Novel phenyl‐POSS/polyurethane aqueous dispersions and their hybrid coatings

Hu, Jiankun; Li, Lian; Zhang, Siwei; Gong, Liutang; Gong, Shuling

doi:10.1002/app.39303

Cited by 12 publications

(7 citation statements)

References 47 publications

(57 reference statements)

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“…Figure shows the XRD pattern of the samples PU‐1 to PU‐7. It reveals that there is a 2θ diffraction peak at approximately 20°, which is in reasonable agreement with the reported value of PU elsewhere . The intensity of this peak gradually decreases from samples PU‐1 to PU‐5, followed by a reverse increase from PU‐6 to PU‐7.…”

Section: Resultssupporting

confidence: 90%

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

Zhou

Sun

et al. 2014

J of Applied Polymer Sci

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Polyester polyol (PP)-based polyurethanes (PUs) consisting of two difunctional acids [1,4-cyclohexanedicarboxylic acid (CHDA) and 1,6-adipic acid (AA)] and also two diols [1,4-cyclohexanedimethanol (CHDM) and 1,6-hexanediol (HDO)] were synthesized by a two-step procedure with a variable feed ratio of CHDA to AA but fixed ratio of CHDM and HDO. The prepared PPs and/or PUs were characterized by Fourier transform infrared spectroscopy, X-ray diffraction spectroscopy, and atomic force microscopy. The effects of difunctional acids on the thermal, mechanical, and dynamic mechanical thermal properties of PPs or PU films were investigated by thermogravimetry analysis, differential thermogravimetry and dynamic mechanical thermal analysis. The results show that PP exhibits a lowest viscosity with the mole fraction of CHDA and AA at 3 : 7 whereas it delivers a lowest melting point with the mole fraction at 9 : 1. After PPs being cross-linked by isocyanate trimers, the impact resistance, shear strength and glass transition temperature increase the mixed-acid formulations with increasing the content of CHDA. In detail, the resultant PU almost simultaneously exhibits the best mechanical and thermal properties when the mole fraction of CHDA and AA is kept constant at 9 : 1, thus giving rise to a high glass transition temperature of 56.4 C and a onset decomposition temperature of 350 C, and also delivering a balanced toughness and hardness with an impact resistance of 100 J/g and storage modulus as high as 10 9 Pa. This path for synthesis of PP-based PU provides a design tool for high performance polymer coatings.

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Section: Resultssupporting

confidence: 90%

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

Zhou

Sun

et al. 2014

J of Applied Polymer Sci

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“…That from 250 to 400°C could be attributed to the dissociation of urethane bonds to form isocyanates, alcohol, and amines. The decomposition above 400°C was mainly due to the dissociation of the soft segments in the polyurethane and POSS cage structure . As the POSS content increased, the first decomposition temperature was slightly increased, and the second decomposition temperature obviously increased, which meant that the POSS particles were good to the thermal stability of the polyurethane.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of waterborne polyurethane/polyhedral oligomeric silsesquioxane composites with low dielectric constants

Zhao

et al. 2019

Polymers for Advanced Techs

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A facile method was developed to synthesize a new type of polyhedral oligomeric silsesquioxane (POSS). It contained a single amine group and seven aliphatic moieties on its corners. FT-IR, 1 H-NMR, 13 C-NMR, 13 C-1 H COSY, and 1 H-1 H COSY confirmed that cages with eight corners were the main part of the product. This new POSS was used to modify the structure of hexamethylene diisocyanate trimer and then copolymerized with hexamethylene diisocyanate and poly (tetramethylene glycol) to get a serious of waterborne polyurethane (WPU)/POSS hybrid materials with low dielectric constants for microelectronics applications. The results showed that POSS particles were uniformly dispersed in the WPU dispersions. The WPU/POSS films did not show any macrophase separation, even when the POSS content was as high as 16%. As the POSS content increased from 0% to 16%, the tensile strength was increased from 2.3 to 7.3 MPa, the dielectric constant was decreased from about 2.9 to 2.0, and the thermal stability of the WPU/POSS was also improved.

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“…[29][30][31] Various substituents were introduced to the three silanole groups at the opening moiety ["X" in Chart 1(b)], and the composite films of PMMA with the synthesized IC-POSS fillers were fabricated. Herein, we have demonstrated that IC-POSS fillers are effectively dispersed in a PMMA matrix.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of composite films with poly(methyl methacrylate) and incompletely condensed cage‐silsesquioxane fillers

Yuasa

Sato

Imoto

et al. 2017

J of Applied Polymer Sci

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Polyhedral oligomeric silsesquioxane (POSS) is a promising nanofiller for tuning properties of optically transparent polymer materials. On the other hand, traditional completely condensed POSS (CC-POSS) has a fundamental problem for fabricating optically transparent composite films; CC-POSS has high crystallinity due to its symmetrical structure, resulting in aggregation in the polymer matrices. In this work, we have demonstrated that incompletely-condensed POSS (IC-POSS), which has an open-cage structure, can be well dispersed in a poly(methyl methacrylate) (PMMA) matrix. IC-POSS with various substituents were readily synthesized, and their composite films of PMMA were fabricated by solution-casting method. High transparency was achieved with up to 30 wt % of the IC-POSS fillers, while the CC-POSS analogues caused phase separation with 10 wt % loading. Addition of the IC-POSS fillers can improve thermal stability and control glass transition temperature by the substituent structure. Additionally, refractive index was tuned from 1.485 to 1.513.

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Novel phenyl‐POSS/polyurethane aqueous dispersions and their hybrid coatings

Cited by 12 publications

References 47 publications

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

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

Synthesis and characterization of waterborne polyurethane/polyhedral oligomeric silsesquioxane composites with low dielectric constants

Fabrication of composite films with poly(methyl methacrylate) and incompletely condensed cage‐silsesquioxane fillers

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