Mechanical properties of carboxylato-telechelic polyisoprene

Tant, Martin R.; Song, Joo H.; Wilkes, Garth L.; Horrion, J.; Jérôme, Robert

doi:10.1016/0032-3861(86)90281-8

Cited by 11 publications

(10 citation statements)

References 37 publications

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“…Influences of molecular weight in telechelic ionomers have also been studied. − Telechelic ionomers contain two ionic groups per chain, placed at either end of the polymer chain. The effects of changing molecular weight are more complicated in these systems because varying the molecular weight in a telechelic ionomer also changes the ion content.…”

Section: Introductionmentioning

confidence: 99%

Morphological Studies of Lightly Sulfonated Polystyrene Using ²³Na NMR: Effects of Polydispersity in Molecular Weight

et al. 1996

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Ion content and molecular weight have been shown to affect the 23Na NMR spectra of monodisperse sodium-neutralized sulfonated polystyrene ionomers (MNaSPS). A new NMR peak at −2.7 ppm appears at ionization levels above 1.2% and molecular weights of a least 35 000; this peak is not present in polydisperse NaSPS. The fraction of NMR intensity due to this peak is relatively constant above M n ∼ 100 000. It is proposed that this peak is due to a distorted version of an isolated site. Along with the new −2.7 ppm peak, the monodisperse materials also have far fewer isolated ions than the corresponding polydisperse ionomers. It is possible that the greater chain uniformity of the monodisperse ionomers eliminates plasticization of the aggregates by the low molecular weight components and steric hindrances from the high molecular weight components and permits more complete aggregation of the ionic groups. The new NMR peak can be removed by casting from a cosolvent of THF/water, but not by casting from THF/methanol. Blending of two or more monodisperse materials in solution followed by annealing resulted in an NMR spectrum similar to that of a polydisperse material; however, the behavior of the blend without annealing did not replicate that of polydisperse NaSPS.

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Section: Introductionmentioning

confidence: 99%

Morphological Studies of Lightly Sulfonated Polystyrene Using ²³Na NMR: Effects of Polydispersity in Molecular Weight

et al. 1996

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“…A number of papers have reported on the morphology and properties of HTP's. [26][27][28][29][30][31][32][33][34] An extensive study of carboxylato-telechelic polymers has shown that, in a solvent of low dielectric constant, gelation can take place at a polymer concentration as low as 1 or 2 wt %. However, gelation depends on temperature, on the dielectric constant of the solvent, and on the size and charge of the cation.6•9 Dynamic mechanical measurements have been performed on gels of , -dicarboxylatopolyisoprene and -polybutadiene.…”

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confidence: 99%

Viscoelastic properties of telechelic ionomers. 2. Quaternized α,ι-bis(dimethylamino)polyisoprene

et al. 1992

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A short-length polyisoprene (Mn = 5000) was selectively end-capped at both ends by a dimethylamino group. Quaternization of these end groups by a series of n-alkyl iodides deeply affected the dynamic mechanical behavior. The glass transition temperature (T,) of polyisoprene and the storage modulus (GO in the glassy state were found to be largely dependent on the length of the n-alkyl group of the quaternization agent: both of these properties increased as the n-alkyl group was shortened. Furthermore, as a result of the quaternization of the tertiary amine end groups a rubbery plateau emerged in the isochronous curves of G' vs temperature. An ionic relaxation peak was also displayed by the thermal dependence of the loss modulus (G"), in a range depending on the length of the n-alkyl group and on the functionality of the quaternization agent.

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“…Several studies have probed the structure-property relationships of these i~nomers. '~-'~ Tant et al 15 examined the tensile properties of A13+, Ba2+, and Zr4+ salts of carboxy-telechelic polyisoprenes over the molecular weight range 15,000 to 45,000, and concluded that both the cation and the molecular weight played important roles in the materials' behavior. By changing the molecular weight of the telechelic backbone the investigators were able to conveniently vary the ion content while retaining a known molecular architecture.…”

Section: Introductionmentioning

confidence: 99%

Structure—property relationships of polyurethane ionomers with star chain architecture

Thompson¹,

Yu²,

Cooper³

1990

J of Applied Polymer Sci

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SynopsisThe effects of chain architecture, polyol chemistry and polyol molecular weight on the properties of elastomeric polyurethane ionomers were investigated. The type of polyol and its molecular weight had a strong influence on the rubbery modulus and tensile properties. Variations in chain architecture showed little impact on mechanical and thermal properties. Linear ionomers, threearm ionomers, and six-arm ionomers had similar mechanical and thermal behavior.

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Mechanical properties of carboxylato-telechelic polyisoprene

Cited by 11 publications

References 37 publications

Morphological Studies of Lightly Sulfonated Polystyrene Using ²³Na NMR: Effects of Polydispersity in Molecular Weight

Morphological Studies of Lightly Sulfonated Polystyrene Using ²³Na NMR: Effects of Polydispersity in Molecular Weight

Viscoelastic properties of telechelic ionomers. 2. Quaternized α,ι-bis(dimethylamino)polyisoprene

Structure—property relationships of polyurethane ionomers with star chain architecture

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Mechanical properties of carboxylato-telechelic polyisoprene

Cited by 11 publications

References 37 publications

Morphological Studies of Lightly Sulfonated Polystyrene Using 23Na NMR: Effects of Polydispersity in Molecular Weight

Morphological Studies of Lightly Sulfonated Polystyrene Using 23Na NMR: Effects of Polydispersity in Molecular Weight

Viscoelastic properties of telechelic ionomers. 2. Quaternized α,ι-bis(dimethylamino)polyisoprene

Structure—property relationships of polyurethane ionomers with star chain architecture

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Morphological Studies of Lightly Sulfonated Polystyrene Using ²³Na NMR: Effects of Polydispersity in Molecular Weight

Morphological Studies of Lightly Sulfonated Polystyrene Using ²³Na NMR: Effects of Polydispersity in Molecular Weight