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Synthesis and characterisation of coating polyurethane cationomers containing fluorine built-in hard urethane segments.

Król B, Król P, Pikus S, Chmielarz P, Skrzypiec K - Colloid Polym Sci (2010)

Bottom Line: Changes were discussed in the surface free energy and its components, as calculated independently according to the method suggested by van Oss-Good, in relation to chemical and physical structures of cationomers as well as morphology of coating surfaces obtained from those cationomers.Fluorine incorporated into cationomers (about 30%) contributed to lower surface free energy values, down to about 15 mJ/m(2).That was caused by gradual weakening of long-range interactions within which the highest share is taken by dispersion interactions.

View Article: PubMed Central - PubMed

ABSTRACT
Polyurethane cationomers were synthesised in the reaction of 4,4'-methylenebis(phenyl isocyanate) with polyoxyethylene glycol (M = 2,000) or poly(tetrafluoroethyleneoxide-co-difluoromethylene oxide) α,ω-diisocyanate and N-methyl diethanolamine. Amine segments were built-in to the urethane-isocyanate prepolymer in the reaction with 1-bromobutane or formic acid, and then they were converted to alkylammonium cations. The obtained isocyanate prepolymers were then extended in the aqueous medium that yielded stable aqueous dispersions which were applied on the surfaces of test poly(tetrafluoroethylene) plates. After evaporation of water, the dispersions formed thin polymer coatings. (1)H, (13)C NMR and IR spectral methods were employed to confirm chemical structures of synthesised cationomers. Based on (1)H NMR and IR spectra, the factors κ and α were calculated, which represented the polarity level of the obtained cationomers. The DSC, wide angle X-ray scattering and atom force microscopy methods were employed for the microstructural assessment of the obtained materials. Changes were discussed in the surface free energy and its components, as calculated independently according to the method suggested by van Oss-Good, in relation to chemical and physical structures of cationomers as well as morphology of coating surfaces obtained from those cationomers. Fluorine incorporated into cationomers (about 30%) contributed to lower surface free energy values, down to about 15 mJ/m(2). That was caused by gradual weakening of long-range interactions within which the highest share is taken by dispersion interactions.

No MeSH data available.


WAXS diffraction pattern for cationomers nos. 2 and 4
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Fig5: WAXS diffraction pattern for cationomers nos. 2 and 4

Mentions: Supermolecular ordering of investigated cationomers was analysed by means of the WAXS method. X-ray diffraction patterns for two cationomers nos. 2 and 4 were shown in Fig. 5. As can be seen from that figure, the X-ray diffraction patterns for both samples show one broad peak which originates from amorphous structures of investigated cationomers. It is worth to notice that these broad peaks have maxima at different values of 2θ, which suggests differences in the structural arrangements of cationomers nos. 2 and 4. Adding to broad peaks in Fig. 5, one sharp peak is visible for both samples close to 2θ equal to about 30°. It means that both samples contain small amounts of crystallites. Theoretically, those crystallites could be formed by organic monomers or by inorganic compounds (NaCl or KCl) which were added when prepolymer PF was synthesised. That last suggestion is much more credible. In Fig. 5 for cationomer no. 4, two small but distinct peaks are visible in a small range of 2θ. The presence of these peaks and a smaller value of full width in half maximum of the amorphous peak for the sample no. 4 than for the sample no. 2 are indicative for a better ordered structure in the first sample.Fig. 5


Synthesis and characterisation of coating polyurethane cationomers containing fluorine built-in hard urethane segments.

Król B, Król P, Pikus S, Chmielarz P, Skrzypiec K - Colloid Polym Sci (2010)

WAXS diffraction pattern for cationomers nos. 2 and 4
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC2927047&req=5

Fig5: WAXS diffraction pattern for cationomers nos. 2 and 4
Mentions: Supermolecular ordering of investigated cationomers was analysed by means of the WAXS method. X-ray diffraction patterns for two cationomers nos. 2 and 4 were shown in Fig. 5. As can be seen from that figure, the X-ray diffraction patterns for both samples show one broad peak which originates from amorphous structures of investigated cationomers. It is worth to notice that these broad peaks have maxima at different values of 2θ, which suggests differences in the structural arrangements of cationomers nos. 2 and 4. Adding to broad peaks in Fig. 5, one sharp peak is visible for both samples close to 2θ equal to about 30°. It means that both samples contain small amounts of crystallites. Theoretically, those crystallites could be formed by organic monomers or by inorganic compounds (NaCl or KCl) which were added when prepolymer PF was synthesised. That last suggestion is much more credible. In Fig. 5 for cationomer no. 4, two small but distinct peaks are visible in a small range of 2θ. The presence of these peaks and a smaller value of full width in half maximum of the amorphous peak for the sample no. 4 than for the sample no. 2 are indicative for a better ordered structure in the first sample.Fig. 5

Bottom Line: Changes were discussed in the surface free energy and its components, as calculated independently according to the method suggested by van Oss-Good, in relation to chemical and physical structures of cationomers as well as morphology of coating surfaces obtained from those cationomers.Fluorine incorporated into cationomers (about 30%) contributed to lower surface free energy values, down to about 15 mJ/m(2).That was caused by gradual weakening of long-range interactions within which the highest share is taken by dispersion interactions.

View Article: PubMed Central - PubMed

ABSTRACT
Polyurethane cationomers were synthesised in the reaction of 4,4'-methylenebis(phenyl isocyanate) with polyoxyethylene glycol (M = 2,000) or poly(tetrafluoroethyleneoxide-co-difluoromethylene oxide) α,ω-diisocyanate and N-methyl diethanolamine. Amine segments were built-in to the urethane-isocyanate prepolymer in the reaction with 1-bromobutane or formic acid, and then they were converted to alkylammonium cations. The obtained isocyanate prepolymers were then extended in the aqueous medium that yielded stable aqueous dispersions which were applied on the surfaces of test poly(tetrafluoroethylene) plates. After evaporation of water, the dispersions formed thin polymer coatings. (1)H, (13)C NMR and IR spectral methods were employed to confirm chemical structures of synthesised cationomers. Based on (1)H NMR and IR spectra, the factors κ and α were calculated, which represented the polarity level of the obtained cationomers. The DSC, wide angle X-ray scattering and atom force microscopy methods were employed for the microstructural assessment of the obtained materials. Changes were discussed in the surface free energy and its components, as calculated independently according to the method suggested by van Oss-Good, in relation to chemical and physical structures of cationomers as well as morphology of coating surfaces obtained from those cationomers. Fluorine incorporated into cationomers (about 30%) contributed to lower surface free energy values, down to about 15 mJ/m(2). That was caused by gradual weakening of long-range interactions within which the highest share is taken by dispersion interactions.

No MeSH data available.