Branching in polystyrene

Henrici‐Olivé, G.; Olivé, S.

doi:10.1002/pol.1960.1204815031

Cited by 59 publications

(67 citation statements)

References 5 publications

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“…The unusually high content of a hexene isomer in II (11.5%) may be attributed to a competing reaction with 1-butene. With 4d, lower oligomers with a Schultz-Flory distribution [18] and large amounts of 1-butene, 1-hexene, and octenes were observed. The mono-PMe 3 complexes form longer chain oligomers with broad, flat maxima in their molar weight distributions.…”

Section: Structural Aspectsmentioning

confidence: 95%

Methyl(2-phosphanylphenolato[P,O])nickel(II) Complexes – Synthesis, Structure, and Activity as Ethene Oligomerization Catalysts

Heinicke

Dal

et al. 2000

Eur. J. Inorg. Chem.

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Section: Structural Aspectsmentioning

confidence: 95%

Methyl(2-phosphanylphenolato[P,O])nickel(II) Complexes – Synthesis, Structure, and Activity as Ethene Oligomerization Catalysts

Heinicke

Dal

et al. 2000

Eur. J. Inorg. Chem.

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“…6,17,18 Blue and red shifts of the nitrile stretching absorption band are possible for both acetonitrile and PAN. The direction of the shift is diagnostic of the interaction of nitrile with surrounding molecules.…”

Section: Resultsmentioning

confidence: 99%

“…More unusually, a large red shift of the CN frequency (2050 cm ) has also been reported for PAN upon exposure to water at high temperature and pressure. 6,18 It has been suggested that at these temperatures and pressures the CN-CN interactions are broken and PAN forms a one-phase system. The shift in the frequency of the CN band was reversible, indicating that these changes in the CN bands cannot be due to possible chemical reaction.…”

Section: Introductionmentioning

confidence: 99%

“…It has been suggested that the CN triple bond can interact using two available molecular orbitals. [6][7][8] The first one is the lone pair orbital of the nitrogen, and the second one is the π orbital of the triple bond CN. The interaction via the lone pair orbital of the nitrogen atoms results in a positive (blue) shift of the CN stretch vibration.…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, the microstructure of PAN is suggested to have a low degree of crystallinity and a very high melting point. 6,[9][10][11] The current IR assignments and the shifts in the peak positions with environment for CN are available using a small molecule analogue such as acetonitrile. 7,[12][13][14][15][16] The CN infrared stretching vibration band occurs at 2253 cm -1 in acetonitrile liquid, and the position of this band changes from 2253 to 2257 cm -1 upon interaction with various solvents.…”

Section: Introductionmentioning

confidence: 99%

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Molecular Origin of Solvent Resistance of Polyacrylonitrile

et al. 2009

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We report on the first in-situ sum frequency generation (SFG) spectroscopy characterization of polyacrylonitrile (PAN) interfacial interactions with air, sapphire, water, and heptane. Using the shift in the resonance frequency of CN at various interfaces, we demonstrated that PAN interacts with the surface hydroxyl of sapphire substrate through the lone pair orbital of nitrogen in the "end-on" configuration (σ-H bond). We also demonstrated that the CN-CN interaction is the main reason for the superior chemical resistance property of PAN. At room temperature the interaction between the polymer chains is much stronger than the interaction between the polymer and solvent molecules including water and heptane. At high temperatures, however, the interaction between the nitrile groups of the polymer weakens, making interaction possible between the nitrile groups and the surface hydroxyls of the substrate and water. These results provide an important insight as to why acrylonitrile when copolymerized with butadiene to form nitrile rubber results in one of the best known synthetic oil-resistant rubber.

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Miscibility and specific interactions in polyacrylonitrile/ poly(p-vinylphenol) blends

Goh¹,

Lee

Yeo

et al. 1999

Macromol. Rapid Commun.

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SUMMARY:A rare miscible polyacrylonitrile (PAN) blend system is reported. PAN is miscible with poly(pvinylphenol) (PVPh) as shown by thermal and spectroscopic studies. A single glass transition temperature was found in each blend. Infrared spectroscopic studies showed that the hydroxyl band of PVPh and the cyano band of PAN shifted to lower frequencies upon blending, showing the existence of specific interactions between the two polymers. The involvement of cyano groups in specific interactions was further evidenced by the development of a high-binding-energy N1s peak in each blend from X-ray photoelectron spectroscopic studies.

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Branching in polystyrene

Cited by 59 publications

References 5 publications

Methyl(2-phosphanylphenolato[P,O])nickel(II) Complexes – Synthesis, Structure, and Activity as Ethene Oligomerization Catalysts

Methyl(2-phosphanylphenolato[P,O])nickel(II) Complexes – Synthesis, Structure, and Activity as Ethene Oligomerization Catalysts

Molecular Origin of Solvent Resistance of Polyacrylonitrile

Miscibility and specific interactions in polyacrylonitrile/ poly(p-vinylphenol) blends

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