Molecular Origin of Solvent Resistance of Polyacrylonitrile

Lachat, Veronique; Varshney, Vikas; Dhinojwala, Ali; Yeganeh, M. S.

doi:10.1021/ma901336q

Cited by 43 publications

(32 citation statements)

References 26 publications

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“…This is due to the strong affinity between the CN-CN groups (within the polymer) compared to the CN-surface OH interactions. 19 We have also observed a shift in the CN peak due to the interactions of the CN group with the surface OH groups. The PIB is the most hydrophobic polymer that we have studied, and the small red shift of 30 cm -1 is similar to that of sapphire in contact with nonpolar pentadecane.…”

Section: Resultsmentioning

confidence: 61%

Direct Measurement of Acid−Base Interaction Energy at Solid Interfaces

2010

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We have studied acid-base interactions at solid-liquid and solid-solid interfaces using interface-sensitive sum frequency generation (SFG) spectroscopy. The shift of the sapphire hydroxyl peak in contact with several polar and nonpolar liquids and polymers was used to determine the interaction energy. The trend in the interaction energies cannot be explained by measuring only water contact angles. Molecular rearrangements at the sapphire interface, to maximize the interaction of the acid-base groups, play a dominant role, and these effects are not accounted for in the current theoretical models. These results provide important insights into understanding adhesion, friction, and wetting on solid interfaces.

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Section: Resultsmentioning

confidence: 61%

Direct Measurement of Acid−Base Interaction Energy at Solid Interfaces

2010

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“…Surface structures of polyacrylonitrile (PAN) at the buried PAN/sapphire interface were examined using SFG [173]. After annealing the sample for 8 h at 90 °C and then 4 h at 120 °C (above PAN T g of 80–100 °C), it was found that the SFG signal of the CN frequency shifted from 2242 cm −1 (probed by FTIR) in the bulk to 2254 cm −1 (probed by SFG).…”

Section: Buried Polymer/inorganic Solid and Polymer/polymer Interfmentioning

confidence: 99%

Investigating buried polymer interfaces using sum frequency generation vibrational spectroscopy

Chen

2010

Progress in Polymer Science

149

144

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This paper reviews recent progress in the studies of buried polymer interfaces using sum frequency generation (SFG) vibrational spectroscopy. Both buried solid/liquid and solid/solid interfaces involving polymeric materials are discussed. SFG studies of polymer/water interfaces show that different polymers exhibit varied surface restructuring behavior in water, indicating the importance of probing polymer/water interfaces in situ. SFG has also been applied to the investigation of interfaces between polymers and other liquids. It has been found that molecular interactions at such polymer/liquid interfaces dictate interfacial polymer structures. The molecular structures of silane molecules, which are widely used as adhesion promoters, have been investigated using SFG at buried polymer/silane and polymer/polymer interfaces, providing molecular-level understanding of polymer adhesion promotion. The molecular structures of polymer/solid interfaces have been examined using SFG with several different experimental geometries. These results have provided molecular-level information about polymer friction, adhesion, interfacial chemical reactions, interfacial electronic properties, and the structure of layer-by-layer deposited polymers. Such research has demonstrated that SFG is a powerful tool to probe buried interfaces involving polymeric materials, which are difficult to study by conventional surface sensitive analytical techniques.

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“…However, in the absence of water, nitrile groups will complex with sodium ion . Considering chemical properties of the nitrile group, this interaction can be attributed to the electron donating nature of the nitrile group …”

Section: Resultsmentioning

confidence: 99%

“…[48,49] Considering chemical properties of the nitrile group, this interaction can be attributed to the electron donating nature of the nitrile group. [2,21,50] Hence, in current studies, an attempt has been made in order to explain the role of the interactions between nitrile group and cations in the dissolution of PAN homo-polymer in [BMIM]Cl. This dissolution should be caused by the interruption and breaking of the dipolar-dipolar interactions of PAN [1,51] , and the formation of interactions between ÀCN group and 1-butyl-3-methylimidazolium cation [BMIM] + .…”

Section: Interactions Between Pan Molecules and [Bmim]clmentioning

confidence: 99%

“…The dipolar–dipolar interactions of the nitrile groups (−C≡N) in polyacrylonitrile (PAN) are so strong that only some specific solvents can break these interactions, resulting in very unique properties (such as the resistance to chemical and physical attack) . Textile acrylic fibers are made from polymers of acrylonitrile (AN), usually with at least one other comonomer .…”

Section: Introductionmentioning

confidence: 99%

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Understanding the interactions in acrylic copolymer/1‐butyl‐3‐methylimidazolium chloride from solution rheology

Zhu

Chen

Wang

et al. 2012

Polymers for Advanced Techs

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The effects of the type and content of comonomers on the rheological properties of acrylic copolymers in 1‐butyl‐3‐methylimidazolium chloride ([BMIM]Cl) were explored. According to the de Gennes scaling law for solution, comparison of intrinsic viscosity and scaling analysis of the exponent in the specific viscosity‐ and relaxation time‐concentration power law indicated that solution of both polyacrylonitrile (PAN) homo‐polymer and copolymer poly(acrylonitrile‐co‐methyl acrylate) (poly(AN‐co‐MA)) in [BMIM]Cl behave in the same manner as neutral polymer in a θ‐solvent. However, [BMIM]Cl acts as a more good solvent for poly(acrylonitrile‐co‐acrylamide) (poly(AN‐co‐AM)). The dissolution and unique rheological behavior of such solutions have been attributed to the interactions between copolymer chains and [BMIM]Cl. The interactions between nitrile group (−C≡N) and 1‐butyl‐3‐methylimidazolium cation ([BMIM]+) should interrupt and break the dipolar‐dipolar interactions of PAN resulting in the subsequent dissolution of the polymer in [BMIM]Cl. Such interactions between −C≡N and [BMIM]+ ion are still dominated by the solvating ability of poly(AN‐co‐MA) in [BMIM]Cl, even though carbonyl group (C=O) in MA repeating unit could coordinate to cation of the ionic liquid. The salvation capacity of [BMIM]Cl for poly(AN‐co‐AM) can be evidently improved due to the extra hydrogen bond interactions between −NH2 group of AM and anion of [BMIM]Cl. Copyright © 2012 John Wiley & Sons, Ltd.

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Molecular Origin of Solvent Resistance of Polyacrylonitrile

Cited by 43 publications

References 26 publications

Direct Measurement of Acid−Base Interaction Energy at Solid Interfaces

Direct Measurement of Acid−Base Interaction Energy at Solid Interfaces

Investigating buried polymer interfaces using sum frequency generation vibrational spectroscopy

Understanding the interactions in acrylic copolymer/1‐butyl‐3‐methylimidazolium chloride from solution rheology

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