Clustering in carboxylated polysulfone ionomers: A characterization by dynamic mechanical and small-angle X-ray scattering methods

Nguyen, Diep; Kim, Joon‐Seop; Guiver, Michael D.; Eisenberg, Adi

doi:10.1002/(sici)1099-0488(19991115)37:22<3226::aid-polb7>3.0.co;2-m

Cited by 11 publications

(5 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A reason for this is that sulfonic groups are statistically attached to the main chain of poly(ether ether ketone). Furthermore, Guiver et al29 suggested that the rigid nature of the polymer matrix would preclude clustering and further phase‐separation processes. A quite different case is observed for polymers such as Nafion, in which the sulfonic group is attached to the polymer side chain; this makes the clustering of ionic groups easier.…”

Section: Resultsmentioning

confidence: 99%

Anomalous small‐angle X‐ray scattering characterization of composites based on sulfonated poly(ether ether ketone), zirconium phosphates, and zirconium oxide

Prado

Wittich

Schulte

et al. 2003

J Polym Sci B Polym Phys

View full text Add to dashboard Cite

The morphology and distribution of zirconium oxide and zirconium phosphates in a matrix of sulfonated poly(ether ether ketone) (SPEEK) were investigated with anomalous small‐angle X‐ray scattering (ASAXS) and electron microscopy. ASAXS revealed that ZrO2 was distributed in the SPEEK matrix in the form of nanoparticles smaller than 13 Å. A decrease in the conductivity suggested that the sulfonic groups were bound to the zirconium oxo species at the particle surface. Furthermore, two kinds of membranes containing zirconium phosphate were investigated. In one case, the phosphate was directly dispersed in the polymer solution for the casting of the membrane. In the other case, the phosphate was previously treated with n‐propyl ammonium and polybenzimidazole. From ASAXS data, the fractal dimension could be estimated. Mass‐fractal behavior was confirmed for the SPEEK membrane containing previously exfoliated zirconium phosphate, with aggregates of 6.3–165 Å. Surface‐fractal behavior was detected for membranes with untreated phosphates, with aggregates of 6.4–185 Å. The untreated phosphates caused an increase in the permeability, without changing the proton conductivity much. © 2003 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 42: 567–575, 2004

show abstract

Section: Resultsmentioning

confidence: 99%

Anomalous small‐angle X‐ray scattering characterization of composites based on sulfonated poly(ether ether ketone), zirconium phosphates, and zirconium oxide

Prado

Wittich

Schulte

et al. 2003

J Polym Sci B Polym Phys

View full text Add to dashboard Cite

show abstract

“…Nguyen et al41 recently reported that T g corresponding to the individual components of inhomogeneous polymers can be determined by the deconvolution of the tan δ curve. The deconvoluted tan δ curves for 30 wt % HMMM clearcoats baked under cure conditions A–D are shown in Figure 11, and the ratio of self‐condensed networks to cocondensed networks and the corresponding T g 's for HMMM/polyester clearcoat IPNs are given in Table 4.…”

Section: Resultsmentioning

confidence: 99%

Thermal characterization of polyester–melamine coating matrices prepared under nonisothermal conditions

Gamage

Hill

Lukey

et al. 2003

J. Polym. Sci. A Polym. Chem.

View full text Add to dashboard Cite

Thermal analysis methods (differential scanning calorimetry, thermogravimetric analysis, and dynamic mechanical thermal analysis) were used to characterize the nature of polyester-melamine coating matrices prepared under nonisothermal, high-temperature, rapid-cure conditions. The results were interpreted in terms of the formation of two interpenetrating networks with different glass-transition temperatures (a cocondensed polyester-melamine network and a self-condensed melaminemelamine network), a phenomenon not generally seen in chemically similar, isothermally cured matrices. The self-condensed network manifested at high melamine levels, but the relative concentrations of the two networks were critically dependent on the cure conditions. The optimal cure (defined in terms of the attainment of a peak metal temperature) was achieved at different oven temperatures and different oven dwell times, and so the actual energy absorbed varied over a wide range. Careful control of the energy absorption, by the selection of appropriate cure conditions, controlled the relative concentrations of the two networks and, therefore, the flexibility and hardness of the resultant coatings.

show abstract

“…Eisenberg and Rinaudo [1] proposed that OPEN ACCESS the bulk properties of ionomers are governed by ionic interactions taking place in discrete regions of the material. In the recent decades, ionomers have been extensively investigated to examine their unique characteristic ionic aggregation as responsible for significant changes in physical properties such as glass-transition temperature, mechanical behavior, transport of gases, and melt viscosity [2][3][4][5][6]. According to the Eisenberg-Hird-Moore model, at increasing ionic concentrations, the aggregates (multiplets) start to overlap to form the so-called clusters [7,8].…”

Section: Introductionmentioning

confidence: 99%

Poly(butylene succinate) Ionomers with Enhanced Hydrodegradability

et al. 2015

View full text Add to dashboard Cite

A series of poly(butylene succinate) (PBS) ionomers containing up to 14 mol% of sulfonated succinate units have been synthesized by polycondensation in the melt-phase. The copolyesters were obtained with weight average molecular weights oscillating between 33,000 and 72,000 g·mol−1. All copolyesters were semicrystalline with melting temperatures and enthalpies decreasing and glass transition temperatures increasing with the content of ionic units. The thermal stability of PBS was slightly reduced by the incorporation of these units, and it was also found that the copolyesters were stiffer but also more brittle than PBS. The hydrolytic degradability of PBS was enhanced by copolymerization, an effect that was much more pronounced in basic media.

show abstract

Clustering in carboxylated polysulfone ionomers: A characterization by dynamic mechanical and small-angle X-ray scattering methods

Cited by 11 publications

References 12 publications

Anomalous small‐angle X‐ray scattering characterization of composites based on sulfonated poly(ether ether ketone), zirconium phosphates, and zirconium oxide

Anomalous small‐angle X‐ray scattering characterization of composites based on sulfonated poly(ether ether ketone), zirconium phosphates, and zirconium oxide

Thermal characterization of polyester–melamine coating matrices prepared under nonisothermal conditions

Poly(butylene succinate) Ionomers with Enhanced Hydrodegradability

Contact Info

Product

Resources

About