Miscibility of polystyrene with poly(ethylene oxide) and poly(ethylene glycol)

Abdel‐Azim, Abdel‐Azim A.; Atta, Aiman M.; Farahat, Medhat S.; Boutros, Wagdy Y.

doi:10.1002/(sici)1097-4628(19980822)69:8<1471::aid-app1>3.0.co;2-9

Cited by 15 publications

(2 citation statements)

References 11 publications

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“…The cationic surfactant cetyl pyridinium chloride only interacts with high molecular weight PVP or poly(ethylene glycol) (PEG) 12. The viscosity of polystyrene (PS)–PEO and PS–PEG blends was measured in benzene as a function of the blend composition, and the interaction parameter used was the difference between the experimental and the theoretical values of the two polymers 13. Through viscometry, Ylmaz et al 14 showed that in dilute solutions, PS–PEO and polybutadiene‐ graft ‐polystyrene (PBS)–PEO are immiscible systems, and the miscibility parameter decreases with the increase in temperature.…”

Section: Introductionmentioning

confidence: 99%

Total Synthesis of Woodrosin I—Part 1: Preparation of the Building Blocks and Evaluation of the Glycosylation Strategy

Fürstner

Jeanjean

Razon

et al. 2002

Chemistry A European J

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The preparation of three building blocks required for the total synthesis of woodrosin I (1) is outlined, a complex resin glycoside bearing a macrolide ring which spans four of the five sugars of its oligosaccharide backbone. Key steps involve the enantioselective, titanium-catalyzed addition of dipentylzinc to 5-hexenal, the glycosylation of the resulting alcohol 18 with the glucose-derived trichloroacetimidate 7, and further elaboration of the resulting product 19 into disaccharide 22 on treatment with the orthogonally protected glycosyl donor 15. The trichloroacetimidate method is also used for the formation of the second synthon represented by disaccharide 38. A model study shows that the assembly of the pentasaccharidic perimeter of 1 depends critically on the phasing of the glycosylation events between fragments 22, 38 and the rhamnosyl donor 27 due to the severe steric hindrance in the product. A particularly noteworthy finding is the fact that diol 22 can be regioselectively glycosylated at the 3'-OH group in high yield without protection of the neighboring 2'-OH function.

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Section: Introductionmentioning

confidence: 99%

Total Synthesis of Woodrosin I—Part 1: Preparation of the Building Blocks and Evaluation of the Glycosylation Strategy

Fürstner

Jeanjean

Razon

et al. 2002

Chemistry A European J

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“…This was conducted to compare with the samples prepared from the organoclay and the intensive translucence, which was noticed with an increment of both the clay loadings and PEG contents. This is ascribed to the partial compatibility of the PS‐PEG blends . Although the blend system of the PS and PEG showed partial miscibility, the exfoliated nanocomposites were fulfilled by using the C10_P10 of the dry nanoclay gel formula to prepare the PS/clay nanocomposites via melt processing.…”

Section: Resultsmentioning

confidence: 99%

Fabrication of nanoclay gel composite: A novel nanoclay masterbatch approach to nanocomposite preparation via melt extrusion process

Luecha

Magaraphan

2018

Polymer Composites

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The objective of this research was to fabricate a novel nanoclay masterbatch containing polymer‐intercalated in nanoclay with comparable degree of interlayer expansion, flowability, and high thermal stability. It is ready to use for preparing polymer/clay nanocomposites by melt extrusion. The nanoclay masterbatch was efficiently prepared in one‐step via a new approach called nanoclay gel. The nanoclay gels were successfully prepared at different original nanoclay concentrations ranging from low to high clay loading (10%, 20%, and 30% w/v) in cooperation with polyethylene glycol (PEG) at various PEG loadings (weight ratios of nanoclay/PEG 1/1, ½, and 1/3) and kappa carrageenan (KC), a thermolytic hydrogel at a fixed minimum concentration. X‐ray diffraction (XRD) results revealed that the intercalation of PEG molecules expanded silicate basal spacing up to 17–18 A° even at high percentage of nanoclay (dry content about 24–49 wt%). Scanning electron microscope (SEM) revealed the denser packing of clay layers in accordance to an increase in density of the dry nanoclay gel with increment of original nanoclay loadings. An increase of PEG content exhibited better flow ability as seen by increasing melt flow index. Thermal decomposition of the nanoclay gels was up to 380°C; by using the dry nanoclay gels to prepare polystyrene (PS)/clay nanocomposites via melt extrusion. The morphological results showed that the exfoliated structures were achieved. The mechanical and thermal stability properties were significantly enhanced. The appearing color of PS/clay nanocomposites prepared from nanoclay gel was bright pale‐yellow without evidence of thermal degradation. POLYM. COMPOS., 40:2751–2767, 2019. © 2018 Society of Plastics Engineers

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Poly(ethylene oxide)-polyelectrolyte blends: viscometric and thermal analysis behaviour

et al. 2000

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Miscibility of polystyrene with poly(ethylene oxide) and poly(ethylene glycol)

Cited by 15 publications

References 11 publications

Total Synthesis of Woodrosin I—Part 1: Preparation of the Building Blocks and Evaluation of the Glycosylation Strategy

Total Synthesis of Woodrosin I—Part 1: Preparation of the Building Blocks and Evaluation of the Glycosylation Strategy

Fabrication of nanoclay gel composite: A novel nanoclay masterbatch approach to nanocomposite preparation via melt extrusion process

Poly(ethylene oxide)-polyelectrolyte blends: viscometric and thermal analysis behaviour

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