Miscibility of polymer blends of poly(styrene-co-4-hydroxystyrene) with bisphenol-A polycarbonate

Li, Guangxian; Cowie, J. M. G.; Arrighi, Valeria

doi:10.1002/(sici)1097-4628(19991017)74:3<639::aid-app17>3.0.co;2-v

Cited by 16 publications

(5 citation statements)

References 28 publications

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“…We next consider the Fourier transform infrared spectroscopy (FTIR) data presented in Figure , which verify the role of hydrogen bonding in driving reversible aggregation and redispersion. Three characteristic IR bands were monitored: free hydroxyl stretching around 3540 cm –1 , pyridine flexion at 1597 cm –1 , and pyridine stretching at 993 cm –1 . The hydroxyl stretching region is broad (from 3000 to 3600 cm –1 ), but with a clear peak at 3540 cm –1 assigned to free hydroxyls from non-hydrogen bonded 4VPh units (Figure a).…”

Section: Resultsmentioning

confidence: 99%

Thermally Reversible Aggregation of Gold Nanoparticles in Polymer Nanocomposites through Hydrogen Bonding

et al. 2013

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The ability to tune the state of dispersion or aggregation of nanoparticles within polymer-based nanocomposites, through variations in the chemical and physical interactions with the polymer matrix, is desirable for the design of materials with switchable properties. In this study, we introduce a simple and effective means of reversibly controlling the association state of nanoparticles based on the thermal sensitivity of hydrogen bonds between the nanoparticle ligands and the matrix. Strong hydrogen bonding interactions provide excellent dispersion of gold nanoparticles functionalized with poly(styrene-r-2-vinylpyridine) [P(S-r-2VP)] ligands in a poly(styrene-r-4-vinyl phenol) [P(S-r-4VPh)] matrix. However, annealing at higher temperatures diminishes the strength of these hydrogen bonds, driving the nanoparticles to aggregate. This behavior is largely reversible upon annealing at reduced temperature with redispersion occurring on a time-scale of ~30 min for samples annealed 50 °C above the glass transition temperature of the matrix. Using ultraviolet-visible absorption spectroscopy (UV-vis) and transmission electron microscopy (TEM), we have established the reversibility of aggregation and redispersion through multiple cycles of heating and cooling.

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Section: Resultsmentioning

confidence: 99%

Thermally Reversible Aggregation of Gold Nanoparticles in Polymer Nanocomposites through Hydrogen Bonding

et al. 2013

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“…To increase its glass transition temperature, PMMA can be mixed using an extrusion screw or synthesized from free radical copolymerization with various monomers [7][8][9]. Enhancing heat resistance might reduce the transparent nature of PMMA, thereby restricting its applications [10][11][12][13][14]; thus, it is essential to increase the heat-resistant properties of PMMA while maintaining excellent transparency, which has been widely discussed in our previous studies [15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Transparent Heat-Resistant PMMA Copolymers for Packing Light-Emitting Diode Materials

2015

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Transparent and heat-resistant poly(methyl methacrylate) copolymers were synthesized by bulk polymerizing methyl methacrylate (MMA), isobornyl methacrylate (IBMA), and methacrylamide (MAA) monomers. Copolymerization was performed using a chain transfer agent to investigate the molecular weight changes of these copolymers, which exhibited advantages including a low molecular weight distribution, excellent optical properties, high transparency, high glass transition temperature, low moisture absorption, and pellets that can be readily mass produced by using extrusion or jet injection for packing light-emitting diode materials.

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“…In general, the most representative compatibilization method is the addition of a block or graft copolymer, and this has been applied to several immiscible polymer systems 1–3. In PS/PC compatibilization, polystyrene copolymers having segments or functional groups able to interact with PC4, 5 and statistical copolycarbonates based on bisphenol A and tetramethyl bisphenol A have been already used 6…”

Section: Introductionmentioning

confidence: 99%

Hepatitis C Drug Development at a Crossroads†

Nelson

2009

Hepatology

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Block‐copolymers containing poly(2,6‐dimethyl‐1,4‐phenylene oxide) (PPO) and polycarbonate of bisphenol A (PC) segments were employed as compatibilizers in polystyrene (PS)/PC blends. Block‐copolymers were prepared starting from oligomeric diols‐terminated PPO and PC. The poly(phenylene ethers) was obtained by oxidative coupling of 2,6‐dimethyl‐phenol in presence of tetramethyl bisphenol A. The copolymers were obtained with a chain extension reaction between the starting oligomers using bischloroformate of bisphenol A or phosgene as coupling agent. PS/PC blends, cast from chloroform solutions or mixed by melt, were studied by differential scanning calorimeter (DSC), dynamic‐mechanical thermal analysis (DMTA), and optical microscopy (OP). The thermal and morphological analyses showed a clear compatibilization effect between PS and PC, if PPO–PC copolymer is added when blending is performed in the melt; in addition, also mechanical properties are increased when compared with blends without PPO–PC. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 4654–4660, 2006

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Miscibility of polymer blends of poly(styrene-co-4-hydroxystyrene) with bisphenol-A polycarbonate

Cited by 16 publications

References 28 publications

Thermally Reversible Aggregation of Gold Nanoparticles in Polymer Nanocomposites through Hydrogen Bonding

Thermally Reversible Aggregation of Gold Nanoparticles in Polymer Nanocomposites through Hydrogen Bonding

Transparent Heat-Resistant PMMA Copolymers for Packing Light-Emitting Diode Materials

Hepatitis C Drug Development at a Crossroads†

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