Adhesion and Tribological Characteristics of Ion‐Containing Polymer Brushes Prepared by Controlled Radical Polymerization

Kobayashi, Motoyasu; Ishikawa, Tatsuya; Takahara, Atsushi

doi:10.1002/9781118505175.ch2

Cited by 2 publications

(1 citation statement)

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“…The prevalence of ion-containing polymers in both traditional and emerging applications enables widespread use in water-purification membranes, drug delivery agents, and conductive materials. − Significant research into novel, ion-containing monomers and novel combinations of established monomers generates a large family of polymers for these high impact applications. , Incorporation of charge into a variety of polymer backbones permits tailoring of polymeric structures to address specific needs . For example, Gao et al synthesized charged poly(ethylene glycol) (PEG)-based polyurethanes, which displayed drastically different mechanical properties when compared to inclusion of charge into PEG-based ammonium ionenes. , The presence of ions dramatically influences mechanical properties compared to neutral analogues.…”

Section: Introductionmentioning

confidence: 99%

Poly(ether ester) Ionomers as Water-Soluble Polymers for Material Extrusion Additive Manufacturing Processes

Pekkanen

Zawaski

Stevenson

et al. 2017

ACS Appl. Mater. Interfaces

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Water-soluble polymers as sacrificial supports for additive manufacturing (AM) facilitate complex features in printed objects. Few water-soluble polymers beyond poly(vinyl alcohol) enable material extrusion AM. In this work, charged poly(ether ester)s with tailored rheological and mechanical properties serve as novel materials for extrusion-based AM at low temperatures. Melt transesterification of poly(ethylene glycol) (PEG, 8k) and dimethyl 5-sulfoisophthalate afforded poly(ether ester)s of sufficient molecular weight to impart mechanical integrity. Quantitative ion exchange provided a library of poly(ether ester)s with varying counterions, including both monovalent and divalent cations. Dynamic mechanical and tensile analysis revealed an insignificant difference in mechanical properties for these polymers below the melting temperature, suggesting an insignificant change in final part properties. Rheological analysis, however, revealed the advantageous effect of divalent countercations (Ca, Mg, and Zn) in the melt state and exhibited an increase in viscosity of two orders of magnitude. Furthermore, time-temperature superposition identified an elevation in modulus, melt viscosity, and flow activation energy, suggesting intramolecular interactions between polymer chains and a higher apparent molecular weight. In particular, extrusion of poly(PEG-co-CaSIP) revealed vast opportunities for extrusion AM of well-defined parts. The unique melt rheological properties highlighted these poly(ether ester) ionomers as ideal candidates for low-temperature material extrusion additive manufacturing of water-soluble parts.

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