Hydrogen bonding in polymer blends. 1. FTIR studies of urethane-ether blends

Coleman, Michael M.; Skrovanek, Daniel J.; Hu, Jiangbin; Painter, Paul C.

doi:10.1021/ma00179a014

Cited by 525 publications

(371 citation statements)

References 6 publications

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“…However, this exceptional phenomenon was not contradictive to the above-mentioned redshift criterion. Since, the C=O acceptor groups and N-H donor groups in polyurethane can form intermolecular hydrogen bond (13,14), while the H bond acceptors in DP might disrupt the original intermolecular hydrogen bond by forming new hydrogen bond with N-H donor groups in polyurethane. According to literatures (15), it could be concluded that all H bond acceptors in DP had weaker electronegativity than the C=O H bond acceptor in polyurethane, thus inducing the electron rearrangement of H atom in the N-H group and the blueshift of the N-H group stretching absorption (16).…”

Section: Atr-ftir Measurementsmentioning

confidence: 99%

Effect of Backing Films on the Transdermal Delivery of Donepezil from Patches

et al. 2014

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Abstract. The aim of this work was to investigate the effect of backing films on transdermal delivery of donepezil (DP) from patches. Three backing films, Cotran TM 9700, Cotran TM 9701, and Cotran TM 9726 were chosen as backing layers to prepare transdermal patches containing DP. The transdermal penetration and release amount of DP from each patch were evaluated by rabbit abdominal skin in vitro. The partitioning experiments and attentuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy were performed to confirm the existence of interaction between backing films and DP. Results showed that the cumulative release amount of DP from patches with different backing films had the same order of cumulative amount penetrated, i.e. Cotran TM 9701

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Section: Atr-ftir Measurementsmentioning

confidence: 99%

Effect of Backing Films on the Transdermal Delivery of Donepezil from Patches

et al. 2014

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“…Subsequently, a considerable interest arose for the chemical modification, such as graft copolymerization, as a way to improve the properties of the polymer materials. However, due to the high costs and environment pollution involved in the polymer synthesis processes, the study of polymer blends was notably developed in the last few decades [1][2][3][4][5][6] . These blends, by means of the simple mix of functionalized homo and copolymers, have been a very useful way to obtain new materials with novel properties [7][8][9][10] .…”

Section: Introductionmentioning

confidence: 99%

Blends of Poly(4-Vinylpyridine) and Dihydric Phenols: Thermal and Infrared Spectroscopic Studies. Part Iii

Gatica¹,

MONARES²

2010

J. Chil. Chem. Soc.

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The blending of the functionalized vinyl polymer poly(4-vinylpyridine) (P4VPy) with the low molecular weight compounds 4,4'-biphenol (44BP) and 2,2'-biphenol (22BP) was studied. The binary systems formed by P4VPy and 44BP (blend A) and by P4VPy and 22BP (blend B) were characterized by Differential Scanning Calorimetry (DSC) to study the effect of the blending on characteristic transition, such as the glass transition of P4VPy and the melting of 44BP and 22BP. The results suggest the postulate that the components of both blends are miscible, with a comparatively higher intermolecular interaction level in the case of blend A. Using Fourier Transform Infrared Spectroscopy (FTIR), the formation of hydrogen bonding between the components of the blends A and B was detected. The behaviour observed with the FTIR corroborates the DSC results. Thermogravimetric Analysis (TGA) and Scanning Electron Microscopy (SEM) were used as additional analytical techniques and the results show a good agreement with the DSC and FTIR results and they complement the characterization of the studied systems.

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“…The extent of carbonyl absorotion group participating in hydrogen bonding is expressed by HBI, which is as the relative absorbances of the hydrogen-bonded carbonyl peak to that of free hydrogen-bonded carbonyl peak. [22][23][24] mechanical measurements were made on sample of size 50 Â 10 Â 0:25 mm 3 using a tensile machine (mode TCF-R) made by Yashima works Ltd. at a crosshead speed of 20 mm/min. At least five samples were employed to yield final data by average.…”

Section: Characterization and Property Measurementsmentioning

confidence: 99%

Miscibility and Properties of Acid-Treated Multi-Walled Carbon Nanotubes/Polyurethane Nanocomposites

Lee

Liu

Chen

et al. 2006

Polym J

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ABSTRACT:Nanocomposites based on polyurethane and acid-treatment multi-walled carbon nanotubes (AMWNTs) are prepared by solution blending. The surface of the MWNTs was modified by acid treatment to incorporated functional groups. The modified MWNTs exhibited improved dispersion in organic solvents and miscibility with the PU matrix. The derivatives of MWNTs were characterized by Fourier transform infrared (FT-IR) spectroscopy, Transmission electron microscopy (TEM) and Raman spectroscopy. The thinning and defects of the A-MWNT from the surface etching of acid treatment can be clearly seen from TEM pictures and Raman spectra, respectively. The interaction and degree of miscibility between the MWNTs and the PU matrix is examined using FT-IR, modulated differential scanning calorimeter (MDSC), TEM and atomic force microscopy (AFM). The hydrogen bonding index (HBI) measured by FT-IR was employed to show the degree of interchange hydrogen bonding. Composites films with higher A-MWNT content exhibit higher HBI and the degree of miscibility is significantly improved. The resultant composites have higher tensile strength, higher Young's modulus and lower elongation at break because of the rigid structure of A-MWNT and the increase in the number of hydrogen bonds among the composites. Incorporating A-MWNT in composites increases the mass of the residue at temperatures over

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Hydrogen bonding in polymer blends. 1. FTIR studies of urethane-ether blends

Cited by 525 publications

References 6 publications

Effect of Backing Films on the Transdermal Delivery of Donepezil from Patches

Effect of Backing Films on the Transdermal Delivery of Donepezil from Patches

Blends of Poly(4-Vinylpyridine) and Dihydric Phenols: Thermal and Infrared Spectroscopic Studies. Part Iii

Miscibility and Properties of Acid-Treated Multi-Walled Carbon Nanotubes/Polyurethane Nanocomposites

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