Journal ArticleDOI
Infrared thermal analysis of polyurethane block polymers
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TLDR
In this article, the extent, distribution, and thermal behavior of hydorgen bonding in MDI-based segmented polyurethane elastomers were studied using infrared thermal analysis.Abstract:
Infrared (IR) thermal analysis was used to study the extent, distribution, and the thermal behavior of hydorgen bonding in MDI-based segmented polyurethane elastomers. Two series of polyurethane elastomers were studied; one was based on a polytetrahydrofuran soft segment (ET series), while the second was based on a poly(tetramethylene adipate) soft segment (ES series). The hard segment in these materials was formed form p, p′-diphenylmethane diisocyanate (MDI) extended with butanediol. Bonded and free NH and C=O infrared absorbances were resolved as a function of temperature using a nonlinear least squares analysis for the fitting of Gaussian curve shapes. Results of this analysis revealed that at room temperature, about 80% of the NH groups in the ET and ES polyurethanes formed hydrogen bonds. In the ET polyurethanes, about 65% of the urethane carbonyls were hydrogen-bonded at room temperature. The extent of interurethane hydrogen bonding was found to be higher in the materials having better pha...read more
Citations
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Soybean-oil-based waterborne polyurethane dispersions: effects of polyol functionality and hard segment content on properties.
Yongshang Lu,Richard C. Larock +1 more
TL;DR: Novel environmentally friendly biobased SPU materials with promising applications as decorative and protective coatings are reported, addressing concerns regarding gelation and higher cross-linking caused by the high functionality of vegetable-oil-based polyols.
Journal ArticleDOI
Fourier Transform Infrared Spectroscopy Study on Effects of Temperature on Hydrogen Bonding in Amine-Containing Polyurethanes and Poly(urethane−urea)s
TL;DR: In this article, the hydrogen bonding in hard and soft segments was examined for the extent of phase separation, and the microstructure was evidenced by differential scanning calorimetry (DSC).
Journal ArticleDOI
FT-IR and XPS studies of polyurethane-urea-imide coatings
TL;DR: In this article, a series of polyurethane (PU)-urea-imide coatings were synthesized by a systematic three-step reaction process, and the obtained polymers were analyzed with Fourier transform-infrared (FT-IR) and angle resolved X-ray photoelectron spectroscopy (AR-XPS).
Journal ArticleDOI
Selected topics in biomedical polyurethanes. A review
TL;DR: The literature on biomedical polyurethanes is reviewed in this article, with a focus on chemistry, structure-property relations, tissue-material interactions, surface properties, applications, processing, and sterilization.
Journal ArticleDOI
Microphase separation and rheological properties of polyurethane melts. 1. Effect of block length
Sachin Velankar,Stuart L. Cooper +1 more
TL;DR: In this article, a series of polyesterurethanes with differing block length and constant composition have been synthesized for rheological studies, and temperature-resolved SAXS experiments demonstrated gradual microphase mixing of the microphase-separated materials as the temperature increased.
References
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Journal ArticleDOI
Self Modeling Curve Resolution
TL;DR: In this paper, a method for determining the shapes of two overlapping functions f 1 (x) and f 2(x) from an observed set of additive mixtures is presented.
Journal ArticleDOI
Thermal Analysis of Polyurethane Block Polymers
R. W. Seymour,Stuart L. Cooper +1 more
Journal ArticleDOI
Infrared Studies of Segmented Polyurethan Elastomers. I. Hydrogen Bonding
Journal ArticleDOI
X-ray investigations concerning the physical structure of cross-linking in segmented urethane elastomers
TL;DR: In the X-ray diagrams of some segmented urethane elastomers, hard-segment interferences can be observed which indicate a defined geometrical accumulation of the hard segments as discussed by the authors.