Effect of the crosslink density on the morphology and properties of reaction‐injection‐molding poly(urethane urea) elastomers

Li, Zaifeng; Yang, Guanghua; Chen, Xu

doi:10.1002/pola.11077

Cited by 8 publications

(3 citation statements)

References 13 publications

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“…As well known, the crosslinked structures of a resin had a great influence on its properties 7–10. Investigation on the effect of the molecular structure and crosslinking character of a crosslinked network on properties would give an effective guide for the design and preparation of a new crosslinkable resin.…”

Section: Introductionmentioning

confidence: 99%

The preparation and characterization of crosslinked polytriazoles with different network grids

Xiaofei

Wan

Yanpeng

et al. 2010

J of Applied Polymer Sci

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Crosslinked structures of a resin had a great influence on its properties. Studying the effect of a crosslinked network on resin properties will benefit to design and prepare a new resin with good performances. A series of alkyne group-capped oligomers were designed and well characterized. The corresponding crosslinked polytriazoles with different network grids were obtained when multifunctional azide monomer was used as a crosslinking agent. The glass transition temperature (T g ) of the crosslinked polytriazoles was measured by Differential Scanning Calorimetry. The results showed networks with a small grid size would exihibit high T g s. The relationship between T g and the size of the network grids of the crosslinked polytriazoles was discussed.

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Section: Introductionmentioning

confidence: 99%

The preparation and characterization of crosslinked polytriazoles with different network grids

Xiaofei

Wan

Yanpeng

et al. 2010

J of Applied Polymer Sci

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show abstract

“…The component A (prepolymer) was prepared by the reaction of PTMG (50 g) containing some chemical crosslink agent (TMP, 2.25 g) with TDI 39.25 g [8] for 3 h at 80uC. The component B is a mixture of aromatic amine extender (3,5-dithio-2,4/2,6-diaminetoluene) 16.0 g, DBTDL 0.0518 g and PTMG 50 g. The prepolymer and component B were maintained at 65uC and 35uC, respectively.…”

Section: Preparation Of the Reaction Mixture For In Situ Ftirmentioning

confidence: 99%

Investigation of kinetics and morphology development for polyurethane-urea extended by DMTDA

Sun

et al. 2008

Front. Mater. Sci. China

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The relationship between the reactions kinetics and morphology development during the polyurethaneurea (PUU) curing process has been investigated simultaneously by in situ Fourier transform infrared spectroscopy (FTIR). The data of the FTIR spectra showed that with the increase of conversion, the absorbance of NH bands increases and its band sites shifts to lower wavenumbers; the absorbance of free urethane carbonyl kept nearly constant at low conversion, and then decreased much because of the interaction of the formed urea links, and then changed little at high conversion owing to the diffuse control. The band sites of hydrogen bonded urea carbonyl similarly shifted to lower wavenumbers and the absorbance of the hydrogen bonded urea carbonyl, associated with the phase separation of hard segments, became stronger with buildup of hydrogen bond between urea links. The carbonyl bands available during curing process were further assigned. Both interactions, such as hydrogenised effect and phase separation, played a major role in the matrix formation of the PUU polymer.

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“…The stoichiometric ratio of the RIM machine, defined as the weight ratio of components A to B, was held constant at 1.03. The prepolymer component A was prepared by the reaction of PTMG with TDI [11], in which PTMG contained some chemical crosslink agent TMP. The B-side is a mixture of aromatic amine extender (3,5-dithio-2,4/2,6-diaminetoluene), T-12 catalyst and PTMG.…”

Section: Rim and Puu Preparation Of Elastomersmentioning

confidence: 99%

Investigation of effects of dibutyltin dilaurate on reaction injection molding polyurethane-urea kinetics, morphology and mechanical properties by in situ FTIR

Yuan

et al. 2008

Front. Mater. Sci. China

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The bulk catalyst effect of dibutyltin dilaurate (DBTDL) on the reaction of NCO respectively with OH and NH 2 was investigated in detail. The results showed that DBTDL had specific catalyst effect on the reaction of NCO with OH and no measurable effect on the reaction of NCO with NH 2 . In situ Fourier transform infrared spectroscopy (FTIR) used in the reaction injection molding (RIM) process showed that with increasing the concentration of DBTDL, the formation rate of the soft segment became fast, and the order degree of urea carbonyls became worse. Meanwhile, more arrange manners of urea carbonyl were present. The bands at 1653, 1647 and 1637 cm 21 were able to be detected at the low conversion. No hydrogen-bonded urea carbonyl available in the spectra at the beginning. The tensile-stress behavior showed that, with the increase of the DBTDL content, the interaction between polar groups became weak, while the virtual crosslinks also became weak. Although the break stress (d), 300%d and the hardness of elastomers decreased obviously, however, the tear strength, associated with the morphology of polyurethane-urea (PUU), showed the maximum when the DBTDL content was 2.63ø.

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Effect of the crosslink density on the morphology and properties of reaction‐injection‐molding poly(urethane urea) elastomers

Cited by 8 publications

References 13 publications

The preparation and characterization of crosslinked polytriazoles with different network grids

The preparation and characterization of crosslinked polytriazoles with different network grids

Investigation of kinetics and morphology development for polyurethane-urea extended by DMTDA

Investigation of effects of dibutyltin dilaurate on reaction injection molding polyurethane-urea kinetics, morphology and mechanical properties by in situ FTIR

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