐styrene) with novel fluoroblock copolymers. These fluoroblock copolymers were synthesized using three different initiators by Atom Transfer Radical Polymerization (ATRP); two fluoroinitiators were obtained from the esterification of 2‐(perfluoroalkyl) ethanol or octafluoro 4‐4′‐biphenol. The third initiator evaluated was 1‐bromoethyl benzene. The resulting block copolymers were characterized using several techniques: Gel Permeation Chromatography, Nuclear Magnetic Resonance, Fourier Transform Infrared Spectroscopy, Ultraviolet Spectroscopy, Thermogravimetric Analysis, and Differential Scanning Calorimetry. Transport properties (e.g., proton conductivity and methanol permeability) were measured to evaluate their performance for direct methanol fuel cell (DMFC). The choice of ATRP initiator was found to have a profound impact on the thermal stability of the different homopolymers and block copolymers studied. In addition, the chemical nature and symmetry of the initiators can lead to different chemical and electronic transitions, which influence the performance of these ionic membranes in applications such as proton exchange membranes for DMFC applications. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42046.

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“…Polystyrene (PS) is a commodity polymer used in many fields, such as packaging of electrical equipment, apparatus, instruments, and food; as thermal insulation material for buildings; for cold storage purposes; and for disposable meal services . PS has good optical and chemical properties that are employed for specific applications, such as aircraft glazing, signs, lighting, architecture, transportation, engineering, and high‐performance products .…”

Section: Introductionmentioning

confidence: 99%

Enhancement of mechanical and optical performance of commercial polystyrenes by blending with siloxane‐based copolymers

Ninago

Hanazumi

Passaretti

et al. 2017

J of Applied Polymer Sci

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Well‐defined poly(styrene‐block‐dimethylsiloxane) copolymers (PS‐b‐PDMS) with low polydispersity index (Mw/Mn) and different compositions were synthesized by sequential anionic polymerization of styrene (S) and hexamethyl(ciclotrisiloxane) (D3) monomers. Synthesized PS‐b‐PDMS copolymers were characterized by 1H‐nuclear magnetic resonance, size exclusion chromatography, Fourier transform infrared spectroscopy, and transmission electron microscopy. The physicochemical characterization determined that block copolymers have molar mass values close to ∼135,000 g mol−1, narrow Mw/Mn < 1.3, and chemical composition ranging from low to intermediate PDMS content. Blends of these copolymers with a commercial polystyrene (PS) were obtained by melt mixing and subsequently injection. Films obtained were flexible, and showed lower transparency than the original PS matrix. On the other hand, a 10 wt % incorporation of PS‐b‐PDMS copolymers leads to better mechanical performance by enhancing elongation at break (∼8.8 times higher) and opacity values (∼18 times higher). In addition, UV–Vis barrier capacity of the resulting blends is also increased (up to 400% higher). © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45122.

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A novel HEMA-derived monomer and copolymers containing side-chain thiophene units: Synthesis, characterization and thermal degradation kinetics

Cited by 13 publications

References 44 publications

Thermal Characterization of “Comb‐Like” Block Copolymers Based on PCL Obtained by Combining ROP and RAFT Polymerizations

Thermal Characterization of “Comb‐Like” Block Copolymers Based on PCL Obtained by Combining ROP and RAFT Polymerizations

Synthesis and characterization of sulfonated fluorinated block copolymer membranes with different esterified initiators for DMFC applications

Enhancement of mechanical and optical performance of commercial polystyrenes by blending with siloxane‐based copolymers

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