Infrared Spectroscopic Studies of Poly(styrene- co -methacrylic acid) Blends with Polytetrahydrofuran

The miscibility or complexation of poly(styrene-co-acrylic acid) containing 27 mol % of acrylic acid (SAA-27) and poly(styrene-co-N,N-dimethylacrylamide) containing 17 or 32 mol % of N,N-dimethylacrylamide (SAD-17, SAD-32) or poly(N,N-dimethylacrylamide) (PDMA) were investigated by different techniques. The differential scanning calorimetry (DSC) analysis showed that a single glasstransition temperature was observed for all the mixtures prepared from tetrahydrofuran (THF) or butan-2-one. This is an evidence of their miscibility or complexation over the entire composition range. As the content of the basic constituent increases as within SAA-27/SAD-32 and SAA-27/PDMA, higher number of specific interpolymer interactins occurred and led to the formation of interpolymer complexes in butan-2-one. The qualitative Fourier transform infrared (FTIR) spectroscopy study carried out for SAA-27/SAD-17 blends re-vealed that hydrogen bonding occurred between the hydroxyl groups of SAA-27 and the carbonyl amide of SAD-17. Quantitative analysis carried out in the 160-2108C temperature range for the SAA-27 copolymer and its blends of different ratios using the Painter-Coleman association model led to the estimation of the equilibrium constants K 2 , K A and the enthalpies of hydrogen bond formation. These blends are miscible even at 1808C as confirmed from the negative values of the total free energy of mixing DG M over the entire blend composition.

Section: Resultssupporting

confidence: 86%

Interpolymer‐specific interactions and miscibility in poly(styrene‐co‐acrylic acid)/poly(styrene‐co‐N,N‐dimethylacrylamide) blends

Hadj‐Hamou

Djadoun

2006

“…In order to give a detailed description to the interaction between Fe‐OCAP and PU, the temperature dependence of hydrogen bond for Fe‐OCAP/PU blends should be investigated. Since Fourier transform infrared (FTIR) is very sensitive to hydrogen bond, this technique has been applied to the characterization of hydrogen bond in PU in a wide range of studies . Chen et al prepared a pyridine containing PU.…”

Section: Introductionmentioning

confidence: 99%

Temperature dependence of hydrogen bond in Fe‐OCAP/polyurethane blends

Chen

2013

Fourier transform infrared (FTIR) thermal analysis was utilized to study the temperature dependence of hydrogen bond in Fe-octacarboxyl acid phthalocyanine (Fe-OCAP)/polyurethane (PU) blends. Two regions in the FTIR spectra were concerned to investigate the difference of the degree of hydrogen bond in the samples: the ANH stretching region (3210-3460 cm 21 ) and carbonyl stretching region (1680-1760 cm 21 ). It was found that the average strength of hydrogen bond in the modified samples was stronger than that in pure PU. With increasing Fe-OCAP content, the hydrogen bonded ANH and carbonyl groups were increased, while with increasing temperature they decreased. The equilibrium between free and hydrogen bonded carbonyl groups was discussed. The dissociation enthalpy for hydrogen bonded carbonyl of the samples was increased with increasing Fe-OCAP content.

“…It was shown that the three IR spectra were almost the same. However, differences were showed up when we magnified the carbonyl stretching region, which could reflect the hard‐hard segments hydrogen bond of PU, namely hydrogen bonded carbonyls (NH

\dots

OC bond) of PU, as shown in Figure . Peaks centered near 1734 cm −1 and 1706 cm −1 were assigned to the stretching of free and hydrogen bonded carbonyl groups, respectively.…”

Section: Resultsmentioning

confidence: 99%

Preparation and characterization of Fe‐Tetranitro phthalocyanine/polyurethane blends

Chen

2014

In this article, Fe-Tetranitro phthalocyanine (Fe-TNPc)/polyurethane (PU) blends were prepared by solution blending. The mechanical properties of the samples were studied by tensile tests. The results showed that the tensile strength and the elongation at break of the samples increased with increasing Fe-TNPc content. The improved mechanical properties for the samples containing Fe-TNPc was attributed to the increased microphase separation degree of PU, which was further investigated by dynamic mechanical analysis (DMA) and Fourier transform infrared analysis. The lower T g of the soft segments and the higher T g of the hard segments for the samples containing Fe-TNPc indicated an increase of microphase separation degree of PU. The increased hydrogen bonded carbonyl groups in the samples with increasing Fe-TNPc content also proved the conclusion. Quantitative evaluation of the interaction between Fe-TNPc and PU was also investigated by analyzing the physical crosslinking density of the samples. The results indicated that the physical crosslinking density of the samples increased with increasing Fe-TNPc content. The antibacterial properties of the samples were investigated. The results showed that the percentage bacterial inactivation toward S. aureus and E. coli of the samples were 98.9% and 90.9%, respectively, when Fe-TNPc was added to 1%.