Transition metal coordination for complexing polymer blends

Peiffer, Dennis G.; Duvdevani, I.; Agarwal, Pawan; Lundberg, R. D.

doi:10.1002/pol.1986.140241104

Cited by 62 publications

(26 citation statements)

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“…An even stronger interaction may be obtained by employing groups which carry positive and negative charges to form a Lewis acid-base pair in the blend. Blends in which proton transfer occurs from an acidic to a basic moiety, such as from a sulfonic acid to a basic nitrogen, have been studied by Eisenberg et al2- 5 More recently, Lundberg et al [6][7][8] have studied blends of a sulfonated ethylene-propylene-dene (SEPDM) rubber neutralized with a transition metal (Zn2') and polystyrene copolymerized with 4-vinylpyridine (SVP). Electron microscopy revealed distinct SPEDM and SVP domains in the blends, but the dramatic increase in ultimate extensibility compared with analogous unfunctionalized blends indicated that coordination of the vinylpyridine nitrogens to the Zn2+ cations provided good adhesion between the domains.…”

Section: Introductionmentioning

confidence: 99%

Morphology and cation local structure in a blend of copper‐neutralized carboxy‐terminated polybutadiene and poly(styrene‐co‐4‐vinylpyridine)

Sen²,

Weiß³

et al. 1989

J Polym Sci B Polym Phys

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Carboxy‐terminated polybutadiene neutralized with Cu2+ (CuPBD) and its blend with poly(styrene‐co‐4‐vinylpyridine) (SVP) were examined by differential scanning calorimetry (DSC), transmission electron microscopy (TEM), small‐angle x‐ray scattering (SAXS), and extended x‐ray absorption fine structure (EXAFS) spectroscopy. The DSC results indicate that in the blend substantial mixing occurs in the CuPBD‐rich phase, although complete miscibility is not achieved, and the SVP‐rich phase remains relatively pure. The TEM micrographs indicate that the morphology, while irregular, is reasonably described as bicontinuous, with a domain size of order 100 nm. The SAXS patterns show that the ionic aggregates present in CuPBD are destroyed upon blending, which is interpreted as being due to steric hindrances between ionic groups coordinated to vinylpyridine nitrogens. The EXAFS radial structure function of the blend exhibits a marked decrease in the Cu‐Cu peak in comparison with CuPBD, indicating a change in local structure upon blending. The results indicate that some of the SVP is miscible with CuPBD owing to complexation between the pendant pyridine groups and the Cu2+ ions, which disrupts the ionic aggregates. However, the two materials are not fully miscible, leading to a rather coarse two‐phase morphology.

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Section: Introductionmentioning

confidence: 99%

Morphology and cation local structure in a blend of copper‐neutralized carboxy‐terminated polybutadiene and poly(styrene‐co‐4‐vinylpyridine)

Sen²,

Weiß³

et al. 1989

J Polym Sci B Polym Phys

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“…For the zinc sulfonated EPDM/PSVP mixture, improvement in viscosity and dynamic properties was most pronounced at the stoichiometric composition (1 : 1) of sulfonate and pyridine groups. In addition, FTIR measurements were made and a shift in the carbon-nitrogen stretch absorption band confirmed the existence of a bonding interaction between the zinc ion and the pyridine group (4). (See Fig.…”

Section: Introductionmentioning

confidence: 91%

“…Peiffer, et al (4), studied blends of zinc neutralized sulfonated EPDM with poly(styrene-co-vinyl pyridine) (PSVP), while Belfiore (5) used NMR to investigate a similar interaction in a blend of poly ( v i n y l p y r i d i n e ) a n d poly ( e t h y l e n eco-methacrylic acid) partially neutralized with zinc. A blend of copper neutralized carboxyl terminated polybutadiene with poly(styrene-co-vinyl pyridine) miscibility due to the presence of a charge transfer interaction.…”

Section: Introductionmentioning

confidence: 99%

Reduction in domain size in polymer mixtures via charge transfer interactions

Clark¹,

Higgins²,

Peiffer³

1992

Polymer Engineering & Sci

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Blends of zinc neutralized sulfonated ethylene‐propylene‐diene elastomer (ZnS‐EPDM) with poly(styrene‐co‐vinyl pyridine) have been compared with mixtures of the unfunctionalized rubber with the same copolymer. These binary component blends contain relatively low levels of interacting groups, which are, however, sufficient for the formation of intermolecular complexes. As a result of these interactions, marked enhancement in properties have been observed. In this study, small angle neutron scattering (SANS) is used to determine domain dimensions. The SANS experiments clearly show a decrease in domain size by three orders of magnitude when compatibilization via the sulfonate groups takes place. This reduction correlates with large changes in mechanical properties.

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“…[5,10,21,22] Figure 6 is a typical plot of DSC curves for the blends of 6.8ZnCSEBS/BVP28.9. It can be seen that the 6.8ZnCSEBS triblock ionomer has two T g s, i. e., one at -41 8C associated with EB blocks, and the other one at 88 8C with ionomeric PS blocks.…”

Section: Complexation In Bulkmentioning

confidence: 99%

Intermacromolecular Complexation due to Specific Interactions, 14. The Chain Architectural Effect of Block Ionomers on Complexation

Zhang¹,

Jiang²,

Wu³

2001

Macromol. Chem. Phys.

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Series of diblock and triblock ionomers based on carboxylated polystyrene‐block‐poly(ethylene‐co‐propylene) (CSEP) and carboxylated polystyrene‐block‐poly(ethylene‐co‐butylene)‐block‐styrene) (CSE‐BS), i. e., the zinc salts of diblock ZnCSEP and triblock ZnCSEBS were prepared and, respectively, mixed with poly[(butyl methacrylate)‐co‐(4‐vinylpyridine)] (BVP) in tetrahydrofuran (THF). It was found that ZnCSEBS/BVP blend solutions exhibit enhanced viscosities and increasing hydrodynamic radii with narrowing distributions in solution, as well as improved glass transition temperature (Tg) of the ionomeric polystyrene (PS) blocks in bulk, which indicates complexation between ZnCSEBS and BVP chains. In contrast, ZnCSEP/BVP blends show viscosities and hydrodynamic radii close to the values calculated from the additivity law, and invariable Tg s of two blocks of ZnCSEP, suggesting that ZnCSEP can not form complexes with BVP. This architectural effect of the block ionomers on their complexation behavior has been interpreted in terms of the difference in structural characters of the associations of the diblock and triblock ionomers in solutions formed due to the aggregation of the ionic groups.

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Transition metal coordination for complexing polymer blends

Cited by 62 publications

References 0 publications

Morphology and cation local structure in a blend of copper‐neutralized carboxy‐terminated polybutadiene and poly(styrene‐co‐4‐vinylpyridine)

Morphology and cation local structure in a blend of copper‐neutralized carboxy‐terminated polybutadiene and poly(styrene‐co‐4‐vinylpyridine)

Reduction in domain size in polymer mixtures via charge transfer interactions

Intermacromolecular Complexation due to Specific Interactions, 14. The Chain Architectural Effect of Block Ionomers on Complexation

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