Linear polydimethylcarbosiloxanes with carboxyl groups in side radicals

Zhdanov, A. A.; Кашутина, Е. А.; Shchegolikhina, Olga I.

doi:10.1016/0032-3950(80)90052-0

Cited by 8 publications

(3 citation statements)

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“…In this way, they obtained polymers containing 1-5mol% carboxylic acid groups. 7 Upon heating, the initially liquidlike materials were found to transform into an elastomeric state. 8 Rheological investigations showed a decrease in the bulk-viscosity of the material upon heating to 70°C, and an increase in the bulk-viscosity at higher temperatures was suggested.…”

Section: Introductionmentioning

confidence: 99%

Reversible gelation of poly(dimethylsiloxane) with ionic and hydrogen-bonding substituents

Klok

Rebrov

Muzafarov

et al. 1999

J. Polym. Sci. B Polym. Phys.

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Section: Introductionmentioning

confidence: 99%

Reversible gelation of poly(dimethylsiloxane) with ionic and hydrogen-bonding substituents

Klok

Rebrov

Muzafarov

et al. 1999

J. Polym. Sci. B Polym. Phys.

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“…These schemes often result in high molecular weight but again suffer from random arrangement of ions. [23][24][25][26][27][28][29] Hydrolytic polycondensation to produce homopolymers consists of an acid-or base-catalyzed hydrolysis that converts difunctional monomers into cyclic oligomers, which are subsequently polymerized in the presence of ionic catalysts. [30][31][32][33] One advantage of such schemes is that the polymer has hydroxyl-terminated chains and hence can be further converted to vinyl-terminated chains and eventually cross-linked.…”

Section: Introductionmentioning

confidence: 99%

“…Cationic or anionic ring-opening copolymerization of cyclic siloxane oligomers bearing functional groups can also produce linear polysiloxanes with pendent ionic groups. These schemes often result in high molecular weight but again suffer from random arrangement of ions. − …”

Section: Introductionmentioning

confidence: 99%

Synthesis and Rheology of Tailored Poly(dimethylsiloxane) Zinc and Sodium Ionomers

2005

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We describe a synthesis scheme for the preparation of "model" poly(dimethylsiloxane) ionomers with tailored number of monomers between ions and number of ions per chain. Melts of low ion concentration (0.3-1.3 mol %) model zinc and cobalt ionomers, and their unneutralized COOH precursors are found to precipitate as polymers that flow and exhibit a zero-shear viscosity but equilibrate to physical gels. The gel time follows an Arrhenius relationship and is used to predict and verify physical gel formation at room temperature over a time scale from several months to years. The gel time depends chiefly on the ion concentration (calculated here as the average number of ions per monomer units (×100)) and functionality (defined as the average number of ions per chain); for ionomers with comparable overall molar mass, the ion concentration and functionality act counter to each other. Unlike traditional hydrocarbon ionomers, gel formation in these polysiloxane ionomers is favored by high temperature, and the gel moduli are comparable to moduli of end-linked PDMS networks. We propose this is due to transformation of intramolecular interactions to intermolecular interactions at high temperatures. Sodium ionomers form critical gels immediately after precipitation which we attribute to the more ionic nature of sodium relative to the transition-metal ionomers.

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Synthesis and thermal and rheological properties of carboxyl-containing polydimethylsiloxanes

et al. 2017

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Linear polydimethylcarbosiloxanes with carboxyl groups in side radicals

Cited by 8 publications

References 1 publication

Reversible gelation of poly(dimethylsiloxane) with ionic and hydrogen-bonding substituents

Reversible gelation of poly(dimethylsiloxane) with ionic and hydrogen-bonding substituents

Synthesis and Rheology of Tailored Poly(dimethylsiloxane) Zinc and Sodium Ionomers

Synthesis and thermal and rheological properties of carboxyl-containing polydimethylsiloxanes

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