Effect of difunctional acids on the physicochemical, thermal, and mechanical properties of polyester polyol‐based polyurethane coatings

Xu, Wen Cai; Zhou, Lipan; Sun, Weifu; Zhang, Junrui; Wei-ping, TU

doi:10.1002/app.41246

Cited by 8 publications

(5 citation statements)

References 42 publications

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“…Results from these tests are shown in Figure , in which the temperature dependence of the dynamic storage and loss moduli ( E ′ in Figure a and E ″ in Figure b, respectively) is provided as a function of TMCD loading. All the HB resins possess a similar value of E ′ (≈2 GPa) in the glassy state (the minimum T g from DSC in Figure is ≈50 °C), which is expected − for thermosetting polymers in this state. As the temperature is increased, each resin exhibits a precipitous (nearly 3-decade) reduction in E ′ as the specimen transitions from its glassy to rubbery state.…”

Section: Results and Discussionmentioning

confidence: 54%

Thermomechanical and Free-Volume Properties of Polyester–Polyol Films for Coatings Applications: Role of Diol Composition

Tilly¹,

Pervaje²,

Inglefield

et al. 2019

ACS Appl. Polym. Mater.

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Because of their utility in diverse coatings applications, a model series of polyester–polyol films possessing different diol formulations and cross-linked with an aliphatic isocyanate cross-linker under two different conditions is systematically investigated to elucidate the effects of backbone chemistry and cure temperature on the ultimate thermomechanical and free-volume properties. The diol of particular interest in this study is 2,2,4,4-tetramethyl-1,3-cyclobutanediol (TMCD). The glass transition temperature of the films, as measured by thermal calorimetry and dynamic mechanical analysis, is observed to correlate strongly with TMCD content. In the limit of 100 wt % TMCD diol, the operable temperature range for these films increases by as much as ∼60 °C. Surface mechanical properties, interrogated by nanoindentation, also depend sensitively on both TMCD content and cure conditions, and a previously reported phenomenon known as “pileup” is considered to explain some of our observations. Results from positron annihilation lifetime spectroscopy indicate that the nanoscopic free volume of films containing varying levels of TMCD is strongly dependent on chemical makeup but not on cure conditions.

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Section: Results and Discussionmentioning

confidence: 54%

Thermomechanical and Free-Volume Properties of Polyester–Polyol Films for Coatings Applications: Role of Diol Composition

Tilly¹,

Pervaje²,

Inglefield

et al. 2019

ACS Appl. Polym. Mater.

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“…The most common polyester polyols are adipate polyols produced from the polyesterification reaction of adipic acid with short chain diols . Structure–property relationships of polyester polyols prepared from one or mixture of dicarboxylic acids and with different diols have been extensively evaluated …”

Section: Introductionmentioning

confidence: 99%

Oscillatory structure–property correlation in azelate polyols and thermoplastic polyurethanes

Ismail

Ibrahim

Sendijarevic

et al. 2018

J of Applied Polymer Sci

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Azelate polyols of 2000 g mol−1 have been successfully prepared via esterification of renewable azelaic acid with linear diols containing different number of CH2 repeating units. Structure–property correlation of the azelate polyols had been evaluated in thermoplastic polyurethanes (TPUs). TPUs based on azelate polyols of longer chained linear diols with >4 CH2 repeat units retained higher degrees of crystallinity associated with the polyol soft segment. The ratio of hydrogen bonded urethane in the hard segment to free urethane phase mixed with the soft segment in the TPUs showed a complex oscillating dependence with increased number of CH2 repeating unit in the linear diols of azelate polyols. Correspondingly, static and dynamic properties of TPUs also showed the oscillatory dependence, whereby dynamic properties maximized with odd number of CH2 repeating unit and material strength maximized with even number of CH2 repeating unit. The results therefore can be used as guide to select appropriate azelate polyols to target specific TPU performance. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46258.

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“…The monomers incorporated in these resins included neopentyl glycol (N), trimethylolpropane (T), isophthalic acid (I), and 1,4-cyclohexanedicarboxylic acid (C). These monomers, commonly used in the production of polyester polyols, were selected because of their commercial relevance and the valuable thermomechanical properties they impart to their corresponding polymers. , A chemical depiction of these monomers, as well as the overall polyester polyol polycondensation (step-growth polymerization) synthesis scheme, is presented in Figure . The four polyester–polyol resins are designated by a resin number (PP1 to PP4), followed by the single-letter abbreviations included in Figure of the specific monomers incorporated: PP1NI, PP2NTI, PP3NIC, and PP4NTIC.…”

Section: Methodsmentioning

confidence: 99%

“…Polymers synthesized from a variety of monomer species in specific combinations yield a wide range of thermomechanical properties. Modifying the chemical makeup and structure of polymers enables tunable properties. − Polyester polyols constitute a technologically significant family of macromolecules that possess an assortment of chemical structures. Generally speaking, they contain multiple ester bonds along their backbone and are terminated by hydroxyl groups.…”

Section: Introductionmentioning

confidence: 99%

Modeling Polymer Glass Transition Properties from Empirical Monomer Data with the SAFT-γ Mie Force Field

et al. 2018

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We apply a recently developed coarse-graining method to build models for polyester polyols, versatile polymers with applications in coatings, by combining models for the component monomers. This strategy employs the corresponding states correlation to the group-contribution SAFT-γ Mie equation of state [Mejia, A.; et al. Ind. Eng. Chem. Res. 2014, 53, 4131–4141] to obtain force-field parameters for the constituent monomer species. Results from simulations agree favorably with experimental values of mass density, glass transition temperature (T g), and specific heat capacity change at T g. Further simulations over a range of Mie parameters and polymer chemical compositions yield a correlation that relates the parameters directly to T g. This correlation is validated by experimental data and can be used as a predictive tool within the tested parameter space to expedite the design of these coating materials.

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Effect of difunctional acids on the physicochemical, thermal, and mechanical properties of polyester polyol‐based polyurethane coatings

Cited by 8 publications

References 42 publications

Thermomechanical and Free-Volume Properties of Polyester–Polyol Films for Coatings Applications: Role of Diol Composition

Thermomechanical and Free-Volume Properties of Polyester–Polyol Films for Coatings Applications: Role of Diol Composition

Oscillatory structure–property correlation in azelate polyols and thermoplastic polyurethanes

Modeling Polymer Glass Transition Properties from Empirical Monomer Data with the SAFT-γ Mie Force Field

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