Reorganization and improvement of bulk polymers by processing with their cyclodextrin inclusion compounds

Uyar, Tamer; Rusa, Cristian C.; Hunt, Martin A.; Aslan, Evren; Hacaloğlu, Jale; Tonelli, Alan E.

doi:10.1016/j.polymer.2005.04.002

Cited by 55 publications

(53 citation statements)

References 35 publications

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“…It has been reported that the solid-state transformation between the monoclinic-and tetragonal-columnar forms is a reversible process upon water vapor adsorption and desorption with respect to the g-CD inclusion complexes formed with polymeric guests such as PEG, polypropylene glycol, and polymethylmethacrylate. 11,33 The reversible transition of g-CD crystal packing for the inclusion complexes was explained by the presence of adsorbed water in the intermolecular spaces between the columns. The tetragonal-columnar form was obtained by water vapor adsorption where the intermolecular spaces were expanded by adsorbed water.…”

Section: Molecular Arrangement Of Sa In 2:1 and 4:1 Complexesmentioning

confidence: 99%

Salicylic Acid/γ-Cydodextrin 2:1 and 4:1 Complex Formation by Sealed-Heating Method

Higashi

Tozuka

Moribe

et al. 2010

Journal of Pharmaceutical Sciences

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Section: Molecular Arrangement Of Sa In 2:1 and 4:1 Complexesmentioning

confidence: 99%

Salicylic Acid/γ-Cydodextrin 2:1 and 4:1 Complex Formation by Sealed-Heating Method

Higashi

Tozuka

Moribe

et al. 2010

Journal of Pharmaceutical Sciences

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“…The X‐ray diffraction from these coalesced blends showed a similar pattern with the main diffraction peak at 2θ = ∼18°, whereas coprecipitated physical blends exhibited a broad amorphous halo in that region. This crystalline phase may be a consequence of retention of the extended conformation required by inclusion in the narrow γ‐CD‐IC channels for the coalesced PC, as well as their partial segregation into proximal regions of the common γ‐CD‐IC crystals, as discussed previously,40 as well as the preferential inclusion of PC chains mentioned above. The crystalline behavior of PC was also observed for its coalesced homopolymer and its ternary PC/PMMA/PVAc blend 34, 39.…”

Section: Resultsmentioning

confidence: 73%

“…Thus, it may be concluded that the degradation mechanism of PMMA has changed in the coalesced sample, and the thermal degradation of PMMA was initiated by loss of side chains because of the interactions of PMMA with PVAc in the coalesced binary mixture instead of a depropagation mechanism as in the case of pure PMMA. Details of the pyrolysis mass spectrometry results are discussed elsewhere 50…”

Section: Resultsmentioning

confidence: 99%

Intimate blending of binary polymer systems from their common cyclodextrin inclusion compounds

Uyar

Rusa

Wang

et al. 2005

J Polym Sci B Polym Phys

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A procedure for the formation of intimate blends of three binary polymer systems polycarbonate (PC)/poly(methyl methacrylate) (PMMA), PC/poly(vinyl acetate) (PVAc) and PMMA/PVAc is described. PC/PMMA, PC/PVAc, and PMMA/PVAc pairs were included in γ‐cyclodextrin (γ‐CD) channels and were then simultaneously coalesced from their common γ‐CD inclusion compounds (ICs) to obtain intimately mixed blends. The formation of ICs between polymer pairs and γ‐CD were confirmed by wide‐angle X‐ray diffraction (WAXD), fourier transform infrared spectroscopy (FTIR), and differential scanning calorimetry (DSC). It was observed [solution 1H nuclear magnetic resonance (NMR)] that the ratios of polymers in coalesced PC/PMMA and PC/PVAc binary blends are significantly different than the starting ratios, and PC was found to be preferentially included in γ‐CD channels when compared with PMMA or PVAc. Physical mixtures of polymer pairs were also prepared by coprecipitation and solution casting methods for comparison. DSC, solid‐state 1H NMR, thermogravimetric analysis (TGA), and direct insertion probe pyrolysis mass spectrometry (DIP‐MS) data indicated that the PC/PMMA, PC/PVAc, and PMMA/PVAc binary polymer blends were homogeneously mixed when they were coalesced from their ICs. A single, common glass transition temperature (Tg) recorded by DSC heating scans strongly suggested the presence of a homogeneous amorphous phase in the coalesced binary polymer blends, which is retained after thermal cycling to 270 °C. The physical mixture samples showed two distinct Tgs and 1H T1ρ values for the polymer components, which indicated phase‐separated blends with domain sizes above 5 nm, while the coalesced blends exhibited uniform 1H spin‐lattice relaxation values, indicating intimate blending in the coalesced samples. The TGA results of coalesced and physical binary blends of PC/PMMA and PC/PVAc reveal that in the presence of PC, the thermal stability of both PMMA and PVAc increases. Yet, the presence of PMMA and PVAc decreases the thermal stability of PC itself. DIP‐MS observations suggested that the degradation mechanisms of the polymers changed in the coalesced blends, which was attributed to the presence of molecular interactions between the well‐mixed polymer components in the coalesced samples. © 2005 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 43: 2578–2593, 2005

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“…2). while approximately 15 wt% residue remained at 500 C. TGA profile of PEG 6000 showed complete degradation of the complex in the range from 300 C to 420 C. On the other hand, TGA curves of the poly(rotaxan)s showed a two stage weight loss pattern attributed to the degradation of the a CDs and PEG PMMA [53] parts in temperature ranges from 250 C to 350 C and 350 C to 420 C respectively. It is worthy to note that the poly(rotaxan)s are stable in the range of temperatures used during the solvent elimination process.…”

Section: Thermal Propertiesmentioning

confidence: 95%

Synthesis of novel nanoreinforcements for polymer matrices by ATRP: Triblock poly(rotaxan)s based in polyethyleneglycol end-caped with poly(methyl methacrylate)

Miguel

González

Pozuelo

et al. 2009

Polymer

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Poly(rotaxan)s of poly(ethylene glycol) and a cyclodextrines (CD) block copolymers end capped with poly(methyl methacrylate) chains were synthesized by atom transfer radical polymerization. The synthesized copolymers were characterized by 1 H NMR, 2D NOESY NMR, X ray and Thermogravimetric analysis. Assuming a maximum relation of 2 CDs per ethyleneglycol unit, a coverage degree of 18% and 15% was achieved. X ray analysis showed a characteristic signal around 20q for all copolymers with an amorphous halo mainly due to inter crystal poly(ethylene glycol) and poly(methyl methacrylate) chains. Full Molecular Dynamics of 20 ns was used to simulate the crystal structure of these copolymers. A pair correlation function was used to determine the coupling between hydrogen atoms of PEG, PMMA and cyclodextrine obtained by 2D NOESY NMR.

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Reorganization and improvement of bulk polymers by processing with their cyclodextrin inclusion compounds

Cited by 55 publications

References 35 publications

Salicylic Acid/γ-Cydodextrin 2:1 and 4:1 Complex Formation by Sealed-Heating Method

Salicylic Acid/γ-Cydodextrin 2:1 and 4:1 Complex Formation by Sealed-Heating Method

Intimate blending of binary polymer systems from their common cyclodextrin inclusion compounds

Synthesis of novel nanoreinforcements for polymer matrices by ATRP: Triblock poly(rotaxan)s based in polyethyleneglycol end-caped with poly(methyl methacrylate)

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