Synthesis and characterization of novel polyurethanes based on 4-{(4-hydroxyphenyl)iminomethyl}phenol

Raghu, Anjanapura V.; Jeong, Han Mo; Kim, Jae-Hoon; Lee, Yu Rok; Cho, Youn Bok; Sirsalmath, Kiran T.

doi:10.1007/bf03218852

Cited by 54 publications

(28 citation statements)

References 35 publications

(23 reference statements)

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“…Beyond 300 • C, the different polyurethanes show somewhat different degradation behavior. The thermal stability trend of MDI > HDI > TDI is consistent with the data on other polyurethanes reported in the literature (Raghu et al, 2008;Wei, Cheng, Li, & Yu, 2009). Note that the TGA curves for microwave heated and conventionally heated ␤-CD/TDI and ␤-CD/HDI are similar.…”

Section: Thermogravimetric Analysis (Tga)supporting

confidence: 87%

Microwave-assisted synthesis of cyclodextrin polyurethanes

Biswas

Appell

Liu

et al. 2015

Carbohydrate Polymers

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Section: Thermogravimetric Analysis (Tga)supporting

confidence: 87%

Microwave-assisted synthesis of cyclodextrin polyurethanes

Biswas

Appell

Liu

et al. 2015

Carbohydrate Polymers

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“…The FT-IR spectra of linear and crosslinked polyurethane samples show a broad and relatively symmetric peak at about 3,335 cm −1 due to the hydrogen bonded N-H stretching [22]. The distribution of the carbonyl peak indicates a degree of hydrogen-bonding of the urethane carbonyl group by interactions between different segments.…”

Section: Resultsmentioning

confidence: 97%

Novel quinoline-based polyurethane elastomers. The effect of the hard segment structure in properties enhancement

Oprea¹

2011

J Polym Res

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Polyurethane elastomers incorporating a quinoline moiety along their polymeric backbones and aliphatic, aromatic or heterocyclic crosslinkers have been synthesized and characterized. For this, NCO-terminated urethane oligomers were prepared from poly(butylene adipate) diol and methylene diphenyl diisocyanate and were subsequently chain extended with 2,4-quinolinediol and different crosslinkers. This study reports the influence of the different crosslinker chemical structures and the hard segment molar ratio on the thermal and dynamic mechanical thermal properties, as well as on the mechanical properties of these elastomers. The fluorescence spectra of polyurethane elastomers were determined at an excitation wavelength of 290 nm. The different chemical structures of the crosslinkers determine the hard segment cohesion and reduce the mobility of the soft phase, having an important effect on thermal stability and on the mechanical properties of the polyurethane films. Thus the incorporation of aromatic crosslinkers results in polyurethanes with lower elongation and stress at break. The highest mechanical properties were obtained for polyurethanes crosslinked with aliphatic crosslinkers.

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“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] Thermal insulation property is mainly determined by the types of blowing agent added in the system. Trichlorofluoromethane (CFC) and HCFC-141b have offered the rigid PUF a good thermal insulation as blowing agents.…”

Section: Introductionmentioning

confidence: 99%

Effects of silicone surfactant on the cell size and thermal conductivity of rigid polyurethane foams by environmentally friendly blowing agents

Han¹,

Choi²,

Kim³

et al. 2009

Macromol. Res.

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Rigid polyurethane foams (PUF)s were synthesized with environmentally friendly blowing agents such as a cyclopentane/distilled water (10.0/1.0, pphp) mixture and distilled water only for four different silicone surfactants having different silicone/polyether ratios. An attempt was made to reduce the thermal conductivities of the PUF samples by varying the concentration and the silicone/polyether ratio of the various silicone surfactants. The scanning electron microscopy (SEM) results indicated an optimum concentration of the silicone surfactant of about 1.5 to 2.5 phpp for various surfactants to reduce the cell size and lower the thermal conductivity. The silicone surfactant having a higher silicone/polymer ratio showed a smaller cell size and, therefore, demonstrated the lower thermal conductivity of the PUF samples. From the relation between the thermal conductivity and the cell size of the PUF samples, the smaller cell size improved the thermal insulation property of the rigid PUF for both the PUF samples blown by the cyclopentane/distilled water (10.0/1.0, pphp) mixture and distilled water only. If the blowing agent is fixed, then the cell size is an important factor to decrease the thermal conductivity of the PUF samples. These results indicated that rigid PUF samples having lower thermal conductivity can be obtained by choosing a silicone surfactant containing a higher silicone/polyether ratio, as well as an optimum content of the surfactant.

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Synthesis and characterization of novel polyurethanes based on 4-{(4-hydroxyphenyl)iminomethyl}phenol

Cited by 54 publications

References 35 publications

Microwave-assisted synthesis of cyclodextrin polyurethanes

Microwave-assisted synthesis of cyclodextrin polyurethanes

Novel quinoline-based polyurethane elastomers. The effect of the hard segment structure in properties enhancement

Effects of silicone surfactant on the cell size and thermal conductivity of rigid polyurethane foams by environmentally friendly blowing agents

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